TiC-TiB<sub>2</sub>细晶陶瓷凝固组织、断裂行为与原位增韧

赵忠民; 张龙; 宋义刚; 何建强

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TiC-TiB₂细晶陶瓷凝固组织、断裂行为与原位增韧
Solidification Microstructure,Fracture Behavior and In-Situ Toughening of TiC-TiB₂ Fine-grained Composite Ceramics
2011年31卷第11期页码：986-989
纸质出版日期： 2011 ，
DOI：

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[1]赵忠民,张龙,宋义刚,何建强.TiC-TiB_2细晶陶瓷凝固组织、断裂行为与原位增韧[J].特种铸造及有色合金,2011,31(11):986-989+993.

Zhao Zhongmin, Zhang Long, Song Yigang, et al. Solidification Microstructure,Fracture Behavior and In-Situ Toughening of TiC-TiB₂ Fine-grained Composite Ceramics[J]. Special Casting & Nonferrous Alloys, 2011,31(11):986-989.
[1]赵忠民,张龙,宋义刚,何建强.TiC-TiB_2细晶陶瓷凝固组织、断裂行为与原位增韧[J].特种铸造及有色合金,2011,31(11):986-989+993. DOI：

Zhao Zhongmin, Zhang Long, Song Yigang, et al. Solidification Microstructure,Fracture Behavior and In-Situ Toughening of TiC-TiB₂ Fine-grained Composite Ceramics[J]. Special Casting & Nonferrous Alloys, 2011,31(11):986-989. DOI：

摘要

通过采用超重力下燃烧合成制备TiC-TiB2细晶陶瓷

研究了陶瓷凝固组织与晶体生长特征

探讨了陶瓷显微组织与断裂行为、增韧机制的关系。XRD、FESEM与EDS分析表明

TiC-TiB2复合陶瓷基体主要由大量细小的TiB2片晶及分布其周围的形状不规则的TiC相构成

TiB2片晶的形成是因其小平面晶体生长特性所致

而不规则TiC的晶体形貌则是因非小平面晶体生长特性及高的生长速率所造成的。陶瓷相对密度、硬度（HV）、弯曲强度及断裂韧度分别为98.6%、21.8GPa、650MPa、12.5MPa·m1/2

并且陶瓷增韧是小尺寸TiB2片晶的裂纹偏转、裂纹桥接、片晶拔出及摩擦互锁原位增韧机制协同作用的结果。

Abstract

Solidification structure and crystal growth of the TiC-TiB2 fine-grained ceramics which was prepared by combustion synthesis under high gravity were investigated

and the relationship between microstructure and fracture behavior as well as toughening mechanism was analyzed by XRD（X-ray diffraction）

FESEM（field emission scanning electron microscope） and EDS（energy dispersive spectrometer）.The results show that the composite ceramics matrix is composed of a lot of fine TiB2 platelets and irregular TiC grain surrounded the TiB2 platelets.The formation of TiB2 platelets is resulted from faceted crystal growth while irregular TiC grains are the results of non-faceted crystal growth and high growth velocity.Relative density

Vickers hardness

bending strength and fracture toughness of the ceramics reach 98.6%

21.8 GPa

650MPa and 12.5 MPa·m1/2

respectively.Ceramic toughening mechanism is attributed to the co-operation of crack deflection

crack-bridging and pull-up by small-size TiB2 platelets and frictionally-interlocking in-situ toughening effects.

关键词

TiB2-TiC复合陶瓷快速凝固细晶组织断裂行为原位增韧

Keywords

TiC-TiB2 Composite CeramicsRapid SolidificationFine-grained MicrostructureFracture BehaviorIn-Situ Toughening

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TiC-TiB2细晶陶瓷凝固组织、断裂行为与原位增韧

Solidification Microstructure,Fracture Behavior and In-Situ Toughening of TiC-TiB2 Fine-grained Composite Ceramics

DOI：

摘要

Abstract

关键词

Keywords

references

TiC-TiB₂细晶陶瓷凝固组织、断裂行为与原位增韧

Solidification Microstructure,Fracture Behavior and In-Situ Toughening of TiC-TiB₂ Fine-grained Composite Ceramics