以竹碳顆粒製備碳化矽/鋁矽合金複合材料之研究

FABRICATION OF SIC/AL-SI ALLOY COMPOSITE FROM BAMBOO BIO-CARBON PARTICLES

楊傑閔(Jie-Min Yang)

指導教授 ： 林永仁

大同大學/工程學院/材料工程學系所/碩士(2010年)

摘要

本研究利用熱壓法製備竹碳碳化矽/鋁複合材料。先將竹碳與矽以1500℃持溫8小時，獲得具有竹子結構之碳化矽，再研磨過篩至-60+80、-200+325、-325mesh三種粒徑之竹碳碳化矽顆粒，以及將竹碳碳化矽改質，以金屬鎳添加入以上三種粒徑之竹碳碳化矽顆粒和竹碳碳化矽塊材。
實驗第一部份以-325mesh竹碳碳化矽顆粒與不同成分之Al-Si合金(7、9、12 wt% Si)經不同溫度下熱壓法製成複合材料，研究Si含量與溫度的影響。實驗第二部份是採用不同型式之碳化矽顆粒，以Al-12wt%Si合金在700℃下熱壓法製成複合材料，探討碳化矽粒徑及結構之影響。實驗第三部份採用竹碳碳化矽塊材，以Al-12wt%Si合金在700℃下壓力滲透製成複合材料，探討滲透效果。
實驗結果發現，考慮硬度、抗磨耗、雙軸彎曲強度等性質，市售碳化矽顆粒之試片粒度減小，以上之性質均能提升。相反的，竹碳碳化矽顆粒之試片，則是粒度增加，以上各種性質才得以提升。竹碳碳化矽顆粒可藉由添加鎳的改質，使上述之性質得以進一步提升。
以Al-12wt%Si合金與-60+80mesh含鎳(含鎳量為4.8wt%)竹碳碳化矽顆粒，在700℃、50MPa下進行熱壓，製得之複合材料，為本研究所得之最佳試片，其硬度為92.2(HRB15T)，雙軸彎曲強度為496(MPa)，並具有最低的磨耗損失。

關鍵字

壓力滲透 ； 鋁合金 ； 碳化矽 ； 複合材料 ； 竹碳

並列摘要

Abstract
Fabrication of bamboo-structured silicon carbide/aluminum composites was done by hot pressing. First, bamboo carbon and silicon were reacted at 1500℃ for 8 hours to form SiC with bamboo structure. Then, the SiC was ground to three different sizes: -60+80, -200+325 or -325mesh. In additions, Ni was added into SiC to facilitate the subsequent processing.
In the first part of the study, -325 mesh bamboo-structured SiC particles were hot-pressed with Al-Si alloys (Al with 7, 9, 12wt%Si) to form composites. The influences of Si content and hot pressing temperature were characterized. In the second part of the study, different types or sizes of SiC particles were hot-pressed with Al-12wt% alloy at 700℃. The influence of particle size and morphology were studied. In the third part of this study, bulk bamboo-structured SiC was pressure- infiltrated with Al-12wt% alloy at 700℃to form composites.
Results showed that for the composites made of commercial SiC particles, hardness, wear resistance and biaxial flexural strength increased with the decrease of the particle sizes. Contrastingly, when the sizes of the bamboo-structured SiC increased, all the above-mentioned properties were improved. When the bamboo-structured SiC was modified by the addition of nickel, the properties could be further improved.
The best sample obtained in this study was made of Al-12wt%Si and -60+80mesh bamboo-structured SiC particles with Ni addition, which were hot-pressed at 700℃ and 50MPa. For this sample, the hardness reached 92.2(HRB15T), the biaxial flexural strength was 496 MPa and the wear loss was the lowest of all.

並列關鍵字

pressure infiltration ； aluminum alloy ； Silicon carbide ； composite ； bamboo charcoal.

參考文獻

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