Preparing low-temperature vitrified bond composite sintered body withnano-diamond by polyacrylamide-gel method

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%.