Kuwayama N, Kon M
Shika Rikogaku Zasshi. 1981 Apr;22(58):101-8.
Dental porcelains were made from frit and glass powder with electro fused alumina powder addition in the range from 20 to 60 wt% using sintering method at the temperature from 500 degree C to 1 000 degree C, and the effects of alumina content and firing temperature on firing processes of sintered composite were investigated. Shrinkage curves of the powder compacts varied with kind of frit and content of alumina. Particulary, powder compact with alumina addition in the range from 50 to 55% was found to have a remarkable influence for extention of firing temperature range. The densification of the powder compacts was considered to be accelerated by the dissolution of a small a mount of alumina particle into the frit and glass above 900 degree C. Expansion coefficient value of sintered composite of alumina and Pyrex glass powder gradually increased with increase of alumina content. Inversely, expansion coefficient of soda-lime-silica glass showed the minimum value at 40 wt% alumina content and then had a tendency of slight increases with increase of alumina content.
牙科陶瓷由玻璃料和玻璃粉制成，添加20%至60%重量比的电熔氧化铝粉，采用烧结法在500摄氏度至1000摄氏度的温度下进行烧制，并研究了氧化铝含量和烧制温度对烧结复合材料烧制过程的影响。粉末压块的收缩曲线随玻璃料种类和氧化铝含量而变化。特别地，发现氧化铝添加量在50%至55%范围内的粉末压块对扩大烧制温度范围有显著影响。900摄氏度以上，少量氧化铝颗粒溶解到玻璃料和玻璃中，加速了粉末压块的致密化。氧化铝与派热克斯玻璃粉烧结复合材料的膨胀系数值随氧化铝含量的增加而逐渐增大。相反，钠钙硅玻璃的膨胀系数在氧化铝含量为40%重量比时显示出最小值，然后随着氧化铝含量的增加有轻微增加的趋势。
