TiB2/WC/h-BN自润滑陶瓷材料的制备及力学性能

通过添加固体润滑剂h-BN,采用真空热压烧结工艺制备TiB2/WC/h-BN自润滑陶瓷材料,对其密度和力学性能进行测试,并采用XRD和SEM对材料的物相和显微结构进行分析.结果表明：TiB2/WC/h-BN自润滑陶瓷材料的相对密度为97.5％,抗弯强度、断裂韧性和维氏硬度分别为652MPa、4.5MPa·m1/2和14.8GPa.片状结构的固体润滑剂h-BN颗粒保存完整,分布均匀,而且可有效抑制基体TiB2晶粒的长大.材料的断裂模式是穿晶/沿晶断裂的混合型,以穿晶断裂为主.材料的增韧机理以裂纹偏转和裂纹桥联为主.TiB2/WC/h-BN自润滑陶瓷材料的摩擦因数低于0.3,与其他添加h-BN的自...

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Bibliographic Details
Published in材料工程 no. 4; pp. 63 - 67
Main Author 徐秀国 许崇海 方斌 王春林 衣明东
Format Journal Article
LanguageChinese
Published 齐鲁工业大学机械与汽车工程学院,济南250353 2014
齐鲁工业大学山东省高校轻工装备先进制造与测控技术重点实验室,济南250353%齐鲁工业大学机械与汽车工程学院,济南250353
齐鲁工业大学山东省高校轻工装备先进制造与测控技术重点实验室,济南250353
山东大学机械工程学院,济南250061%山东大学机械工程学院,济南,250061
Subjects
二硼化钛
力学性能
自润滑
陶瓷材料
自润滑
力学性能
titanium diboride
陶瓷材料
二硼化钛
ceramic material
mechanical property
self-lubricating
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Summary:通过添加固体润滑剂h-BN,采用真空热压烧结工艺制备TiB2/WC/h-BN自润滑陶瓷材料,对其密度和力学性能进行测试,并采用XRD和SEM对材料的物相和显微结构进行分析.结果表明：TiB2/WC/h-BN自润滑陶瓷材料的相对密度为97.5％,抗弯强度、断裂韧性和维氏硬度分别为652MPa、4.5MPa·m1/2和14.8GPa.片状结构的固体润滑剂h-BN颗粒保存完整,分布均匀,而且可有效抑制基体TiB2晶粒的长大.材料的断裂模式是穿晶/沿晶断裂的混合型,以穿晶断裂为主.材料的增韧机理以裂纹偏转和裂纹桥联为主.TiB2/WC/h-BN自润滑陶瓷材料的摩擦因数低于0.3,与其他添加h-BN的自润滑陶瓷材料相比,具有良好的力学性能和摩擦性能.
Bibliography:11-1800/TB
TiB2/WC/h-BN self-lubricating ceramic material with the addition of solid lubricant h-BN was prepared with vacuum hot-pressing sintering technique.Mechanical properties and density were tested.The phase and microstructure of the material were analyzed by X-ray diffraction and SEM.The results show that the relative density of TiB2/WC/h-BN self-lubricating ceramic material is 97.5％,and its flexural strength,fracture toughness and Vickers hardness are 652MPa,4.5MPa · m1/2 and 14.8GPa,respectively.Solid lubricant h-BN particles with flake structure are intact and uniformly distribute.It can effectively inhibit the growth of TiB2 matrix grains.The fracture of the material belongs to the mixture of transgranular/intragranular mode but mainly transgranular fracture.The toughening mechanisms are mainly crack bridging and crack deflection.The friction coefficient of TiB2/WC/h-BN self-lubricating ceramic material is lower than 0.3.Compared with the other self-lubricating ceramic materials added h-BN,TiB2/WC/h
ISSN:1001-4381
1001-4381
DOI:10.3969/j.issn.1001-4381.2014.04.011