Study on Mechanical Properties of Multi-Scale and Multi-Phase Nanocomposite Ceramic Tool Materials

The single nano-scale and multi-phase nanocomposite ceramic materials including Al2O3/Al2O3n/SiCn and Al2O3/Ti(C0.7N0.3)n/SiCn are successfully fabricated. Their mechanical properties are better than those of the single-phase alumina material and conventional alumina matrix materials. The multi-scale and single-phase nanocomposite ceramic tool material Al2O3/SiCμ/SiCn is also successfully fabricated. Its flexural strength and fracture toughness is higher than those of single-scale materials Al2O3/SiCμ and Al2O3/SiCn. The multi-scale and multi-phase nanocomposite ceramic tool material Al2O3/TiCμ/TiNn is finally developed by incorporation and dispersion of micro-scale TiC particle and nano-scale TiN particle in alumina matrix, which can get higher flexural strength and fracture toughness than those of Al2O3/TiC ceramic tool material without nano-scale TiN particle. The coexistent function of nano-scale Al2O3 or Ti(C0.7N0.3), nano-scale SiC and TiN can reduce the sintering temperature and sintering duration time as well as the grain size, and improve the material densification and mechanical properties. The nano-scale SiC grains locating along the grain boundary and inside the micro-scale alumina can form the hybria intergranular-intragranular microstructure which can result in hybria intergranular-transgranular fracture and improve the mechanical properties of the ceramic material. Crack deflection, forking and bridging effects are the main cause for improving the fracture toughness of the materials including Al2O3/Ti(C0.7N0.3)n/SiCn and Al2O3/TiCμ/TiNn.

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Study on the Multi-Phase and Multi-Scale Nanocomposite Ceramic Tool Material

Materials Science Forum ◽

10.4028/www.scientific.net/msf.532-533.245 ◽

2006 ◽

Vol 532-533 ◽

pp. 245-248 ◽

Cited By ~ 1

Author(s):

Han Lian Liu ◽

Chuan Zhen Huang ◽

Jun Wang ◽

Xin Ying Teng

Keyword(s):

Fracture Toughness ◽

Flexural Strength ◽

Tool Material ◽

Particle Dispersion ◽

Micro Scale ◽

Multi Scale ◽

Nano Scale ◽

Ceramic Tool Material ◽

Tic Particle ◽

Multi Phase

An advanced ceramic cutting tool material Al2O3/TiC/TiN is developed by means of adding micro-scale TiC particle and nano-scale TiN particle dispersion. With an optimal dispersing and fabricating technology, this multi-scale and multi-phase nanocomposite may get both higher flexural strength and fracture toughness, especially the fracture toughness may reach to 7.8 MPa·m1/2. The micro-scale TiC particle will form the framework microstructure with other particle and the particles will inlay each other. That is why the flexural strength of Al2O3/TiC composite is improved. Another phase such as nano-scale TiN may lead to fining the grains further more, and promote the sintering to get higher density. The uniform and densified microstructure is obtained, the coexisting transgranular and intergranular fracture mode induced by micro-scale TiC and nano-scale TiN can result in remarkable strengthening and toughening effect.

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New Thought for Designing the Multi-Phase and Multi-Scale Nanocomposite Ceramic Tool Materials

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.359-360.329 ◽

2007 ◽

Vol 359-360 ◽

pp. 329-334 ◽

Cited By ~ 5

Author(s):

Han Lian Liu ◽

Chuan Zhen Huang ◽

Xin Ying Teng ◽

Hui Wang

Keyword(s):

Mechanical Properties ◽

Tool Material ◽

Ceramic Tool ◽

New Thought ◽

Multi Scale ◽

Nano Scale ◽

The Matrix ◽

Scale Particle ◽

Multi Phase ◽

The Ideal

The new thought for designing the multi-phase and multi-scale nanocomposites was proposed to improve the comprehensive mechanical properties. Multi-phase and multi-scale particles are added to the matrix, and one of the additives is nano-scale particle, thus the comprehensive mechanical properties can be improved by the synergic effects of micro-scale toughening, nano-scale strengthening and mutual benefit between multi-phases. The ideal microstructure of multi-phase and multi-scale nanocomposites was designed. With this microstructure, the trans/intergranular fracture modes can be formed, which will consume more fracture energy during the crack propagation, therefore, both the flexural strength and fracture toughness can be improved. An advanced ceramic tool material has been fabricated based on this new thought.

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Effects of Nano-Al2O3 on the Mechanical Property and Microstructure of Nano-Micro Composite Self-Lubricating Ceramic Tool Material

Materials Science Forum ◽

10.4028/www.scientific.net/msf.770.308 ◽

2013 ◽

Vol 770 ◽

pp. 308-311 ◽

Cited By ~ 1

Author(s):

Ming Dong Yi ◽

Chong Hai Xu ◽

Zhao Qiang Chen ◽

Guang Yong Wu

Keyword(s):

Mechanical Properties ◽

Mechanical Property ◽

Fracture Toughness ◽

Flexural Strength ◽

Tool Material ◽

Ceramic Tool ◽

Ceramic Tool Material ◽

Composite Self ◽

Microstructure And Mechanical Property ◽

Grain Refinement Strengthening

A new nanomicro composite self-lubricating ceramic tool material was prepared with vacuum hot pressing technique. The effect of nanoAl2O3 powders on the microstructure and mechanical properties of nanomicro composite self-lubricating ceramic tool material was investigated. With the increase of nanoAl2O3 content, the hardness and fracture toughness first up then down. When the nanoAl2O3 content is 4 vol.%, the flexural strength, hardness and fracture toughness reaches 562 MPa, 8.46 MPa·m1/2 and 18.95 GPa, respectively. The microstructure and mechanical property of nanomicro composite self-lubricating ceramic tool material can be improved by the grain refinement strengthening of nanoAl2O3.

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.431-432.523 ◽

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.

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Microstructure Simulation and Toughening Mechanism of Ceramic Tool Material

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.335-336.688 ◽

2011 ◽

Vol 335-336 ◽

pp. 688-694

Author(s):

Xiao Hui Zhu ◽

Chuan Zhen Huang ◽

Han Lian Liu ◽

Bin Zou ◽

Hong Tao Zhu

Keyword(s):

Mechanical Properties ◽

Single Phase ◽

Three Dimensional ◽

Tool Material ◽

Ceramic Tool ◽

Toughening Mechanism ◽

C Language ◽

Finite Element Software ◽

Microstructure Simulation ◽

Ceramic Tool Material

Based on the microstructure results of Monte Carlo simulation, a three-dimensional grid model is built up, and imported into the finite element software with C++ language to analyze the mechanical properties of ceramic tool material. The stress field and residual stress of single-phase and multiphase ceramics have been analyzed by the computer simulation technology.

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