用內在反應法以TiB2來增強莫來石之研究

In situ reacted TiB2-reinforced mullite

黃偉誠(Wei-Cheng Huang)

指導教授 ： 何智廷

國立虎尾科技大學/工程學院/機械設計工程系碩士班/碩士(2017年)

摘要

本實驗是研究利用TiO2、硼和碳在莫來石基質生成TiB2。在熱壓和無壓燒結的樣品中，除了TiB2外，也發現TiC被分散在莫來石基質相。在無壓燒結中，利用1300℃超過3小時之預熱及超過1600℃1小時之燒結，可以得到相對密度達98%之莫來石/ TiB2複合材料。含有30%TiB2經熱壓而成之複合材料具有427 MPa之彎曲強度和4.9 MPa m1/2的斷裂韌性。並將其複合材料運用到熱導管且進行導管應力及挫曲現象分析。

關鍵字

二硼化鈦 ； 莫來石 ； 挫曲 ； 熱導管

並列摘要

In situ formation of TiB2 in mullite matrix through the reaction of TiO2, boron and carbon has been studied. In hot-pressed and pressureless-sintered samples, in addition to TiB2, TiC was also found to be dispersed phases in mullite matrix. However, in the case of pressureless-sintered samples, mullite/TiB2 composite with 98% relative density can be obtained through a preheating step held at 1300ﾟC for longer than 3h and then sintering at a temperature above 1600ﾟC. Hot-pressed composite containing 30 vol% TiB2 gives a flexural strength of 427 MPa and a fracture toughness of 4.9 MPa m1/2. The composites were applied to the diffuser nozzle and the nozzle’s stress and the buckling are analyzed.

並列關鍵字

TiB2 ； mullite ； Buckling ； Diffuser Nozzle

參考文獻

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