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Pressureless sintering and mechanical properties of titanium nitride-titanium diboride particulate ceramic composites.

机译：氮化钛-二硼化钛颗粒陶瓷复合材料的无压烧结和力学性能。

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摘要

Titanium nitride has an attractive combination of engineering properties such as high hardness, high melting point, high corrosion resistance, and good electrical and thermal conductivity. In spite of these properties, the use of titanium nitride as a bulk ceramics has received little attention due to its poor sinterability, sensitivity of bulk properties to the processing conditions and the need for pressure-assisted sintering.; The primary objective of this research was to develop a pressureless reaction sintering process for titanium nitride using boron carbide as an additive. The resultant ceramic is a composite consisting of titanium nitride and titanium diboride as the matrix and reinforcing particulate phase, respectively. The secondary objective was to determine the role of the titanium diboride formed during sintering on the mechanical properties of the composites.; The highest sintered density obtained with a boron carbide addition of 2 ∼ 4 wt.% and at a sintering temperature of 2000°C was 95.9% of the theoretical density. The highest flexural strength was 415 MPa, the fracture toughness was 3.19 MPa × m1/2 and hardness was 12.8 GPa were obtained for composites with 6 wt.% of boron carbide addition.
机译：氮化钛具有吸引人的工程性能，例如高硬度，高熔点，高耐腐蚀性以及良好的导电性和导热性。尽管具有这些特性，但由于其可烧结性差，块体特性对加工条件的敏感性以及需要压力辅助烧结的原因，氮化钛作为块体陶瓷的使用却很少受到关注。这项研究的主要目的是开发一种以碳化硼为添加剂的氮化钛无压反应烧结工艺。所得的陶瓷是由氮化钛和二硼化钛分别作为基质和增强颗粒相组成的复合材料。第二个目的是确定在烧结过程中形成的二硼化钛对复合材料机械性能的作用。在2000℃的烧结温度下，添加2〜4重量％的碳化硼，得到的最高烧结密度为理论密度的95.9％。对于添加了6重量％碳化硼的复合材料，其最高弯曲强度为415 MPa，断裂韧性为3.19 MPa×m 1/2 ，硬度为12.8 GPa。

著录项

  • 作者

    Wang, Kang.;

  • 作者单位

    Queen's University at Kingston (Canada).;

  • 授予单位 Queen's University at Kingston (Canada).;
  • 学科 Engineering Materials Science.
  • 学位 M.Sc.
  • 年度 2002
  • 页码 115 p.
  • 总页数 115
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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