本文關(guān)鍵詞： 多孔氮化硅 彎曲強(qiáng)度 密度 燒結(jié)溫度　出處：《硅酸鹽學(xué)報(bào)》2017年06期 　論文類型：期刊論文

【摘要】：采用干壓成型工藝和氣壓燒結(jié)方法制備了多孔氮化硅陶瓷。研究了燒結(jié)溫度和保溫時(shí)間對(duì)多孔氮化硅陶瓷顯微結(jié)構(gòu)和力學(xué)性能的影響,測(cè)定了不同燒結(jié)制度下多孔氮化硅陶瓷的氣孔率、物相組成、彎曲強(qiáng)度和彈性模量,分析了多孔氮化硅陶瓷的微觀結(jié)構(gòu)。結(jié)果表明:燒結(jié)溫度的提高可以促進(jìn)材料的致密化、α→β-Si_3N_4相轉(zhuǎn)變和β-Si_3N_4晶粒的生長,提高材料的彎曲強(qiáng)度。在1 900℃燒結(jié)溫度條件下,保溫15 min獲得的多孔氮化硅陶瓷的彎曲強(qiáng)度達(dá)到106 MPa,同時(shí)保留了較高的氣孔率49%。
[Abstract]:Porous silicon nitride ceramics were prepared by dry compression molding and pneumatic sintering. The effects of sintering temperature and holding time on the microstructure and mechanical properties of porous silicon nitride ceramics were studied. The porosity, phase composition, bending strength and elastic modulus of porous silicon nitride ceramics under different sintering conditions were measured. The microstructure of porous silicon nitride ceramics was analyzed. The results show that the increase of sintering temperature can promote the densification of porous silicon nitride ceramics. 鈫捨，

本文編號(hào)：1517023