|
|
|
Journal of the Korean Ceramic Society 1986;23(5): 67. |
| 반응결합 질화수소의 소결시 규소의 거동에 관한 연구 |
| 김재룡, 김종희 |
| 한국과학기술원재료공학과 |
| The behavior of Si During Sintering of Reaction Bonded Silicon Nitride |
|
|
|
|
|
|
|
| ABSTRACT |
|
To investigate the effects of unreacted silicon on the $alpha$/$beta$transfornation variation of morphology and mechanical strength of Sintered Reaction Bonded Silicon Nitride the mixtures of $alpha$-$Si_3N_4$ and Si powder and Reaction Bonded Silicon Nitride were heat treated. The heat-treatments were performed in Ar atmosphere in order to inhibit the nitridation of silicon. In the mixtures heat-trated at 1$700^{circ}C$ the amount of $beta$-TEX>$Si_3N_4$transformed from $alpha$-TEX>$Si_3N_4$was sigmoidally increased and the equiaxed $alpha$-TEX>$Si_3N_4$grains elongated with the amount of silicon and heat treating time. And large $beta$-TEX>$Si_3N_4$grains grown into silicon were observed. On the other hand there was no change in the heat-treatment of pure $alpha$-TEX>$Si_3N_4$In case of the heat-treatment of RBSN the same phenomena due to the silicon appearing from the decomposition of $alpha$-Smatte and needle were observed. From the three point bending test the strength of the sintered specimens with the and without 5wt% silicon addition had 53Kg/$mm^2$ and 73Kg/$mm^2$ respectively. |
|
|
|
PDF Links
Full text via DOI 
Download Citation 
