Effect of cobalt particle morphology on the properties of polycrystalline diamond composite
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摘要: 选用类球形和晶须状的团聚钴粉（团聚粒度相近），外掺到金刚石微粉中，经过超高压高温（HPHT）合成聚晶金刚石复合片（PDC），研究钴粉形貌特征对PDC性能的影响。研究发现：2种形貌的钴粉在微观形状、孔隙度、磁性能、结晶性等物理特征方面具有显著差异；用其合成的PDC样品，在界面结合形态、界面WC异常长大情况、抗冲击强度、耐磨性等方面，差异明显，类球形钴粉合成的PDC明显比晶须状钴粉合成的PDC具有更好的综合性能。Abstract: Spherical and whisker-like cobalt particles were doped into the diamond powders to synthesize the PDC compacts under the HPHT conditions, to investigate the effect of their morphology on the properties of PDC. It was found that the two morphologies of cobalt powder have significant differences in physical characteristics, such as microstructure, porosity, magnetic properties, and crystallinity. When they were used to synthesize PDC samples, it was found that there were noticeable differences in interface bonding morphology, abnormal growth of interface WC, impact strength, and wear resistance. PDC synthesized with spherical cobalt powder had better comprehensive performance than PDC synthesized with whisker-like cobalt powder.
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Key words:
- PDC /
- cobalt powder morphology /
- wear resistance /
- impact resistance /
- metal binder
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图 2 PDC聚晶层的XRD图谱及其界面上X射线透射成像结果
Figure 2. XRD pattern of polycrystalline layer of PDC and X-ray transmission imaging results on its interface
图 3 PDC的聚晶层和WC硬质合金的SEM
Figure 3. SEM of polycrystalline layers of PDC and WC cemented carbide
图 6 PDC界面附近的能谱成分分布曲线
Figure 6. Energy spectrum composition distribution curve near PDC interface synthesized
图 7 外掺2种形貌钴粉对PDC耐磨性的影响
Figure 7. Effect of adding cobalt powder with two morphologies on wear resistance of PDC
表 1 冲击韧性试验
Table 1. Impact toughness test results
样品 冲击次数n1次 总冲击力 / J 30 J 40 J 50 J i1 10 10 3 850 i2 10 10 10 1 200 i3 10 10 10 1 200 i4 10 10 6 1 000 i5 10 10 7 1 050 i6 10 10 10 1 200 
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