| タイトル | Slurry-pressing consolidation of silicon nitride |
| 著者（英） | Sanders, William A.; Kiser, James D.; Freedman, Marc R. |
| 著者所属（英） | NASA Lewis Research Center |
| 発行日 | 1989-10-01 |
| 言語 | eng |
| 内容記述 | A baseline slurry-pressing method for a silicon nitride material is developed. The Si3N4 composition contained 5.8 wt percent SiO2 and 6.4 wt percent Y2O3. Slurry-pressing variables included volume percent solids, application of ultrasonic energy, and pH. Twenty vol percent slurry-pressed material was approximately 11 percent stronger than both 30 vol percent slurry-pressed and dry-pressed materials. The Student's t-test showed the difference to be significant at the 99 percent confidence level. Twenty volume percent (300 h) slurry-pressed test bars exhibited strengths as high as 980 MPa. Large, columnar beta-Si3N4 grains caused failure in the highest strength specimens. The improved strength correlated with better structural uniformity as determined by radiography, optical microscopy, and image analysis. |
| NASA分類 | NONMETALLIC MATERIALS |
| レポートNO | 90A27691 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/357454 |
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