Fabrication and Mechanical Properties of Nano-Al2O3 Based Composite Ceramic Tool Material

2011 ◽  
Vol 335-336 ◽  
pp. 736-739
Author(s):  
Xing Li ◽  
Bin Fang ◽  
Xiu Guo Xu ◽  
Chong Hai Xu
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Tool Material ◽  
Composite Ceramic ◽  
Nano Particles ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Technique Effect ◽  
Nano Alumina ◽  
Ceramic Tool Material

The Al2O3(nm)/SiC（μm）/Al2O3（μm）ceramic tool materials were fabricated by the hot-pressing technique. Effect of the compositions on microstructure and mechanical properties is investigated. With nano-particles content decreasing, the flexural strength increased and fine grains can be obtained. When the nano-alumina content is 60wt%, the grain of this sample is fine, the Vickers hardness and flexural strength are 16.24 GPa and 678 MPa, respectively.

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

2013 ◽  
Vol 770 ◽  
pp. 308-311 ◽  
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.

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 .

A Study on the Mechanical Properties of Ti(C, N) Based Ceramic Tool Material

2004 ◽  
Vol 471-472 ◽  
pp. 369-373
Author(s):  
Sui Lian Wang ◽  
Li Qiang Xu ◽  
Chuan Zhen Huang ◽  
Han Lian Liu
Keyword(s):  
Mechanical Properties ◽  
Intergranular Fracture ◽  
Hot Pressing ◽  
Tool Material ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Main Fracture ◽  
Ceramic Tool Material ◽  
Fracture Morphologies ◽  
Pressing Technology

Ti(C, N) based ceramic tool materials in the Ti (C0.7N0.3)-(Ni-Co)-Cr3C2-VC system have been made by hot-pressing technology, their mechanical properties and fracture morphologies have been studied under three different fabrication conditions. The results show that the mechanical properties are significantly influenced by fabrication conditions, and the main fracture mode is intergranular fracture.

Compositional Design of Multiphase Composite Ceramic Tool Material Based on the Thermal Shock Resistance and Its Application

2004 ◽  
Vol 471-472 ◽  
pp. 21-25 ◽  
Author(s):  
Chong Hai Xu ◽  
Chuan Zhen Huang ◽  
Xing Ai
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Fracture Resistance ◽  
Tool Material ◽  
Composite Ceramic ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Ceramic Tool Material ◽  
Shock Resistance ◽  
Optimum Model

Thermal shock resistance is one of the primary properties for the ceramic cutting tool materials with perspectives in high speed machining. An optimum model for the compositional design of the composite ceramic tool materials is built based on the thermal shock resistance. The thermal stress fracture resistance factor R is used to characterize the thermal shock resistance of the ceramic material. Results show that the developed (W,Ti)C/SiC/Al2O3 multiphase ceramic tool material can be expected to achieve the highest thermal shock resistance when the volume fraction of (W,Ti)C and SiC is about 15.8% and 24.8%, respectively. Thermal fracture resistance of the (W,Ti)C/SiC/Al2O3 ceramic tool material is approximately 81-88% higher than that of the pure alumina ceramic when machining the hardened carbon steel, which coincides well with the theoretical prediction from the optimum model. It suggests that the method used here is feasible for the development of ceramic tool materials with designed thermal shock resistance.

Processing and Characterization of an Al2O3/TiCN Micro-Nano-Composite Graded Ceramic Tool Material

2012 ◽  
Vol 499 ◽  
pp. 132-137
Author(s):  
Z.J. Gao ◽  
Jun Zhao ◽  
Guang Ming Zheng
Keyword(s):  
Mechanical Properties ◽  
Tool Material ◽  
Nano Particles ◽  
Ceramic Tool ◽  
Nano Composite ◽  
The Core ◽  
Micro Particles ◽  
Ceramic Tool Material ◽  
Graded Ceramic Tool ◽  
Al2o3 Particles

In this study, an Al2O3-based functionally graded ceramic tool material reinforced with TiCN micro-particles and nano-Al2O3 particles was fabricated by using hot-pressing technique. The experimental results showed that optimal mechanical properties were achieved for the composite with the addition of nano-Al2O3 particles increasing from 10vol.% in the surface to 20vol.% in the core, with the flexural strength, fracture toughness and Vicker’s hardness being 1073MPa, 5.99MPa.m1/2 and 21.78GPa, respectively. The microstructure and phase composition of the composites were characterized with SEM, TEM and XRD. It is believed that addition of nano-Al2O3 increasing from the surface to the core, which developed an nano-particles-rich tougher core and a hard Al2O3/TiCN-rich surface, improved the integrated mechanical properties of micro-nano-composite graded ceramic material.

scholarly journals Cohesive Element Model for Fracture Behavior Analysis of Al2O3/Graphene Composite Ceramic Tool Material

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 669 ◽  
Author(s):  
Yongpeng Zhang ◽  
Guangchun Xiao ◽  
Chonghai Xu ◽  
Tingting Zhou ◽  
Mingdong Yi ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Single Phase ◽  
Average Energy ◽  
Tool Material ◽  
Composite Ceramic ◽  
Interface Strength ◽  
Ceramic Tool ◽  
Al2o3 Ceramic ◽  
Tool Materials ◽  
Ceramic Tool Material

The microstructure model of Al2O3/graphene (AG) composite ceramic tool material is established based on Voronoi tessellation. The cohesive element method was used to simulate the crack growth of AG. The effect of cohesive parameters at the grain boundary of Al2O3 and graphene on the crack propagation was investigated. The results show that the grain strength of graphene is too high, the crack propagation to graphene grains will be hindered and cannot propagate forward. Cracks tend to spread along the paths where the crack propagation drive force was high and the resistance was low. When the interface strength between Al2O3 and graphene was at the weak interface, the crack propagation path and length were relatively straight and short. The average energy release rate G C is 1.042 × 10−3 J/m2, which is 2.4% higher than that of single-phase Al2O3 ceramic tool materials. However, if the interface strength between Al2O3 and graphene was at the strong interface, the crack propagated along graphene particles for a short distance, consuming a large amount of fracture energy. Furthermore, the crack will deflect around graphene grains, which increases the crack propagation length. The average energy release rate G C is 1.039 × 10−3 J/m2, which is 2% higher than that of single-phase Al2O3 ceramic tool materials.

Study on the Microstructure and Mechanical Properties of TiB2-Ti(C,N) Composite Ceramic Tool Materials

2012 ◽  
Vol 426 ◽  
pp. 155-158 ◽  
Author(s):  
Lin Liu ◽  
Chuan Zhen Huang ◽  
Bin Zou ◽  
Liang Xu ◽  
H.L. Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Composite Ceramic ◽  
Fracture Pattern ◽  
Sintering Process ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Microstructure And Mechanical Properties ◽  
Hot Press Sintering

TiB2-Ti(C, N)-(Ni, Mo) composite ceramic tool materials were fabricated by the hot-press sintering technology. The effects of the content of Ti(C, N) on the microstructure and mechanical properties were investigated by XRD and SEM observations. It is shown that the grain size of the composites is small, the fracture surface is irregularity, the grain boundaries of TiB2 and Ti(C, N) are connected tightly, and a new crystalline phase of MoNi is formed. A small amount of Ti(C, N) is decomposed into TiN, and the decomposition of Ti(C, N) is intensified as the content of Ti(C, N) is increased during the sintering process. The fracture pattern is the combination of the intergranular mode and transgranular mode. It is found that the flexural strength and fracture toughness of TiB2-Ti(C, N)-(Ni, Mo) composites increase consistently owning to the addition of Ti(C, N), the maximum resultant mechanical properties of TiB2-Ti(C, N)-(Ni, Mo) composites are 1019.53MPa for the flexural strength, 6.89MPa•m1/2 for the fracture toughness and 23.65GPa for Vickers hardness.

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