应用化学
應用化學
응용화학
CHINESE JOURNAL OF APPLIED CHEMISTRY
2009年
12期
1399-1403
,共5页
多孔碳化硅陶瓷%生物模板法%液相渗硅反应%显微结构%力学性能
多孔碳化硅陶瓷%生物模闆法%液相滲硅反應%顯微結構%力學性能
다공탄화규도자%생물모판법%액상삼규반응%현미결구%역학성능
porous silicon carbide ceramics%biotemplating%liquid silicon infiltration processing(LSIP)%microstructure%mechanical property
榉木经高温热解转化为生物碳模板,经液相渗硅反应(LSIP),在1 550 ℃、渗硅1.5 h、1 700 ℃抽真空排硅制备了保持木材微观结构的多孔Si/SiC生态陶瓷. 利用X射线衍射分析(XRD)和扫描电子显微镜(SEM)及压汞技术对样品的物相构成、显微结构和孔径分布进行了测试分析. 利用阿基米德法和三点弯曲法测定了多孔陶瓷的气孔率、密度和弯曲强度. 结果表明,最终产物由主晶相β-SiC和少量Si组成,控制高温排硅时间可以得到孔隙率为16%~32%的多孔Si/SiC生态陶瓷,可调控其产物的相组成和力学性能. 对LSIP工艺的反应机理进行了探讨.
櫸木經高溫熱解轉化為生物碳模闆,經液相滲硅反應(LSIP),在1 550 ℃、滲硅1.5 h、1 700 ℃抽真空排硅製備瞭保持木材微觀結構的多孔Si/SiC生態陶瓷. 利用X射線衍射分析(XRD)和掃描電子顯微鏡(SEM)及壓汞技術對樣品的物相構成、顯微結構和孔徑分佈進行瞭測試分析. 利用阿基米德法和三點彎麯法測定瞭多孔陶瓷的氣孔率、密度和彎麯彊度. 結果錶明,最終產物由主晶相β-SiC和少量Si組成,控製高溫排硅時間可以得到孔隙率為16%~32%的多孔Si/SiC生態陶瓷,可調控其產物的相組成和力學性能. 對LSIP工藝的反應機理進行瞭探討.
거목경고온열해전화위생물탄모판,경액상삼규반응(LSIP),재1 550 ℃、삼규1.5 h、1 700 ℃추진공배규제비료보지목재미관결구적다공Si/SiC생태도자. 이용X사선연사분석(XRD)화소묘전자현미경(SEM)급압홍기술대양품적물상구성、현미결구화공경분포진행료측시분석. 이용아기미덕법화삼점만곡법측정료다공도자적기공솔、밀도화만곡강도. 결과표명,최종산물유주정상β-SiC화소량Si조성,공제고온배규시간가이득도공극솔위16%~32%적다공Si/SiC생태도자,가조공기산물적상조성화역학성능. 대LSIP공예적반응궤리진행료탐토.
Biomorphic porous Si/SiC ceramics were prepared by liquid silicon infiltration-reaction and subsequent removal of residual Si. The microstructure morphology and component analysis of the cellular Si/SiC were investigated by means of scanning electron microscopy and X-ray diffraction. The porosity and distribution of the pore diameter of porous Si/SiC were determined by mercury intrusion method. Results show that the resulting porous ceramic is composed of major crystal phase β-SiC and secondary phase residual free Si. The ceramic composite maintained the original morphology of the wood and exhibited a porosity of 16%~32% by controlling the for Si removal time. The Archimedes and three-point bending methods were used to test the apparent porosity and bending strength of porous SiC ceramic. The influences of the Si removal time on the final phase composition and mechanic properties of the formed biomorphic Si/SiC ceramic composite were analyzed. The formation mechanism of SiC was also discussed.