A Hew Mechanical Activation assisted Self-Propagating High-Temperature Synthesis of Metal Carbide-Boride Composites

一种新的机械活化辅助自蔓延高温合成金属碳化物-硼化物复合材料

• 批准号: 14550797
• 负责人: TSUCHIDA Takeshi
• 金额: $ 2.24万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550797/
• 关键词: Mechanical Activation; Zirconium Carbide; Zirconium Boride; Composite; Self-Propagating High-Temperature Synthesis; Vickers Hardness; Fracture Toughness; 硼化ジルコニウ; 破壊靭性

Boride and carbide of zirconium show a number of excellent properties such as high melting temperature, high strength, high thermal and electrical conductivity, and chemical stability. Therefore, the use of these ceramics in composites can be expected to offer potential candidates for a variety of high-temperature structural applications. In order to prepare the powder mixtures of ZrB_2 and ZrC with fine, homogeneous microstructure, we have developed mechanical activation assisted self-propagating high-temperature synthesis (MA-SHS) in air, and successfully applied to the synthesis of carbides and nitrides of Al,Zr and Nb, and borocarbides of Al_3BC. When the powder mixtures of Zr/B/O=3/2/2〜6/10/1 in molar ratio were mechanically activated (MA) by ball milling and then exposed to air, they self-ignited spontaneously and the self-propagating high-temperature synthesis (SHS) was occurred to form ZrB_2 and ZrC simultaneously. In this MA-SHS process in air, it was found to be essential that graphite is converted into finely divided, disordered carbon by mechanical activation and mixed with the particles of Zr and B in an intimate contact state. In addition, the ZrB_2-ZrC composites were produced from these MA-SHS powder mixtures by spark plasma sintering (SPS) at 1800℃ and showed the values of Vickers hardness of 17.8 GPa for the MA-SHS powder compact of Zr/B/C=2/2/1 and fracture toughness of 5.1 MPa m^<1/2> for the one of Zr/B/C=4/6/1.

锆的硼化物和碳化物具有高熔点、高强度、高导热性、高导电性和化学稳定性等优良性能。因此，这些陶瓷在复合材料中的应用有望为各种高温结构应用提供潜在的候选材料。为了制备组织细小、均匀的ZrB_2和ZrC混合粉末，我们在空气中开发了机械活化辅助自蔓延高温合成（MA-SHS）技术，并成功地应用于Al、Zr和Nb的碳化物和氮化物以及Al_3BC的硼碳化物的合成。当Zr/B/O（摩尔比）=3/2/2 ~ 6/10/1的混合粉末经机械球磨活化后暴露于空气中时，它们发生自燃并发生自蔓延高温合成（SHS），同时生成ZrB 2和ZrC。在该空气中的MA-SHS工艺中，发现石墨通过机械活化转化为细碎的无序碳并与Zr和B的颗粒以紧密接触状态混合是必要的。此外，在1800℃下采用放电等离子烧结（SPS）技术制备了ZrB_2-ZrC复合材料，Zr/B/C=2/2/1的MA-SHS粉末压坯的维氏硬度为17.8 GPa，Zr/B/C=4/6/1的MA-SHS粉末压坯的断裂韧性为5.1 MPa m^<1/2>。

项目成果

Takeshi Tsuchida, Satoshi Yamamoto: "MA-SHS of ZrC and ZrB_2 in air from the Zr/B/C powder mixture"Key Engineering Materials. (in press).

Takeshi Tsuchida、Satoshi Yamamoto：“ZrC 和 ZrB_2 在空气中从 Zr/B/C 粉末混合物中的 MA-SHS”关键工程材料。

Takeshi Tsuchida, Satoshi Yamamoto: "Mechanical activation assisted self-propagating high-temperature synthesis of ZrC and ZrB_2 in air from the Zr/B/C powder mixtures"Journal of European Ceramic Society. (in press).

Takeshi Tsuchida、Satoshi Yamamoto：“机械活化辅助 Zr/B/C 粉末混合物在空气中自蔓延高温合成 ZrC 和 ZrB_2”欧洲陶瓷学会杂志。

Takeshi Tsuchida, Satoshi Yamamoto: "MA-SHS and SPS of ZrB_2-ZrC composites"Solid State Ionics. (in press).

Takeshi Tsuchida、Satoshi Yamamoto：“ZrB_2-ZrC 复合材料的 MA-SHS 和 SPS”固态离子学。

Takeshi Tsuchida, Satoshi Yamamoto: "Mechanical activation assisted self-propagating high-temperature synthesis of ZrC and ZrB_2 in air from the Zr/B/C powder mixtures"Journal of European Ceramic Society. 24. 45-51 (2004)

Takeshi Tsuchida、Satoshi Yamamoto：“机械活化辅助 Zr/B/C 粉末混合物在空气中自蔓延高温合成 ZrC 和 ZrB_2”欧洲陶瓷学会杂志。

Takeshi Tsuchida, Satoshi Yamamoto: "Mechanical activation assisted self-propagating high-temperature synthesis of ZrC and ZrB_2 in air from Zr/B/C powder mixtures"Journal of European Ceramic Society. 24. 45-51 (2004)

Takeshi Tsuchida、Satoshi Yamamoto：“机械活化辅助Zr/B/C粉末混合物在空气中自蔓延高温合成ZrC和ZrB_2”欧洲陶瓷学会杂志。