B-C-N-Ti四元超硬复合材料的高压烧结

黄鸿东; 于晓辉; 贺端威

doi:10.11858/gywlxb.20240769

B-C-N-Ti四元超硬复合材料的高压烧结

doi: 10.11858/gywlxb.20240769

黄鸿东^1,,
于晓辉^2,*, ,,
贺端威^1,*, ,

1.
四川大学原子与分子物理研究所, 四川成都　610065
2.
中国科学院物理研究所, 北京　100190

基金项目: 国家重点研发计划（2023YFA1406200）

详细信息

作者简介:
黄鸿东（1997－），男，硕士研究生，主要从事高压下超硬材料的合成研究. E-mail：hongdonghuangsss@163.com

通讯作者:
于晓辉（1981－），男，博士，研究员，主要从事高压物理及材料研究. E-mail：yuxh@iphy.ac.cn

贺端威（1969－），男，博士，教授，主要从事高压物理、大腔体静高压技术以及超硬材料研究. E-mail：duanweihe@scu.edu.cn

中图分类号: O521.3; O521.2
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出版历程
- 收稿日期: 2024-03-29
- 修回日期: 2024-04-25
- 网络出版日期: 2024-07-08
- 刊出日期: 2024-07-25

High Pressure Sintering of B-C-N-Ti Quaternary Superhard Composites

HUANG Hongdong^1
,,
YU Xiaohui^{2,*
, ,},
HE Duanwei^{1,*
, ,}

1.
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, Sichuan, China
2.
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

摘要

摘要: 以金刚石、立方氮化硼（cBN）和钛（Ti）为初始材料，通过高温高压反应烧结制备了B-C-N-Ti四元超硬复合材料。结果表明：在高温高压下，Ti与金刚石及cBN反应生成TiC_0.7N_0.3和TiB₂；TiC_0.7N_0.3作为黏结相以键合金刚石和cBN晶粒，适量Ti的加入可以有效地提高烧结体的韧性；反应生成的TiC_0.7N_0.3和TiB₂等陶瓷相以及cBN对金刚石晶粒的包裹提高了烧结体的抗氧化性。当金刚石、cBN和Ti的摩尔比为2∶1∶0.10时，在压力为12 GPa、温度为2000℃、保温5 min的条件下得到的烧结样品性能较好，其维氏硬度达到 (49.0±1.2) GPa，韧性为(14.2±0.6) MPa·m^1/2，空气氛围下的起始氧化温度为921 ℃。
- 金刚石 /
- 立方氮化硼 /
- 钛 /
- 超硬复合材料 /
- 高温高压 /
- 烧结
Abstract: In this work, the B-C-N-Ti quaternary superhard composite was prepared by high pressure and high temperature sintering with diamond, cubic boron nitride (cBN) and titanium (Ti) as starting materials. The characterization results show that Ti reacts with diamond and cBN to form TiC_0.7N_0.3 and TiB₂ under high pressure and high temperature, which acts as the binding additives for diamond and cBN grains. The addition of appropriate amount of Ti can effectively improve the toughness of the sintered composite specimen. The formation of TiC_0.7N_0.3 and TiB₂ ceramics and cBN coated the diamond grains and greatly enhanced the oxidation ability. When the molar ratio of diamond, cBN and Ti is 2∶1∶0.10 and sintered at 12 GPa and 2000 ℃ for 5 min, the specimen exhibits the best performance with Vickers hardness of (49.0±1.2) GPa, fracture toughness of (14.2±0.6) MPa·m^1/2 and oxidation temperature of 921 ℃ under air condition.
- diamond /
- cBN /
- titanium /
- superhard composites /
- high pressure and high temperature /
- sintering

HTML全文

图 1 不同Ti含量下金刚石-Ti-cBN烧结样品（12 GPa、2000 ℃）的XRD谱

Figure 1. XRD patterns of diamond-Ti-cBN composites sintered at 12 GPa and 2000 ℃ with different contents of Ti

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图 2 金刚石-Ti-cBN烧结样品断裂面的SEM图像

Figure 2. SEM images of the fracture surfaces of diamond-Ti-cBN sintered composites

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图 3 BND₂Ti_0.10 的SEM图像以及B、C、N和 Ti 元素的EDS图谱

Figure 3. SEM image and the corresponding EDS mapping of B, C, N, and Ti element for BND₂Ti_0.10 specimen

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图 4 不同Ti含量的金刚石-Ti-cBN烧结样品的维氏硬度和韧性

Figure 4. Vickers hardness and fracture toughness of diamond-Ti-cBN specimens with different contents of Ti

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图 5 BND₂Ti_0.10 样品在49 N加载下的压痕SEM图像

Figure 5. SEM images of the Vickers hardness indentation for BND₂Ti_0.10 specimens at the applied load of 49 N

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图 6 空气氛围下加热至1400 ℃的BND₂Ti_0.10烧结样品的TG-DSC曲线

Figure 6. TG-DSC curve of BND₂Ti_0.10 specimen to 1400 ℃ under air condition

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