以熱壓燒結法製備Ti3SiC2陶瓷材料及其微結構與機械性質之研究

Investigation on Microstructure and Mechanical Properties of Ti3SiC2 Ceramics Synthesized by Hot-pressed Sintering

羅文賾(W.T. Lo) ； 黃肇瑞(J.L. Huang) ； 李丁福(D.F. Lii) ； 盧鴻華(H.H. Lu)

《材料科學與工程》 37卷4期 (2005/12) Pp. 189-195

https://doi.org/10.6409/JMSE.200512.0189

摘要

本研究以3Ti/1SiC/1C及3Ti/1SiC/1C/0.1Si（莫耳比）爲起始粉末，藉由熱壓燒結法於1300℃~1600℃，1 atm氬氣氣氛及25 MPa機械壓力下製備Ti3SiC2陶瓷材料，探討熱壓溫度以及矽添加量對於材料純度、密度、微結構及機械性質之影響。研究結果發現，隨著熱壓溫度提升，Ti3SiC2陶瓷材料的純度及視密度皆有增加的趨勢；而矽添加量對材料純度的影響，於較低熱壓溫度下有明顯的提升效果；其中，以3Ti/1SiC/1C/0.1Si成分於1500℃/1h進行熱壓燒結，可獲致最佳純度約97.4 vol.%，及相對密度約99.6%之Ti3SiC2陶瓷材料；其維氏硬度約3 GPa，四點彎曲強度約335 MPa，破壞韌性約7 MPa•Pm(上標 1/2)。

關鍵字

Ti3SiC2 ； 熱壓燒結

並列摘要

Ti3SiC2 ceramics were synthesized by reactive hot-pressing of 3Ti/1SiC/1C and 3Ti/1SiC/1C/0.1Si (molar ratio) powder mixtures at temperatures between 1300℃ and 1600℃under a pressure of 25MPa in 1 atm Ar atmosphere. The influence of composition and preparation parameters on the purity, density, microstructure and mechanical properties of Ti3SiC2 were investigated. Results indicated that the content and apparent density of Ti3SiC2 increased with increasing hot-pressed temperature. The amount of Si addition had substantial effects on the purity of Ti3SiC2 at lower hot-pressed temperature. The sample starting with 3Ti/1SiC/1C/0.1Si hot-pressed at 1500℃ for 1h composed the highest purity of Ti3SiC2 (97.4 vol%). The four-point bending strength, fracture toughness, hardness and relative density were 335 MPa, 7 MPa•Pm(superscript 1/2), 3 GPa and 99.6%, respectively. The microstructure of Ti3SiC2 ceramics were also studied.

並列關鍵字

Ti3SiC2 ； ceramic ； hot pressing ； microstructure ； mechanical properties