Research on Cr coating layer inhibiting oxidation of diamond in diamond/Al-borosilicate glass composites
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摘要: 为研究在镀铬金刚石/铝硼硅玻璃复合材料中Cr镀层对金刚石氧化反应的抑制作用，将不同镀层厚度的镀铬金刚石和铝硼硅玻璃在相同工艺下烧制成试样，检测试样的体积膨胀率和抗折强度，观察其断面形貌；同时分析烧结后金刚石单颗粒抗压强度和金刚石-结合剂界面的成分。结果表明：Cr镀层具有消耗和隔绝氧元素的双重保护作用，能有效抑制金刚石的氧化。同时，镀层厚度对金刚石氧化反应影响显著：镀层太薄，不能在高温烧结过程中持续保护金刚石；镀层太厚，会由于应力匹配问题产生裂纹或成片剥落，使金刚石暴露在有氧环境中，反而失去保护作用。对于粒度号为140/170的金刚石，最佳镀层厚度为1.58 μm。Abstract: The inhibiting effect of Cr coating on diamond oxidation in diamond/Al-borosilicate glass composites was studied. Coated diamonds with different Cr layer thickness was sintered with Al-borosilicate glass at the same process. The samples were tested and observed for volume expansion rate, bending strength and section morphology. The single particle compressive strength of sintered diamonds and the composition at the interface were analyzed. Results show that Cr coatings could protect the diamond through both isolation and consumption of oxygen, which effectively inhibits the oxidation of diamonds. Meanwhile, the thickness of coating layer has significant influence on diamond oxidation. If the coating is too thin, it could not continuously protect the diamond during high temperature sintering. If the coating is too thick, there would be cracks and flake spalling on it due to the thermal stress mismatch, exposing the diamond to oxygen environment and failing to protect. For 140/170 diamond, the optimum coating thickness is 1.58 μm.
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Key words:
- Cr coating /
- diamond /
- inhibiting oxidation
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图 2 不同复合材料的抗折强度与体积膨胀率
Figure 2. Bending strength and volume expansion rate of different composites
图 4 不同复合材料的抗折强度和体积膨胀率
Figure 4. Bending strength and volume expansion rate of different composites
图 5 金刚石颗粒的SEM照片
Figure 5. SEM images of diamond grits separated from the composites with
图 6 Cr镀层与金刚石界面处的线扫描分析
Figure 6. Linear scanning analysis of interface at Cr-coated diamond/vitrified bond composites
表 1 铝硼硅玻璃的化学成分
Table 1. Chemical compositions of alumino-borosilicate glass
化学成分 质量分数 w / % 化学成分 质量分数 w / % SiO2 51.77 B2O3 16.53 Al2O3 14.30 （Na2O+ K2O） 17.40 
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表 2 不同镀层厚度的镀Cr金刚石
Table 2. Cr-coated diamond with different coating thicknesses
序号 镀覆温度
θ / ℃镀覆时间
t / min质量增加
Δw / %镀层厚度
T / μm1 850 20 10 0.77 2 850 240 20 1.58 3 900 120 30 2.29 4 950 240 65 4.76
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表 3 金刚石烧结前后的单颗粒抗压强度值
Table 3. Compressive strength of single diamond grit used in the composites
类型 烧结前抗压
强度 F0 / N烧结后抗压
强度 Ft / N原生金刚石 29 20 20%增量的镀Cr金刚石 32 30
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