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首页> 外文期刊>日本セラミックス協会学術論文誌 >Mechanical and Electrical Properties of Strong TiB_2-B_4C Ceramic System by Hot-Pressing
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Mechanical and Electrical Properties of Strong TiB_2-B_4C Ceramic System by Hot-Pressing

机译：热压强TiB_2-B_4C陶瓷体系的机电性能

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摘要

TiB_2-B_4C ceramic composites containing no additives were hot-pressed from a mixture of TiB_2 and B_4C powders containing 0 up to 100 mol percent B_4C (20 mol percent). Hot-pressing was conducted at 1950 deg C for 3.6 ks under a pressure of 31.2 MPa in an Ar gas atmosphere. The mechanical and electrical properties were examined as a function of compositional change from TiB_2 to B_4C. TiB_2-B_4C composites containing 20-60 mol percent B_4C had a relative density of 97.4-98.9 percent, Vickers hardness of 23.8-27.2 GPa, flexural strength of 589-705 MPa, Young's modulus of 490-568 GPa, fracture toughness (K_(IC)) of 6.46-8.05 MPa centre dot m~(1/2). The mean surface roughness (R_a) was 25.6-30.5 nm and the electrical conductivity 0.30-3.96 MS centre dot m~(-1). Thus, these composites possessed a high electrical conductivity and a smooth surface. Their mechanical properties were 1.5 times higher than those of pure TiB_2 or B_4C ceramics, and comparable to those of SiAlON or hot-pressed Si_N_4 ceramics. The present composites are suitable as ceramic mold materials, machinable by electric discharge, corrosion-resistant electrode components, tool materials and high-temperature structural materials.
机译：将不含添加剂的TiB_2-B_4C陶瓷复合材料从TiB_2和B_4C粉末的混合物中热压，该粉末包含0至100摩尔百分比的B_4C（20摩尔百分比）。在Ar气氛中，在31.2 MPa的压力下于1950℃进行3.6 ks的热压。根据从TiB_2到B_4C的成分变化，检查了机械和电气性能。含20-60摩尔％B_4C的TiB_2-B_4C复合材料的相对密度为97.4-98.9％，维氏硬度为23.8-27.2 GPa，弯曲强度为589-705 MPa，杨氏模量为490-568 GPa，断裂韧性（K_（中心点m〜（1/2）为6.46-8.05 MPa。平均表面粗糙度（R_a）为25.6-30.5 nm，电导率为0.30-3.96 MS中心点m〜（-1）。因此，这些复合材料具有高电导率和光滑的表面。它们的机械性能是纯TiB_2或B_4C陶瓷的1.5倍，可与SiAlON或热压Si_N_4陶瓷相比。本发明的复合材料适合用作陶瓷模具材料，可通过放电加工，耐腐蚀电极组件，工具材料和高温结构材料。

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