Synthesis and microstructure control of bride-nitride composite ceramics by solid-state displacement reaction

固相置换反应制备氮化物复合陶瓷及其微观结构控制

• 批准号: 11650691
• 负责人: TAIMATSU Hitoshi
• 金额: $ 1.79万
• 依托单位: Akita University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650691/
• 关键词: TiB_2; TiC; TiN; ZrB_2; ZrN; displacement reaction; reaction sintering; 固相置換反応; 固相反応; 超硬材料; ホウ化物; チッ化物

Reaction processes in the B_4C-Ti, BN-Ti and BN-Zr systems were examined for determining the most suitable reaction temperature and holding time for the syntheses of TiB_2-TiC-C, TiB_2-TiN and ZrB_2-ZrN composites with fine microstructure. For the TiB_2-TiC-C composites, their densification was tried by reactive hot pressing.For reactive hot pressing of powder mixtures of B_4C and Ti at 2000℃, different reaction products were formed by varying the Ti/B_4C mixing ratio x : B_4C-TiB_2-C at 0<x<2, TiB_2-C at x=2, TiB_2-TiC-C at 2<x<3 and TiB_2-TiC at x=3. Relative density had the minimum value 97.0% at x=2. Except for this mixing ratio, every sintered body was highly dense and had a relative density more than 98.4%.For the reaction between Ti and BN at 1100℃, TiB was first formed as an intermediate product and then TiB_2 was formed by the reaction between TiB and BN.N/Ti ratios of TiN_x in TiB_2-TiN composites were a little lower than those estimated from the mixing ratios. Because of this phenomenon, a little amount of BN always remained after reaction. The synthesis of a perfect TiB_2-TiN composite will need excessive addition of Ti.For the reaction between Zr and BN at 1100℃, the reaction ceased after a reaction time of 144 h. Syntheses in an Ar stream prefer to those in vacutun or in vacuumized capsule. The nonstoichiometry of ZrN_x decreased with the reaction time.

研究了B_4C-Ti、BN-Ti和BN-Zr体系中的反应过程，确定了合成具有精细微观结构的TiB_2-TiC-C、TiB_2-TiN和ZrB_2-ZrN复合材料的最合适的反应温度和保温时间。对于TiB_2-TiC-C复合材料，尝试通过反应热压使其致密化。对于B_4C和Ti粉末混合物在2000℃下的反应热压，通过改变Ti/B_4C混合比x：B_4C-TiB_2-C在0<x<2，TiB_2-C在x=2，TiB_2-TiC-C在2<x<3和 x=3 时的 TiB_2-TiC。相对密度在x=2时具有最小值97.0%。除此混合比外,各烧结体均致密,相对密度大于98.4%。Ti与BN在1100℃反应时,首先生成中间产物TiB,然后TiB与BN反应生成TiB_2。TiB_2-TiN复合材料中TiN_x的N/Ti比略低于混合比估计值。由于这种现象，反应后总是残留少量BN。合成完美的TiB_2-TiN复合材料需要过量添加Ti。对于Zr和BN在1100℃下的反应，反应在144 h后停止。在氩气流中的合成优于在真空或真空胶囊中的合成。 ZrN_x的非化学计量随反应时间的延长而降低。

项目成果

泰松斉: "B_4CとTiの反応性放電プラズマ焼結によるTi-B-C系複合体の合成"Journal of the Ceramic Society of Japan. 108,[8]. 747-752 (2000)

Hitoshi Yasumatsu：“通过B_4C和Ti的反应放电等离子体烧结合成Ti-B-C复合材料”日本陶瓷学会杂志108，[8]747-752（2000）。

Hitohsi Taimatsu: "Synthesis of Ti-B-C composites by reactive spark plasma sintering of B_4C and Ti"Journal of the Ceramic Society of Japan. 108-8. 747-752 (2000)

Hitohsi Taimatsu：“通过B_4C和Ti的反应放电等离子烧结合成Ti-B-C复合材料”日本陶瓷学会杂志。