亚微米级聚晶金刚石的高温高压合成

卢景瑞; 寇自力; 刘腾; 张雷雷; 丁未; 张强; 王强; 杨鸣; 龚红霞; 贺端威

doi:10.11858/gywlxb.20170574

亚微米级聚晶金刚石的高温高压合成

doi: 10.11858/gywlxb.20170574

四川大学原子与分子物理研究所，四川成都 610065

基金项目:

国家自然科学基金 11372143

详细信息

作者简介:
卢景瑞(1988—), 男，硕士研究生，主要从事高温高压下超硬材料的合成与物性研究. E-mail:lujingrui1988@163.com

通讯作者:
寇自力(1962—), 男，研究员，硕士生导师，主要从事高压下新材料的合成和新型超硬材料研究. E-mail:kouzili@scu.edu.cn

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出版历程
- 收稿日期: 2017-05-03
- 修回日期: 2017-05-09

Sub-Micron Polycrystalline Diamond Synthesis under High Temperature and High Pressure

Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China

摘要

摘要: 聚晶金刚石作为超硬材料具有很广泛的应用，常用于油气钻探、切削刀具、耐磨零件等领域。目前，工业上合成聚晶金刚石的内部晶粒尺寸一般都在微米量级以上，而合成微米级以下的聚晶金刚石则要面临很多困难。本工作使用熔渗法在高温高压的条件下合成了亚微米级聚晶金刚石，并对合成的样品进行了X射线衍射、扫描电子显微镜、电子背散射衍射、能谱、硬度等分析测试，结果表明：在5.5GPa、1500℃、保温15min的情况下成功合成了维氏硬度高达57.0GPa的亚微米级聚晶金刚石；分层组装的方法可以使Co均匀地分散在聚晶金刚石样品中，呈现出圆孔状，从而保证样品具备均匀、优异的性能。同时，通过对烧结工艺的探索发现，温度和保温时间在亚微米级聚晶金刚石的合成过程中起着非常重要的作用。
- 亚微米 /
- 合成 /
- 维氏硬度 /
- 高温高压 /
- 黏结剂 /
- 聚晶金刚石
Abstract: Due to its wide range of applications as a superhard material, polycrystalline diamond (PCD) has been used in oil-and gas-drilling, tool cutting, making of wear-resistant parts.At present, the average size of industrial synthetic PCD is above the micron dimension, but synthesizing the PCD with a size below the micron dimension remains a tough challenge.In this work, we succeeded synthesizing sub-micron polycrystalline diamond under high temperature and high pressure using the infiltrating technique.The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), electron backscatter diffraction (EBSD), energy dispersive spectrometer (EDS) and hardness test.These results show that the hardness of the PCD thus synthesized is 57.0GPa under 5.5GPa and 1500℃ when the hold time of temperature is 15min; that the Co can disperse uniformly in PCD as a round hole used the bi-layered assembly so that the PCD demonstrates uniform and excellent performance; and that it is found from its sintering process that the temperature and holding time play an important role in its synthetic process.
- sub-micron /
- synthesis /
- Vickers hardness /
- high temperature and high pressure /
- binder /
- polycrystalline diamond

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图 1 初始粉末的XRD图

Figure 1. XRD pattern of starting material

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图 2 初始粉末的SEM图

((a)0.5μm金刚石粉, (b)10μm金刚石粉)

Figure 2. SEM image of starting material

((a)0.5μm diamond powder, (b)10μm diamond powder)

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图 3 实验分层组装

Figure 3. Bi-layered assembly of experiment

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图 4 实验温压条件曲线

Figure 4. Temperature and pressure condition

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图 5 不同温度下合成PCD样品的维氏硬度

Figure 5. Vickers hardness of sintered PCD samples at different temperatures

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图 6 5.5GPa、1500℃下合成PCD样品的XRD图谱

Figure 6. XRD spectrum of sintered PCD at 5.5GPa and 1500℃

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图 7 合成PCD样品断面图

Figure 7. Fracture surface of the sintered PCD sample

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图 8 5.5GPa、1500℃下合成亚微米PCD样品经过酸处理后的SEM图

Figure 8. SEM image of sub-micron PCD sample sintered at 5.5GPa and 1500℃ after acid treatment

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图 9 5.5GPa、1500℃下合成亚微米PCD样品的EBSD图

Figure 9. EBSD image of sub-micron PCD sample sintered at 5.5GPa and 1500℃

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图 10 5.5GPa、1500℃下合成亚微米PCD样品EDS图

Figure 10. EDS image of sub-micron PCD sample sintered at 5.5GPa and 1500℃

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表 1 合成PCD样品的维氏硬度

Table 1. Vickers hardness of PCD samples

T/℃	t/min	H_v/GPa
T/℃	t/min	p=5.0GPa	p=5.5GPa
1300	5	15-22	15-22
1300	15	15-22	15-22
1400	5	53.03	32.14
1400	15	47.08	50.33
1450	5	19.22	18.36
1450	15	30.84	52.56
1500	5	21.22	42.97
1500	15	39.95	57.03
1550	5	23.40	39.14
1550	15	48.40	43.97

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表 2 5.5GPa、1500℃合成的亚微米PCD样品中各元素的含量

Table 2. Element content of sub-micron PCD sample at 5.5GPa and 1500℃

Element	w/%	χ/%
C (K)	77.70	92.80
O (K)	3.69	3.31
Co (K)	13.84	3.37
Mo (L)	2.08	0.31
W (M)	2.69	0.21

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