Effect of sodium dodecyl benzene sulfonate on vitrified bond and dispersion of diamond
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摘要: 采用溶胶–凝胶法制备陶瓷结合剂粉末和陶瓷结合剂/金刚石混合粉末以及相应的块体材料。研究分散剂（十二烷基苯磺酸钠）质量分数为0～4.02%时，其对陶瓷结合剂物相、耐火度、弯曲强度和热膨胀系数等的影响，以及其对M2.5/5金刚石在陶瓷结合剂/金刚石混合粉末中分散性的影响。结果表明：分散剂质量分数为1.34%时，陶瓷结合剂的耐火度、弯曲强度和热膨胀系数与未添加分散剂时相比未发生明显变化，其中耐火度为700 ℃、弯曲强度为45 MPa 、热膨胀系数为4.3×10−6 ℃−1；当分散剂的质量分数从1.34%增加至4.02%时，陶瓷结合剂的耐火度降至600 ℃，弯曲强度降至28 MPa，热膨胀系数增至7.5×10−6 ℃−1；分散剂质量分数为1.34%时，M2.5/5金刚石均匀分散在陶瓷结合剂/金刚石复合材料中，且未引起复合材料的性能变化。Abstract: Vitrified bonds and the mixed powders of diamond and vitrified bonds are prepared by sol-gel and corresponding bulk composites are fabricated. The effect of mass fraction of dispersant (sodium dodecyl benzene sulfonate) ranged from 0 to 4.02% on property of vitrified bond is studied, including composition phase of vitrified bond, refractoriness, bending strength and thermal expansion coefficient. The dispersibility of M2.5/5 diamond dispersed in the mixed powders is investigated. The result reveals that when the mass fraction of dispersant was 1.34%, refractoriness of 700 ℃, bending strength of 45 MPa and coefficient of thermal expansion of 4.3×10−6 ℃−1 have no change compared with that without addition of dispersant. Besides, with the dispersant increasing from 1.34% to 4.02% the refractoriness of vitrified bond prepared by sol-gel technique decreases to 600 ℃ and bending strength decreases to 28 MPa. The thermal expansion coefficient of vitrified bond increases to 7.5×10−6 ℃−1. The research demonstrates that the addition of 1.34% dispersant can realize uniform dispersion of M2.5/5 diamond powder in vitrified bond /diamond composites without causing change in properties of the composites.
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图 1 不同质量分数分散剂陶瓷结合剂的XRD图谱
Figure 1. XRD patterns of vitrified bond with different mass fractions of dispersant
图 2 不同质量分数分散剂陶瓷结合剂的烧结性能
Figure 2. Sintering properties of vitrified bond with different mass fractions of dispersant
图 3 不同质量分数分散剂陶瓷结合剂煅烧后的红外光谱
Figure 3. Infrared spectra of samples calcined with different mass fractions of dispersant
图 4 不同质量分数分散剂陶瓷粉末的热膨胀系数变化
Figure 4. Thermal expansion coefficient of vitrified bond with different mass fractions of dispersant
图 5 不同质量分数分散剂和11.11%质量分数金刚石制备样品的截面SEM图
Figure 5. SEM patterns of polished sintered samples with different mass fractions of dispersant and 11.11% diamond
表 1 试验用原材料组分
Table 1. Components of starting materials utilized in the experiment
组分 质量分数 wt / % SiO2 72.22 B2O3 2.78 Na2O 5.56 Al2O3 8.33 金刚石 11.11，0 十二烷基苯磺酸钠 0，0.67，1.34，2.68，4.02 
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表 2 不同质量分数分散剂制备陶瓷结合剂样条的硬度和密度
Table 2. Hardness and density of vitrified bonds with different mass fractions of dispersant
分散剂质量分数 w / % 洛氏硬度 HRC 密度 ρ / (g·cm−3) 0 83.2 2.25 0.67 85.8 2.22 1.34 78.1 2.21 2.68 40.3 1.22 4.02 28.4 < 1.00
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