Preparing low-temperature vitrified bond composite sintered body withnano-diamond by polyacrylamide-gel method
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摘要: 使用高分子网络凝胶法(polyacrylamide-gel method,简称P-G法)制备纳米金刚石(nano-diamond,ND)-低温陶瓷结合剂复合烧结体,并设计4种不同金刚石添加量来制备试样条,然后考察二氧化硅包覆纳米金刚石(ND@SiO2)在陶瓷结合剂中分散的均匀性,并对比分析试样的物相、抗弯强度和显气孔率。实验结果表明:利用P-G法制备的试样中的金刚石浓度从25%增加到100%时,ND@SiO2在凝胶体中分散均匀,无明显团聚现象;其烧结温度范围为670~720℃,抗折强度达到66.4~87.6 MPa,气孔率为10.2%~22.4%。Abstract: Low-temperature vitrified bond composite sintered body with nano-diamonds (ND) are prepared by polyacrylamind-gel method. The samples with different diamond contents are made to test the uniformity of ND@SiO2 dispersed in the vitrified bond. Then the micro structure, phase composition, bending strength and porosity of sintered body are analyzed and compared. Results show that when the diamond concentration increases from 25% to 100%, the ND@SiO2 are uniformly dispersed and there is no obvious agglomeration in the gel. The sintering temperature of ND@SiO2-vitrified bond ranges from 670 to 720℃, then bending strength of which is 66.4 to 87.6 MPa with the porosity of 10.2% to 22.4%.
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Key words:
- diamond concentration /
- sintering temperature /
- bending strength /
- porosity
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