Microstructure and toughening mechanisms of Al2O3/(W, Ti)C/graphene composite ceramic tool material

2018 ◽  
Vol 44 (12) ◽  
pp. 13538-13543 ◽  
Author(s):  
Enzhao Cui ◽  
Jun Zhao ◽  
Xuchao Wang ◽  
Jialin Sun ◽  
Xiantong Huang ◽  
...  
Keyword(s):  
Tool Material ◽  
Composite Ceramic ◽  
Ceramic Tool ◽  
Toughening Mechanisms ◽  
Graphene Composite ◽  
Ceramic Tool Material

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.

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.

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