摘要
本文以金属Al粉和α-Al2O3微粉为添加剂,研究其添加量对陶瓷结合剂性能和显微结构的影响。通过X-ray衍射仪和扫描电子显微镜分析得知,金属Al粉添加量为4wt%,在620℃温度下烧成时,金属Al粉主要以单质熔融铝的形式存在,且熔融铝与陶瓷结合剂结合良好,使得试样的强度比基础陶瓷结合剂提高了10.3%;试样中单独加入α-Al2O3微粉可以提高陶瓷结合剂的粘度,有效防止烧成过程中的不均匀变形,同时可以提高陶瓷结合剂的致密度;金属Al粉添加量为2wt%,同时加入30wt%的α-Al2O3,在680℃下烧成时,大部分的金属Al粉被氧化为氧化铝,α-Al2O3微粉和金属Al粉氧化生成的氧化铝进一步增强了陶瓷结合剂的致密度,并且与陶瓷结合剂反应生成可以拓宽烧结范围、抑制裂纹延伸的霞石(NaAlSiO4),使得试样的强度比基础陶瓷结合剂提高了195.5%。
In this article, the effect of aluminum powder and or-A1203 powder on the properties and microstructure of vitrified bond has been studied by means of X-ray diffraction and scanning electron microscopy analysis. It showed that aluminum mainly existed in the form of molten aluminum, which had a good combination with vitrified bond and which was increased by 10.3% than the strength of based vitrified bond when the addition of aluminum powderg content was 4wt% and sintered at 620 ℃ The a- A1203 powder could improve the viscosity of the vitrified bond, effectively prevent samples＇ deformation during the sintering process and improve the density of the vitrified bond. When the sintering temperature was 680 ℃, the addition of aluminum powder content was 2wt% and the addition of a-A1203 powder was 30wt% , most of aluminum oxidized and formed alumina. In this situation, the a-A1203 powder and the formed alumina improved the density of the vitrified bond, and reacted with vitrified bond to form nepheline （NaA1SiO4 ） which could widen the sintering range and inhibit the crack propagation and which wns increased by 195.5% than the strength of based vitrified bond.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2012年第5期1062-1065,1071,共5页
Bulletin of the Chinese Ceramic Society
基金
陕西省"国家重点学科资助项目"资助项目
广东奔朗超硬材料制品有限公司教育奖学金资助项目
