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題名 | 氧化鋁破壞強度與表面輪磨性質之研究 |
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作者 | 遲秉成; 韋文誠; 顧鈞豪; | 書刊名 | 材料科學 |
卷期 | 25:3 1993.09[民82.09] |
頁次 | 頁173-180 |
分類號 | 440.33 |
關鍵詞 | 表面; 氧化鋁; 破壞強度; 輪磨性質; |
語文 | 中文(Chinese) |
中文摘要 | 本研究採用四種磨粒粒徑(70、140、325;及800 mesh)的鑽石砂輪,以相 同的輪磨程序、進刀量及砂輪線速度輪磨氧化鋁試樣之抗張力表面,施以四點彎 曲測試其破壞強度,並以韋伯統計法計算測定值分佈情形,及以SEM觀察其破壞 面與研磨加工面。實驗結果發現粒徑較大的磨粒對氧化鋁表面所造成的加工損傷 為其破壞缺陷,同時表面刮痕較明顯,且有嚴重的塑性變形。使用粒徑較小的磨 粒其所造成的加工損傷並不明顯,此時表面性質對強度的影響較不重要,而由其 他製程缺陷,例如聚結粒,來控制氧化鋁的破壞強度。高強度氧化鋁的破壞面上 易形成鏡面、梳紋及裂縫分支的型態;反之,低強度的破壞面則無上述破壞型態, 且多呈穿晶破壞。 |
英文摘要 | In this study, diamond wheels containing various grit sizes, 70, 140, 325, or 800 mesh were used to grind the tensile surface of alumina test bars with the same grinding procedures, depth of cut and linear velocity of the wheel. The ground specimens were tested by 4-point bending method and calculated the flexural strength and strength distribution by Weibull statistics. The machining damage due to large size grit (coarser than 325 mesh) imposed upon the tensile surface of alumina is the strength-controlled factor. While the strength of the alumina ground by 325 mesh or finer diamond wheels is controlled by the other processing flaws, e.g. agglomerates, because the strength of specimen is insensitive to surface conditions. In the SEM observations the striations by hard-particle scratching are obvious and showing limited regions of plastic deformation on grinding surface which is ground by large grit-size wheel. Mirror, hackle and crack branching features can be observed on the fracture surface of high strength alumina; the fracture surface of low strength specimen is smooth and mostly trans granular. |
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