Mg-Al 黃酸鹽 水化物의 熱分解 의한 合成 스피넬 粉末의 特性 및 燒結性 = Characterization and Sinterability of the Resultant Spinel Power by a Thermal Decomposition of Mg-Al Sulface Hydrate

다국어 초록 (Multilingual Abstract)

The resultant spinel powders made from Mg-Al sulfate hydrate were characterized and
their sinterability was investigated.
Powders obtained from the calcattice of sulfate at 1100℃ to 1300℃ were identified as
a spinel showing that their lattice parameter was 8.087 A, and their apparent crystallite
size was about 500 A, and their specific surface was relatively large, about 32 ㎡/g.
Initial sintering mechanism of these compacts was volume diffusion, and the temperature
dependence of the apparent diffusion coefficient could be represented by D=8.82×10^(22)
exp [(-106,000 cal/mole)/RT] ㎠/s. The dense body (3.58 g/㎤) with 99.7% of theoretical
density was obtained by firing at relatively low temperature as 1500℃ in air. The
bimodal structure resulted from secondary recrystallization, i.e., discontinuous or
exaggerated grain growth was observed in the microstructure of specimen fired at 150
0℃ for 2h.

목차 (Table of Contents)

• Abstracts
• 1. 序論 = 169
• 2. 압분체의 수축에 대한 소결모델의 적용 = 170
• 3. 實驗 方法 = 171
• 4. 實驗結果 및 考察 = 172
• 5. 結論 = 178
• 參考文獻 = 178