【正文】 liminary research, and has carried on the theoretical analysis, to explore the relationship between its microstructure and properties. Through the relative density of SiC ceramic pound phase spectrum and XRD analysis, found that high pressure sintering SiC ceramic material with excellent performance, mainly reflected in the performance of thermal conductivity and toughness in, has the good application prospect. Compared with normal pressure, high pressure sintering can effectively reduce metal sintering time and sintering the ceramic system, promote densification, and thus achieve the purpose of improving performance. Cubic high pressure sintering technology is a fast and efficient sintering technology, greatly reducing the sintering temperature and shorten the sintering time, and SiC 陶瓷的高壓燒結工藝及性能材料專業(yè)本科畢業(yè)論文 河 III close to the theoretical density of the posite ceramic materials can be prepared. Using high pressure sintering process can be obtained by sintering without sintering aids added high density SiC ceramics (density of 92% to 100%). Sintering properties of ceramics have a significant impact, the experimental results show that: Al2O3 sintered SiC is effective sintering aids, in the low dosage (about 2wt%) to achieve a fully dense sintered ceramic. The sintering process is similar with added the sintering aids Ceramics pure SiC sintered similar, but the density of the ceramic is generally higher. Keywords: SiC ceramics, high temperature and high pressure technology, sintering properties, phase analysis (XRD spectra) SiC 陶瓷的高壓燒結工藝及性能材料專業(yè)本科畢業(yè)論文 河 i 目錄 1 緒論 ..............................................................................................................1 引言 ......................................................................................................1 的簡介 ............................................................................................2 的結構及性能 .....................................................................2 SiC 粉體的制備方法 ................................................................2 燒結方法 ........................................................................................8 反應燒結 ...................................................................................8 再結晶燒結法 ...........................................................................9 硅滲 SiC 燒結技術 ...................................................................9 等離子體電火花燒結（ SPS） .................................................9 常壓燒結 .................................................................................10 高壓燒結法 .............................................................................10 碳化硅陶瓷的應用 ............................................................................ 11 陶瓷的研究現狀 .......................................................................... 11 本課題的研究任務和內容 ................................................................12 2 高溫高壓技術 ............................................................................................13 引言 ....................................................................................................13 高溫高壓設備 ....................................................................................13 壓力和溫度控制系統(tǒng) ........................................................................15 壓力控制系統(tǒng) .........................................................................15 溫度控制系統(tǒng) .........................................................................15 壓力的標定和油壓控制 ....................................................................16 壓力的標定 .............................................................................16 油壓的控制 .............................................................................18 SiC 陶瓷的高壓燒結工藝及性能材料專業(yè)本科畢業(yè)論文 河 ii 溫度的標定 ........................................................................................19 腔體材料的選擇 ................................................................................20 加熱源材料的選擇 ............................................................................22 3 實驗原料及實驗方法 ................................................................................23 實驗原料 ............................................................................................23 粉末 ...................................................................................23 其他原料 .................................................................................23 實驗方法 ............................................................................................23 試樣制備 .................................................................................23 高壓燒結制度 .........................................................................24 陶瓷材料研究技術路線 ..............................................................25 性能測試 ............................................................................................26 包套去除及分析樣加工 .........................................................26 根據阿基米德原理測樣品的密度（排水法） .....................26 物相分析 .........................................................................27 4 SiC 陶瓷的高壓燒結 .................................................................................28 引言 ....................................................................................................28 未添加燒結助劑時溫度、時間對陶瓷燒結性能的影響 ................28 燒結溫度對陶瓷燒結性能的影響 .........................................28 燒結時間對陶瓷燒結性能的影響 .........................................29 添加燒結助劑對陶瓷燒結性能的影響 ............................................30 燒結助劑添加量對陶瓷燒結性能的影響 .............................31 燒結溫度對陶瓷燒結性能影響 .............................................33 燒結時間對陶瓷燒結性能的影響 .........................................34 高壓燒結機理 ...........................................................