Mechanism and microstructural evolution of combustion synthesis of ZrB2–Al2O3 composite powders

2015 ◽  
Vol 41 (4) ◽  
pp. 5790-5797 ◽  
Author(s):  
G.Q. Xiao ◽  
Y.L. Fu ◽  
Z.W. Zhang ◽  
A.D. Hou
Keyword(s):  
Combustion Synthesis ◽  
Microstructural Evolution ◽  
Composite Powders ◽  
Al2o3 Composite

Combustion synthesis of AlB2-Al2O3 composite powders with AlB2 nanowire structures

2018 ◽  
Vol 5 (5) ◽  
pp. 055029
Author(s):  
Pan Yang ◽  
Guoqing Xiao ◽  
Donghai Ding ◽  
Yun Ren ◽  
Shoulei Yang ◽  
...  
Keyword(s):  
Combustion Synthesis ◽  
Composite Powders ◽  
Al2o3 Composite

Investigation of Microstructure and Property of Fe3Al/Al2O3 Composites

2010 ◽  
Vol 150-151 ◽  
pp. 1409-1412 ◽  
Author(s):  
Tao Jiang
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Sintering Process ◽  
Composite Powders ◽  
Al2o3 Composite ◽  
Al2o3 Phase ◽  
The Mean ◽  
Xrd Patterns ◽  
Al2o3 Matrix

The Fe3Al/Al2O3 composites were fabricated by pressureless sintering process. The Fe3Al intermetallics compounds powders were fabricated by mechanical alloying and heat treatment, then the Fe3Al powders and Al2O3 powders were mixed and the Fe3Al/Al2O3 composite powders were prepared, so the Fe3Al/Al2O3 composites were fabricated by sintering process at 1700oC for 2h. The phase composition and microstructure of Fe3Al intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition, microstructure and mechanical properties of the Fe3Al/Al2O3 composites sintered bulks were investigated. The XRD patterns results showed that there existed Fe3Al phase and Al2O3 phase in the sintered composites. The Fe3Al/Al2O3 composites 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 was about 3-5μm. The Fe3Al/Al2O3 composites exhibited more homogenous and compact microstructure with the increase of Fe3Al content in the Al2O3 matrix. The density and relative density of the Fe3Al/Al2O3 composites increased gradually with the increase of Fe3Al content. The fracture strength and fracture toughness of the Fe3Al/Al2O3 composites increased gradually with the increase of Fe3Al content. The elastic modulus and hardness (HRA) of the Fe3Al/Al2O3 composites decreased gradually with the increase of Fe3Al content.

Combustion synthesis of C/MgAl 2 O 4 composite powders using magnesium oxalate as carbon source

2018 ◽  
Vol 16 (3) ◽  
pp. 1253-1263 ◽  
Author(s):  
Lihua Lv ◽  
Guoqing Xiao ◽  
Donghai Ding ◽  
Yun Ren ◽  
Shoulei Yang ◽  
...  
Keyword(s):  
Carbon Source ◽  
Combustion Synthesis ◽  
Composite Powders ◽  
Magnesium Oxalate

An Investigation on the Mechanism of TiC+Al2O3 Combustion Synthesis via Mechanical Activation of Double Phases in TiO2-Al-C System

2008 ◽  
Vol 273-276 ◽  
pp. 210-215 ◽  
Author(s):  
Sayed Hamid Reza Fatemi Nayeri ◽  
Jalil Vahdati Khaki ◽  
Mohammad Reza Aboutalebi
Keyword(s):  
Mechanical Activation ◽  
Combustion Synthesis ◽  
Reaction Temperature ◽  
Synthesis Temperature ◽  
Synthesis Process ◽  
Third Phase ◽  
Transmission Electron ◽  
Al2o3 Composite ◽  
Composite Formation ◽  
Xrd Patterns

The starting reaction in the combustion synthesis process in TiO2-Al-C system leading to TiC+Al2O3 composite was evaluated using a combination of Differential Thermal Analysis (DTA), X-Ray Diffraction (XRD) and Transmission Electron Microscope (TEM). Double phases in 3TiO2- 4Al-3C system were milled separately and then the third phase was added according to the stoichiometric reaction for 3TiC+2Al2O3 composite formation. The combustion synthesis temperature was observed to decrease from 962 °C to 649 °C after mechanical activation of TiO2/Al mixture for 16 hr. On the contrary, the mechanical activation of Al/C and TiO2/C mixtures for 16 hr made the reaction temperature increase to 995 °C and 1024 °C, respectively. TEM and XRD patterns of as-milled powders showed that the reaction temperature changes could be due to increased TiO2 and Al interface area. In addition, DTA experiments showed that for the sample in which TiO2 and Al were mechanically activated the reaction occurred at the temperature even lower than the aluminum melting point.

Properties of ZrO2Al2O3 composite powders prepared from ZrAl metallo-organic compounds

1988 ◽  
Vol 100 (1-3) ◽  
pp. 413-417 ◽  
Author(s):  
Hideyuki Yoshimatsu ◽  
Tatsumi Yabuki ◽  
Hitoshi Kawasaki
Keyword(s):  
Organic Compounds ◽  
Composite Powders ◽  
Al2o3 Composite

In situ preparation of SiC/Si3N4-NW composite powders by combustion synthesis

2012 ◽  
Vol 38 (1) ◽  
pp. 487-493 ◽  
Author(s):  
Chao-Sheng Zheng ◽  
Qing-Zhi Yan ◽  
Min Xia ◽  
Chang-Chun Ge
Keyword(s):  
Combustion Synthesis ◽  
Composite Powders ◽  
In Situ Preparation

Understanding structural evolution of nanostructured Cu-Al2O3 composite powders during thermomechanical processing

Materialia ◽  
2018 ◽  
Vol 4 ◽  
pp. 268-275 ◽  
Author(s):  
Dengshan Zhou ◽  
Zakaria Quadir ◽  
Charlie Kong ◽  
Hucheng Pan ◽  
Zhuang Liu ◽  
...  
Keyword(s):  
Thermomechanical Processing ◽  
Structural Evolution ◽  
Composite Powders ◽  
Al2o3 Composite

Thermal Shock Properties of Ti(Al,O)/Al2O3 and TiAl(O)/Al2O3 Composite Coatings

2011 ◽  
Vol 275 ◽  
pp. 47-50
Author(s):  
Asma Salman ◽  
Brian Gabbitas ◽  
De Liang Zhang
Keyword(s):  
Thermal Shock ◽  
Tool Steel ◽  
Thermal Shock Resistance ◽  
Composite Coatings ◽  
Composite Powders ◽  
H13 Tool Steel ◽  
Al2o3 Composite ◽  
Shock Resistance ◽  
Shock Behaviour ◽  
Thermal Shock Behaviour

Ti(Al,O)/Al2O3 and TiAl(O)/Al2O3 composite coatings have a potential to reduce dissolution and aluminium soldering tendency of H13 tool steel used in the aluminium processing industry. The thermal shock resistance of H13 tool steel coated with Ti(Al,O)/Al2O3 and TiAl(O)/Al2O3 composite powders sprayed using a high velocity oxygen fuel (HVOF) technique was studied. The thermal shock behaviour of the composite coatings was investigated by subjecting the coated coupons to a number of cycles, each cycle consisting of a holding time of 30 seconds in molten aluminium at 700 ± 10 °C followed by quenching into water. The surfaces of the coupons were examined for Al soldering and an evaluation of surface spallation. Any cracks found in the coatings were studied to explain their thermal shock behaviour. The results of this study showed that both Ti(Al,O)/Al2O3 and TiAl(O)/Al2O3 composite coatings on H13 tool steel have good thermal shock resistance with a thermal shock life between 300 to 400 cycles. The composite coatings and fracture surfaces were analyzed using scanning electron microscopy.

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