Role of B2O3 and CaO in Al2O3 matrix composite: In-situ phases, density, hardness and wear resistance

被引：13

作者：

Kasar, Ashish K. ^{[1
]}

Watson, Kevin P. ^{[1
]}

D'Souza, Brian ^{[1
]}

Menezes, Pradeep L. ^{[1
]}

机构：

[1] Univ Nevada, Mech Engn, Reno, NV 89557 USA

来源：

TRIBOLOGY INTERNATIONAL | 2022年 / 172卷

基金：

美国国家航空航天局;

关键词：

Alumina; Aluminum borate; Friction; Wear; ALUMINUM BORATE WHISKER; TRIBOLOGICAL PROPERTIES; ELECTRONIC POLARIZABILITY; MECHANICAL-PROPERTIES; OPTICAL BASICITY; FABRICATION; MICROSTRUCTURE; LUBRICATION; CERAMICS; ENERGY;

D O I：

10.1016/j.triboint.2022.107588

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

A novel set of Al2O3-B2O3-CaO composites were manufactured using a cold press-sintering. The B2O3 content in the composites was varied from 5 to 20 wt% and 2 wt% CaO was added to the composites. Dry sliding tests were conducted against an alumina ball at 10-95% relative humidity. The presence of the in-situ formed aluminum borate in the composite enhanced the micro-hardness and wear resistance, whereas the humidity-sensitive alumina phase reduced friction. Furthermore, addition of CaO improved the relative density upto similar to 92% which also led to significant improvement in hardness and wear resistance. However, the friction was negatively affected. The mechanism for enhanced wear resistance is demonstrated by considering the crystal-chemical approach and polarization theory for the double oxide systems.

引用

页数：14

共 42 条

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