【摘要】 在陶瓷磨具的制作过程中,α-Al2O3经常作为一种填料加入到陶瓷结合剂中,用以改善陶瓷磨具的强度、烧结温度等性能。本文以α-Al2O3的加入量对陶瓷结合剂结合性能的影响为研究对象,通过测试不同温度、不同配比的陶瓷试条的抗折强度及晶相分析,深入探讨陶瓷结合剂的结合机理及α-Al2O3在其中所起的作用,并找出其中规律。研究表明,通过加入α-Al2O3提高结合剂的黏度,可有效防止试条在烧结过程中变形的发生,随着α-Al2O3的加入量的增加,结合剂强度会呈现一个先上升后下降的趋势,在某一特定黏度下结合强度将达到最大值;随着烧结温度的升高,需要加入更大比例的α-Al2O3粉,来调节其黏度,这使得不同温度下烧结的试条强度的峰值所在位置发生偏移;在高于750℃下烧结,α-Al2O3可以与陶瓷结合剂中的Li-Si-O相发生反应生成LiAl(SiO3)2微晶玻璃相,该晶相在陶瓷结合剂中形成的微晶玻璃相起到钉扎裂纹的作用,防止其扩散、延伸,有助于增强陶瓷磨具强度。更多还原

【Abstract】 α-Al2O3 is one of the prevalent additive in the producing of ceramic grinding tools.There are many use of α-Al2O3 additive such as increasing the mechanical intensity of the ceramic grinding tools and making the melt point rise.In this paper,the effect of temperature and α-Al2O3 additive on the ceramic bonding of grinding tools was discussed.According to the mechanical intensity and the composition of the sample,which is sintered at different temperature with different α-Al2O3 content,we found the rules how α-Al2O3 additive work on the bonds.The results showed that α-Al2O3 can increase the viscosity of ceramic bonds to avoid the distortion while sintered at high temperature.The mechanical intensity would come to maximum at a special α-Al2O3 content.That means it would come to maximum at a special viscosity.The viscosity is not only affected by α-Al2O3 additive but also by the temperature.Therefore,we could find that the proportion of α-Al2O3 where the mechanical intensity reach the maximum is different at different temperature,the higher temperature the more α-Al2O3 needed.While the sample sintered at the temperature higher than 750℃,α-Al2O3 would compound with the Li-Si-O phase in the ceramic bond.And the resultant is LiAl(SiO3)2 Glass-ceramics.The LiAl(SiO3)2 crystal can fix the microcracks in the ceramics.In this way the crystal increase the intensity of ceramic grinding tools.更多还原