シラスの工業的利用に関する研究 (第21報) : シラスガラスから得られる炭化ケイ素焼結体の機械的性質及び耐化学薬品性・耐酸化性

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Two kinds of SiC powders (A and B) were synthesized from mixtures of Shirasu glass and carbon black heated at 1650°C and 1900°C in a vacuum (0.1mmHg). The SiC powders and additives such as Al(2%), AL(2%)+B(2%)+C(2%) or AIN(2%)+B(2%)+C(2%) were hot-pressed under a pressure of 400Kg/cm^2 at 1900°C for 30min. The relative density of the most densified specimen by hot-pressing was 99%. The hot-pressed specimens were tested on bending strength, Vickers hardness, acid durability, alkaline durability and oxidation resistance. The results obtained on the specimens having relative densities > 97% are as follows: The bending strength was 55-60kg/mm^2 and the Vickers hardness was 2700-3000kg/mm^2. In both the acid (12N Hcl) and the alkaline (6N NaOH) durability tests at 80°C, the values of weight loss were 0.1-0.2wt%. In oxidation resistance tests (in air) at 1400°C, values of weight gain were 1.0-1.5mg/cm^2.
鹿児島大学,カゴシマダイガク,Kagoshima Universityの論文
1984-11-01