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題名 | 碳化矽基材料混合次微米氧化鋁粉末之漿體及生坯性質探討=Study on the Rheological and Green Properties of SiC BasedMaterials Mixed with Submicrometric Al[feaf]O[feb0]Powder |
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作者 | 韋文誠; 謝長利; 鄭水金; | 書刊名 | 材料科學 |
卷期 | 29:4 1997.12[民86.12] |
頁次 | 頁254-260 |
分類號 | 440.33 |
關鍵詞 | 碳化矽; 氧化鋁; 混合; 流變; 粉末堆積; Silicon carbide; Alumina; Mixture; Rheology; Powder packing; |
語文 | 中文(Chinese) |
中文摘要 | 本研究採用兩種碳化矽及一種次微米氧化鋁粉末,以計量方式混合,添加高分子 分散劑 (聚甲基丙烯酸銨 ),調配水基泥漿,利用同軸圓柱黏度儀,測定視黏度與剪應變、 固相承載量之間的關係,其中部份製程配方所製得之泥漿顯示低黏度值,且呈現接近牛頓流 體之行為。而後再利用注漿成形技術,製成生坯,測其生坯密度,找出不同黏度值的泥漿與 製得高密度的生坯之對應關係,可得到高緻密性的氧化鋁 / 碳化矽複合生坯材料。 另外, 再利用 Dougherty-Krieger 方程式,以及流變指數關係, 分析泥漿的黏度曲線,找出對應 的 K、f 及 n 值,此結果再和實驗的條件作比較,相當的吻合。 |
英文摘要 | In this study, a mixture of two silicon carbide and one submicrometric alumina powders were used to prepare slurries with selected compositions. Water based suspensions with a dispersant (ammonium salt of polymethylacrylic acid) were prepared for the study. Concentric cylinder viscometer was applied to investigate the relationship of apparent viscosity with various shear rates and solid loadings. Some of the prepared suspension showed low apparent viscosity and a behavior close to Newtonian. The suspensions were slip-casting to obtain green bodies. Then their densities were measured and compared as a function of their apparent viscosity. Besides, the viscosity curves were analyzed so to fit Dougherty-Krieger powerlaw equations, and then the shape factor, critical packing density and flow index value were determined. These results are consistent with the dispersion conditions of slurries. The composites of alumina/silicon carbide with a high green density and well uniformity could be produced by this process. |
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