Microstructure and Mechanical Properties of two Kinds of Al2O3/SiC Nanocomposites

2004 ◽  
Vol 471-472 ◽  
pp. 243-247 ◽  
Author(s):  
Han Lian Liu ◽  
Chuan Zhen Huang ◽  
Jun Wang ◽  
Jing Sun
Keyword(s):  
Mechanical Properties ◽  
Alumina Powder ◽  
Transgranular Fracture ◽  
Alumina Ceramics ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Micro Scale ◽  
Nano Scale ◽  
Monolithic Alumina ◽  
Al2o3 Matrix

Two kinds of Al2O3 /SiC nanocomposites with different alumina powder are developed, one is fabricated only by nano-scale alumina powders, the other is by micro-scale with partial nano-scale alumina powders. Both of the two composites may get higher flexural strength and fracture toughness than that of micro-scale monolithic alumina ceramics, but the latter is more preferable than the former. The microstructure and the strengthening and toughening mechanisms of the new ceramic tool materials are investigated, the improvement of mechanical properties may be mainly attributed to the transgranular fracture mode induced by the added nano-scale SiC, while adding nano-scale alumina powder to micro-scale powder, both of the nano-scale Al2O3 and nano-scale SiC may strengthen the micro-scale Al2O3 matrix, that means the nano-scale Al2O3 acted as the dispersed phase.

Microstructure and Mechanical Properties of Multi-Scale Titanium Diboride Matrix Nanocomposite Ceramic Tool Materials

2010 ◽  
Vol 431-432 ◽  
pp. 523-526
Author(s):  
Han Lian Liu ◽  
Chuan Zhen Huang ◽  
Shou Rong Xiao ◽  
Hui Wang ◽  
Ming Hong
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Transgranular Fracture ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Micro Scale ◽  
Multi Scale ◽  
Nano Scale ◽  
Matrix Nanocomposite

Under the liquid-phase hot-pressing technique, the multi-scale titanium diboride matrix nanocomposite ceramic tool materials were fabricated by adding both micro-scale and nano-scale TiN particles into TiB2 with Ni and Mo as sintering aids. The effect of content of nano-scale TiN and sintering temperature on the microstructure and mechanical properties was studied. The result showed that flexural strength and fracture toughness of the composites increased first, and then decreased with an increase of the content of nano-scale TiN, while the Vickers hardness decreased with an increase of the content of nano-scale TiN. The optimal mechanical properties were flexural strength 742 MPa, fracture toughness 6.5 MPa•m1/2 and Vickers hardness 17GPa respectively. The intergranular and transgranular fracture mode were observed in the composites. The metal phase can cause ductility toughening and crack bridging, while crack deflection and transgranular fracture mode could be brought by micro-scale TiN and nano-scale TiN respectively.

Mechanical Properties of Al2O3-TiN Nanocomposite Ceramic Tool Materials

2012 ◽  
Vol 499 ◽  
pp. 108-113
Author(s):  
Yu Huan Fei ◽  
Chuan Zhen Huang ◽  
Han Lian Liu ◽  
Bin Zou
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Vickers Hardness ◽  
Sintering Temperature ◽  
Holding Time ◽  
Bending Test ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Nano Scale

Al2O3-TiN nanocomposite ceramic tool materials were fabricated by hot-pressing technique and the mechanical properties were measured. Mechanical properties such as room temperature flexural strength, Vickers hardness and fracture toughness were measured through three-point bending test and Vickers indentation. The effects of the content of nano-scale TiN, sintering temperature and holding time on the mechanical properties were investigated. The results shows that the addition of nano-scale TiN can improve the mechanical properties of alumina ceramics. Both the flexural strength and the fracture toughness first increased then decreased with an increment in the content of nano-scale TiN. Both the Vickers hardness and the fracture toughness increased with an increment in the sintering temperature. The flexural strength increased with an increment in the holding time, while the fracture toughness decreased with an increment in the holding time. The composites with only nano-scale TiN have the highest Vickers hardness for the holding time of 30min, while the hardness of the composites with nano-scale TiN and micro-scale TiN decreased with an increment in the holding time.

Effect of Nano-Additives on Microstructure and Mechanical Properties of Ti(C,N)-TiB2-WC Composite Ceramic Cutting Tool Materials

2013 ◽  
Vol 589-590 ◽  
pp. 337-341 ◽  
Author(s):  
Yue Liu ◽  
Chuan Zhen Huang ◽  
Han Lian Liu ◽  
Bin Zou ◽  
Peng Yao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cutting Tool ◽  
Composite Ceramic ◽  
Hot Press ◽  
Tool Materials ◽  
Micro Scale ◽  
Ceramic Cutting Tool ◽  
Nano Scale ◽  
Microstructure And Mechanical Properties ◽  
Cutting Tool Materials

Ti(C,N)-TiB2-WC composite ceramic cutting tool materials with nano-scale additives Ni and Mo, and micro-scale additives Ni and Mo as sintering aids were sintered respectively at a temperature of 1550 °C for holding time of 1hour in vacuum by a hot-press technique. The effects of nano-scale additives Ni and Mo, and micro-scale additives Ni and Mo on microstructure and mechanical properties of composites were compared and investigated. It is concluded that the wettability of nano-scale Ni and Mo to the composites is better than that of micro-scale Ni and Mo. The nano-scale whiskers were found in the composite ceramic tool materials with nano-scale additives. The addition of nano-scale Ni and Mo instead of micro-scale Ni and Mo could make the flexural strength and fracture toughness of Ti(C, N)-TiB2 –WC composites have a promotion, but could not make the hardness of the composites increase in this study.

Effect of Nano-Scale TiN on the Mechanical Properties and Microstructure of Si3N4 Based Ceramic Tool Materials

2006 ◽  
Vol 315-316 ◽  
pp. 154-158 ◽  
Author(s):  
Bin Zou ◽  
Chuan Zhen Huang ◽  
Jun Wang ◽  
Bing Qiang Liu
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Sintering Temperature ◽  
Ceramic Tool ◽  
Si3n4 Ceramic ◽  
Tool Materials ◽  
Nano Scale ◽  
Sintering Conditions ◽  
Si3n4 Matrix

An effect of nano-scale TiN grains on the mechanical properties and microstructure of Si3N4 based ceramic tool materials is investigated at the different sintering temperature. Compared to monolithic Si3N4 ceramic tool materials, the sintering temperature is decreased and mechanical properties is enhanced when only one percent of nano-scale TiN in term of mass is added into the Si3N4 matrix. The optimum mechanical properties are achieved when Si3N4/TiN nanocomposites tool materials were sintered at the sintering conditions of 1650, 30MPa and holding time of 40min. The flexural strength, fracture toughness and hardness are 1018.2MPa, 8.62MPa⋅m1/2 and 14.58GPa respectively. SEM micrographs indicate that microstructure is composed of the elongated and equiaxed β-Si3N4 grains, and some nano-scale TiN grains are enveloped into matrix grains.

Effect of Nano-Scale Al2O3 on Mechanical Properties of TiB2 Ceramic Tool Materials

2006 ◽  
Vol 315-316 ◽  
pp. 123-126 ◽  
Author(s):  
M.L. Gu ◽  
Chuan Zhen Huang ◽  
Jun Wang
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Relative Density ◽  
Al2o3 Content ◽  
Sintered Body ◽  
Ceramic Tool ◽  
Dispersion Phase ◽  
Tool Materials ◽  
Nano Scale

In this paper, a TiB2 composite with nano-scale Al2O3 as dispersion phase was hot-pressed at 1750. The effect of nano-scale Al2O3 on sinterability and mechanical properties of the TiB2 was investigated. The results show that the relative density of sintered body increases firstly and then decreases with the increasing of the Al2O3 content. When containing 10vol% nano-scale Al2O3, the composite with fine and uniform grains is obtained and the flexural strength reaches maximum. The nano-scale Al2O3 may agglomerate together when the Al2O3 content is up to 20vol%, which is harmful to the densification and mechanical properties of the composite.

Microstructure and Mechanical Properties of Nano-Scale Al2O3 Toughened Ti (C,N) Matrix Cermet Tool Materials

2006 ◽  
Vol 532-533 ◽  
pp. 37-40 ◽  
Author(s):  
Chuan Zhen Huang ◽  
Jun Wang ◽  
Li Qiang Xu ◽  
Sui Lian Wang ◽  
Han Lian Liu
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Vickers Hardness ◽  
Tool Material ◽  
Al2o3 Powder ◽  
Tool Materials ◽  
Micro Scale ◽  
Nano Scale ◽  
Microstructure And Mechanical Properties

Advanced Ti(C, N) matrix cermet tool materials with higher mechanical properties are successfully developed by dispersing nano-scale Al2O3 powder into the micro-scale Ti(C, N) matrix and Ni-Mo bonding phases powder. The effect of the content of nano-scale alumina on the microstructure and mechanical properties of micro-scale Ti(C, N) matrix cermet tool materials are investigated. The research results show that a type of Ti(C, N) matrix cermet tool material has the most optimal flexural strength of 900MPa, Vickers hardness of 17.4GPa and fracture toughness of 9.95MPa.m1/2 when the content of nano-scale alumina is 12% in term of mass. It is found from the microstructure analysis that the main reason of the mechanical properties improvement is the grain fining effect caused by nano-scale Al2O3.

Fabrication and Mechanical Properties of Homogenous and Graded Si3N4/(W, Ti)C Nano-Composite Ceramic Tool Materials

2014 ◽  
Vol 800-801 ◽  
pp. 511-515
Author(s):  
Xian Hua Tian ◽  
Jun Zhao ◽  
Shuai Liu ◽  
Zhao Chao Gong
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Composite Ceramic ◽  
Ceramic Tool ◽  
Graded Materials ◽  
Tool Materials ◽  
Graded Structure ◽  
Design Ideas ◽  
Novel Design

Close attention has been paid to Functional graded materials (FGMs) worldwide for their novel design ideas and outstanding properties. To verify the advantage of FGMS in the design of ceramic tool materials, Si3N4/(W, Ti)C nanocomposite ceramic tool materials with homogenous and graded structure were fabricated by hot pressing and sintering technology. The flexural strength, fracture toughness and hardness of the sintered composites were tested and compared. The experimental results showed that the graded structure improved mechanical properties of the ceramic tool materials, especially the flexural strength and fracture toughness. The introduction of residual compressive stress in the surface layer contributes to the improvement of the properties .

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