CAJ | 학술논문

采用两步热压烧结(Hot Pressing, HP)方法制备了高致密度的Y-α-SiAlON(Y1410,即m=1.4, n=1.0)陶瓷,研究了升温速率、烧结时间和驻留温度对陶瓷物相组成、微观结构以及光学性能的影响.结果表明:SiAlON陶瓷的相组成不受升温速率的影响,升温速率较快 (20 ℃/min) 时陶瓷的晶粒尺寸相对较小、分布较均齐、透过率相对较高,1.1 mm厚样品最大近红外透过率为50.2%,比升温速率为10 ℃/min的陶瓷高8.0%;烧结时间较短 (1 h) 时陶瓷的晶粒尺寸相对较小,透过率较高,1.1 mm厚样品最大近红外透过率为43.6%,而当烧结时间为2 h时陶瓷中有新相生成,且微结构均匀性较差,其最大透过率比烧结时间为1 h的低8.0%;较低的驻留温度易促进β-SiAlON形成和柱状晶发育,对提高SiAlON陶瓷透光性不利.
채용량보열압소결(Hot Pressing, HP)방법제비료고치밀도적Y-α-SiAlON(Y1410,즉m=1.4, n=1.0)도자,연구료승온속솔、소결시간화주류온도대도자물상조성、미관결구이급광학성능적영향.결과표명:SiAlON도자적상조성불수승온속솔적영향,승온속솔교쾌 (20 ℃/min) 시도자적정립척촌상대교소、분포교균제、투과솔상대교고,1.1 mm후양품최대근홍외투과솔위50.2%,비승온속솔위10 ℃/min적도자고8.0%;소결시간교단 (1 h) 시도자적정립척촌상대교소,투과솔교고,1.1 mm후양품최대근홍외투과솔위43.6%,이당소결시간위2 h시도자중유신상생성,차미결구균균성교차,기최대투과솔비소결시간위1 h적저8.0%;교저적주류온도역촉진β-SiAlON형성화주상정발육,대제고SiAlON도자투광성불리.
Dense Y-α-SiAlON (Y1410 with m=1.4 and n=1.0) was prepared by two-steps hot pressing sintering, and the effects of heating rate, sintering time and holding temperature on phase composition, microstructure and optical properties of sintered samples are studied. The results show that heating rate have no effect on phase composition, but which affect microstructure and optical property, when heating rate is faster (20 ℃/min), microstructure of smaller grain and uniform distribution was observed, and the SiAlON ceramics show higher transmiitance, the maximum transmittance reaches 50.2% for 1.1 mm thickness sample, which is higher 8.0% than sample heating with 10 ℃/min; for the sample with shorter sintering time (1 h), its grain is small and transmittance is higher, the maximum value is 43.6% for 1.1 mm sample, however, for the sample sintered 2 h, new phase was detected, and the grain abnormal develop, which maximum transmittance is by 8.0% higher than that of samples sintered by 1 h; holding temperature at lower temperature during heating contributes to β-SiAlON form and grain abnormality development, which is disadvantage to improving transmittance of SiAlON ceramics.