Investigation of Phase Composition and Microstructure of the B4C/BN Nanocomposite Powders and the B4C/BN Nanocomposites Sintered Bulks

2011 ◽  
Vol 328-330 ◽  
pp. 1572-1575
Author(s):  
Tao Jiang
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Chemical Reaction ◽  
Hot Pressing ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Composite Powders ◽  
Pressing Process ◽  
Xrd Patterns ◽  
Nanocomposite Powders

In this research, the B4C/BN nanocomposite powders were fabricated by chemical reaction and heat treatment process, then the B4C/BN nanocomposites bulks were fabricated by hot-pressing process. The B4C/BN nanocomposite powders were fabricated by chemical reaction at 550°C for 15h and heat treatment at 850°C for 6h. The B4C/BN nanocomposites bulks were fabricated by hot-pressing process at 1850°C for 1h under the pressure of 30MPa. In this research, the phase composition and microstructure of the B4C/BN nanocomposite powders produced by chemical reaction and heat treatment process were investigated. The phase composition and microstructure of the B4C/BN nanocomposites produced by hot-pressing process were investigated. The XRD patterns results showed that there existed the B4C phase and amorphous BN phase in the composite powders produced by chemical reaction and heat treatment, and the amorphous BN phase completely transformed into the h-BN phase by hot-pressing process. The XRD patterns results showed that there existed the B4C phase and h-BN phase in the composites sintered bulks. The microstructure of the synthesized B4C/BN composite powders showed that the B4C particles were surrounded with the amorphous BN nano-sized particles, the thickness of amorphous BN coated layer was about 300-500nm. The B4C/BN nanocomposites exhibited the homogenous and compact microstructure, and the nano-sized h-BN particles were homogenously distributed in the B4C matrix. The mean particles size of B4C matrix was about 2-3μm, the length of nano-sized h-BN particles was about 1-2μm and width of nano-sized h-BN particles was about 100-200nm. The B4C/BN nanocomposites bulks exhibited more homogenous and compact microstructure with the increase of h-BN content.

Investigation of Phase Composition and Microstructure of the FeAl Intermetallics Compounds Bulks Fabricated by Mechanical Alloying Process and Hot-Pressing Process

2011 ◽  
Vol 228-229 ◽  
pp. 899-904 ◽  
Author(s):  
Tao Jiang
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Hot Pressing ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
High Relative Density ◽  
Pressing Process ◽  
The Mean ◽  
Xrd Patterns

The FeAl intermetallics compounds bulks were fabricated by hot-pressing process. The FeAl intermetallics compounds powders were fabricated by mechanical alloying and heat treatment process. The phase composition and microstructure of the FeAl intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition and microstructure of the FeAl intermetallics compounds bulks fabricated by hot-pressing process were investigated. The XRD patterns results showed that the Fe-Al intermetallics compounds powders were fabricated by mechanical alloying for 60h. The FeAl intermetallics compounds powders were fabricated by heat treatment process at 800oC, 900oC and 1000oC. The microstructure showed that the mean particles sizes of the Fe-Al intermetallics compounds powders produced by mechanical alloying decreased remarkably with the increase of milling time. The microstructure showed that the mean particles size of the Fe-Al intermetallics compounds powders produced by mechanical alloying and heat treatment was rather fine and about 4-5μm. The FeAl intermetallics compounds bulks were fabricated by hot-pressing process at 1100oC for 2h under the pressure of 35MPa. The XRD patterns results showed that there existed the FeAl intermetallics compounds phase in sintered bulks. The FeAl intermetallics compounds bulks exhibited the homogenous and compact microstructure. The mean particles size of the FeAl intermetallics compounds was about 2-3μm. The FeAl intermetallics compounds bulks exhibited the high relative density. The FeAl intermetallics compounds bulks with the high relative density were fabricated by hot-pressing process.

Investigation of Fabrication and Microstructure of the Fe3Al/Al2O3 Composites by Hot-Pressing Process

2011 ◽  
Vol 695 ◽  
pp. 385-388
Author(s):  
Tao Jiang ◽  
Hai Yun Jin
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Hot Pressing ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Pressing Process ◽  
The Mean ◽  
Xrd Patterns

The Fe3Al/Al2O3composites were fabricated by hot-pressing process at 1300°C for 2h under the pressure of 35MPa, by using the Fe3Al intermetallics compounds powders fabricated by mechanical alloying and heat treatment. The phase composition and microstructure of the Fe3Al intermetallics compounds powders and Fe3Al/Al2O3composites were investigated. The XRD patterns results showed that the Fe-Al intermetallics compounds powders were prepared by mechanical alloying for 60h and heat treatment process at 800°C and 1000°C. The XRD patterns results showed that there existed Fe3Al phase and Al2O3phase in sintered composites. The Fe3Al/Al2O3composites exhibited homogenous and compact microstructure, the Fe3Al particles were homogenously distributed in Al2O3matrix. The mean particles size of Fe3Al was about 3-4μm and the mean particles size of Al2O3matrix was about 4-5μm.

Investigation of Microstructure Characterization and Machinability of the B4C/BN Nanocomposites Bulks Fabricated by Chemical Reaction Process and Hot-Pressing Process

2012 ◽  
Vol 476-478 ◽  
pp. 902-905
Author(s):  
Tao Jiang
Keyword(s):  
Mechanical Property ◽  
Chemical Reaction ◽  
Hot Pressing ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Weak Interface ◽  
High Mechanical Property ◽  
Pressing Process ◽  
Xrd Patterns ◽  
Nanocomposite Powders

The B4C/BN nanocomposites were fabricated by hot-pressing process in this research. The B4C/BN nanocomposite powders were fabricated by chemical reaction and heat treatment process. The B4C/BN nanocomposites sintered bulks were fabricated by hot-pressing process at 1850oC for 1h under the pressure of 30MPa. In this research, the phase composition, microstructure, mechanical property and machinability of the B4C/BN nanocomposites fabricated by hot-pressing process were investigated. The XRD patterns results showed that there existed the B4C phase and h-BN phase in hot-pressed B4C/BN composites. The microstructure of the B4C/BN nanocomposites was investigated by SEM and TEM. The SEM micrographs showed that the B4C/BN nanocomposites bulks exhibited the homogenous and compact microstructure, and the h-BN particles were homogenously distributed in the B4C matrix. The TEM micrographs showed that there existed the weak interface between the B4C matrix grains and h-BN particles, as well as the microcracks within the laminate structured h-BN particles. The mechanical property of the B4C/BN nanocomposites decreased gradually with the increase of h-BN content. The B4C/BN nanocomposites exhibited the high mechanical property. The machinability of B4C/BN nanocomposites increased gradually with the increase of h-BN content, the drilling rates of the B4C/BN nanocomposites increased gradually with the increase of h-BN content.

Investigation of Phase Composition and Microstructure of the B4C/BN Nanocomposite Powders Fabricated by Chemical Reaction and Heat Treatment Process

2011 ◽  
Vol 335-336 ◽  
pp. 195-198 ◽  
Author(s):  
Tao Jiang
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Chemical Reaction ◽  
Treatment Process ◽  
Treatment Temperature ◽  
Heat Treatment Process ◽  
Composite Powders ◽  
Heat Treated ◽  
Coated Layer ◽  
Nanocomposite Powders

The B4C/BN nanocomposite powders were fabricated by chemical reaction and heat treatment process in this research. The starting powders was composed of B4C powders, H3BO3and CO(NH2)2. The mixture powders were reacted at 550°C for 15h and heat treated at 850°C for 6h. So the B4C/BN nanocomposite powders were prepared by above process. In this research, the B4C/BN nanocomposite powders were heat treated at 850°C, 1300°C, 1500°C, 1750°C. The phase composition and microstructure of the B4C/BN nanocomposite powders fabricated by heat treatment at high temperature were investigated by XRD and TEM. The XRD patterns results showed that there existed the B4C phase and amorphous BN phase after chemical reaction at 550°C and heat treatment at 850°C. Then the amorphous BN phase gradually transformed into the hexagonal BN (h-BN) phase with the increase of heat treatment temperature from 1300°C to 1750°C. The amorphous BN phase completely transformed into the h-BN phase after the hot-pressing process at 1850°C. The IR spectrum results showed that there existed the B4C phase and BN phase in the produced composite powders and sintered bulks. The microstructure of the synthesized B4C/BN composite powders showed that the B4C particles were surrounded with the amorphous BN coated layer after the heat treatment at 850°C, then the amorphous BN coated layer gradually transformed into the nano-sized h-BN particles with the increase of heat treatment temperature. So the B4C/BN nanocomposite powders were fabricated by chemical reaction and heat treatment process.

Investigation of Microstructure and Mechanical Property of the Fe3Al/Al2O3 Composites Fabricated by Mechanical Alloying Process and Hot-Pressing Process

2011 ◽  
Vol 492 ◽  
pp. 102-106
Author(s):  
Tao Jiang ◽  
Xiao Ping Shi
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Hot Pressing ◽  
Composite Powders ◽  
Al Content ◽  
Pressing Process ◽  
The Mean ◽  
Xrd Patterns ◽  
Microstructure And Mechanical Property

The Fe3Al/Al2O3composites were fabricated by hot-pressing process in this research. The Fe3Al intermetallics compounds powders were fabricated by mechanical alloying and heat treatment, then the Fe3Al powders and Al2O3powders were mixed and the Fe3Al/Al2O3composite powders were prepared, so the Fe3Al/Al2O3composites were fabricated by hot-pressing process at 1300°C for 2h under the pressure of 35MPa. The phase composition and microstructure of the Fe3Al intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition, microstructure and mechanical properties of the Fe3Al/Al2O3composites sintered bulks were investigated. The XRD patterns results showed that there existed Fe3Al phase and Al2O3phase in the sintered composites. The Fe3Al/Al2O3composites sintered bulks exhibited the homogenous and compact microstructure, the Fe3Al particles were homogenously distributed in the Al2O3 matrix, the mean particles size of Fe3Al intermetallics compounds was about 3-4μm. The Fe3Al/Al2O3composites exhibited more homogenous and compact microstructure with the increase of Fe3Al content in the Al2O3matrix. The density and relative density of the Fe3Al/Al2O3composites increased gradually with the increase of Fe3Al content. The fracture strength and fracture toughness of the Fe3Al/Al2O3composites increased gradually with the increase of Fe3Al content. The elastic modulus and hardness (HRA) of the Fe3Al/Al2O3composites decreased gradually with the increase of Fe3Al content.

Investigation of Phase Composition and Microstructure of the FeAl/Al2O3 Composites Fabricated by Mechanical Alloying Process and Pressureless Sintering Process

2011 ◽  
Vol 239-242 ◽  
pp. 968-971
Author(s):  
Tao Jiang
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Treatment Process ◽  
Pressureless Sintering ◽  
Heat Treatment Process ◽  
Sintering Process ◽  
Composite Powders ◽  
The Mean ◽  
Xrd Patterns

The FeAl/Al2O3composites were fabricated by pressureless sintering process. The FeAl intermetallics compounds powders were fabricated by mechanical alloying and heat treatment process. The FeAl intermetallics compounds powders and Al2O3powders were mixed and the FeAl/Al2O3composite powders were prepared. The FeAl/Al2O3composites bulks were fabricated by pressureless sintering process at 1600°C for 2h. The phase composition and microstructure of FeAl intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition and microstructure of the FeAl/Al2O3composites sintered bulks were investigated. The XRD patterns results showed that the Fe-Al intermetallics compounds powders were fabricated by mechanical alloying for 60h. The FeAl intermetallics compounds powders were fabricated by heat treatment at 800°C, 900°C and 1000°C. The microstructure showed that the mean particles size of the FeAl intermetallics compounds powders produced by mechanical alloying and heat treatment process was rather fine and about 4-5μm. The XRD patterns results showed that there existed the FeAl phase and Al2O3phase in sintered composites. The FeAl/Al2O3composites bulks exhibited the homogenous and compact microstructure. The mean particles size of FeAl was about 4-5μm and the mean particles size of Al2O3was about 5-10μm. The density and relative density of the FeAl/Al2O3composites increased gradually with the increase of FeAl content.

Investigation of Phase Composition and Microstructure of the FeAl/Al2O3 Composites Fabricated by Mechanical Alloying and Plasma Active Sintering Process

2011 ◽  
Vol 284-286 ◽  
pp. 226-229
Author(s):  
Tao Jiang
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Sintering Process ◽  
Composite Powders ◽  
Feal Phase ◽  
The Mean ◽  
Xrd Patterns

The FeAl/Al2O3composites were fabricated by plasma active sintering process in this research. The FeAl intermetallics compounds powders were fabricated by mechanical alloying and heat treatment process. The FeAl intermetallics compounds powders and Al2O3powders were mixed and the FeAl/Al2O3composite powders were prepared. The FeAl/Al2O3composites bulks were fabricated by plasma active sintering process at 1200°C for 5min under the pressure of 30MPa. The phase composition and microstructure of the FeAl/Al2O3composites sintered bulks were investigated. The XRD patterns results showed that the Fe-Al intermetallics compounds powders were fabricated by mechanical alloying for 60h. The FeAl intermetallics compounds powders were fabricated by heat treatment at 800°C, 900°C and 1000°C. The microstructure showed that the mean particles size of the FeAl intermetallics compounds powders produced by mechanical alloying and heat treatment process was rather fine and about 4-5μm. The XRD patterns results showed that there existed the FeAl phase and Al2O3phase in the sintered composites. The FeAl/Al2O3composites sintered bulks exhibited the homogenous and compact microstructure. The microstructure of the FeAl/Al2O3composites became more compact and homogenous with the increase of FeAl content. The mean particles size of FeAl was about 2-3μm and the mean particles size of Al2O3was about 2-3μm. The density and relative density of the FeAl/Al2O3composites increased gradually with the increase of FeAl content.

Investigation of Phase Composition and Microstructure of the FeAl/Al2O3 Composites Fabricated by Mechanical Alloying and Hot-Pressing Process

2011 ◽  
Vol 311-313 ◽  
pp. 323-326
Author(s):  
Tao Jiang
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Hot Pressing ◽  
Composite Powders ◽  
Pressing Process ◽  
Feal Phase ◽  
The Mean ◽  
Xrd Patterns

The FeAl/Al2O3composites were fabricated by hot-pressing process in this research. The Fe-Al intermetallics compounds powders were fabricated by mechanical alloying and heat treatment. The FeAl powders and Al2O3powders were mixed and the FeAl/Al2O3composite powders were prepared. The FeAl/Al2O3composites bulks were fabricated by hot-pressing process at 1300°C for 2h under the pressure of 35MPa. The phase composition and microstructure of the FeAl intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition and microstructure of the FeAl/Al2O3composites produced by hot-pressing process were investigated. The XRD patterns results showed that the Fe-Al intermetallics compounds powders were fabricated by mechanical alloying for 60h. The FeAl intermetallics compounds powders were fabricated by heat treatment at 800°C, 900°C and 1000°C. The microstructure showed that the mean particles size of the FeAl intermetallics compounds powders produced by mechanical alloying and heat treatment was rather fine and about 4-5μm. The XRD patterns results showed that there existed FeAl phase and Al2O3phase in sintered composites. The FeAl/Al2O3composites bulks exhibited the homogenous and compact microstructure. The mean particles size of FeAl was about 4-5μm and the mean particles size of Al2O3was about 4-5μm. The microstructure of the FeAl/Al2O3composites became more homogenous and compact with the increase of FeAl content.

Investigation of Microstructure and Mechanical Property of the Machinable B4C/BN Composites Fabricated by Hot-Pressing Process

2011 ◽  
Vol 415-417 ◽  
pp. 335-338
Author(s):  
Tao Jiang
Keyword(s):  
Mechanical Property ◽  
Phase Composition ◽  
Chemical Reaction ◽  
Hot Pressing ◽  
Weak Interface ◽  
Pressing Process ◽  
Sem And Tem ◽  
Xrd Patterns ◽  
The Relationship ◽  
Microstructure And Mechanical Property

The B4C/BN composites were fabricated by hot-pressing process in this research. The B4C/BN composites included the B4C/BN microcomposites and the B4C/BN nanocomposites. The B4C/BN microcomposites were fabricated by hot-pressing process, and the B4C/BN nanocomposites were fabricated by chemical reaction and hot-pressing process. In this research, the phase composition, microstructure, mechanical property and machinability of the B4C/BN microcomposites and B4C/BN nanocomposites were investigated. The XRD patterns results showed that there existed B4C phase and h-BN phase in the hot-pressed composites. The microstructure of the B4C/BN composites was investigated by SEM and TEM. The B4C/BN microcomposites and the B4C/BN nanocomposites sintered bulks exhibited the homogenous and compact microstructure, and the h-BN particles were homogenously distributed in the B4C matrix. The mechanical property of the B4C/BN microcomposites and the B4C/BN nanocomposites decreased gradually with the increase of h-BN content. The mechanical property of the B4C/BN nanocomposites was remarkably improved in comparison with the B4C/BN microcomposites. The machinability of the B4C/BN microcomposites and the B4C/BN nanocomposites increased gradually with the increase of h-BN content, the drilling rates of the B4C/BN composites specimens increased gradually with the increase of h-BN content. The relationship between the microstructure and machinability of the B4C/BN composites was analyzed. The microstructure showed that the weak interface of B4C/BN and cleavage behavior of laminate structured h-BN particles remarkably improved the machinabilty of B4C/BN composites.

Fabrication and Microstructure of Fe-Al Intermetallic Compound Powders by Mechanical Alloying

2010 ◽  
Vol 658 ◽  
pp. 356-359
Author(s):  
Tao Jiang ◽  
Hai Yun Jin
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Intermetallic Compound ◽  
Mechanical Alloying ◽  
Treatment Process ◽  
Milling Time ◽  
Heat Treatment Process ◽  
The Mean ◽  
Xrd Patterns ◽  
Fe3al Intermetallic

The Fe-Al intermetallic compound powders were fabricated by mechanical alloying and heat treatment process. In this research, the phase composition and microstructure of the Fe-Al intermetallic compound powders produced by different milling time and heat treatment at 800oC and 1000oC were investigated. The XRD patterns results showed that the Fe-Al intermetallic compound powders were fabricated by mechanical alloying for 60h. After heat treatment at 800oC and 1000oC, the Fe-Al intermetallic compound powders transformed into the Fe3Al powders. With the increase of milling time, the mechanical alloying extent of Fe-Al intermetallic compound powders would be increased remarkably, and the particles sizes decreased remarkably. The microstructure showed that the mean particles size of the Fe-Al intermetallic compound powders after milling for 60h was rather fine and about 4-5μm. The microstructures showed that mean particles size of the Fe3Al intermetallic compound powders produced by heat treatment at 800oC and 1000oC was also about 4-5μm.

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