【摘要】：以活性氧化鋁為原料,分別引入La_2O_3、LaAlO_3和預(yù)合成的LaAl_(11)O_(18),制備剛玉-六鋁酸鑭復(fù)相材料。研究了氧化鑭的不同引入方式、引入量和煅燒溫度對(duì)剛玉-六鋁酸鑭復(fù)相材料的燒結(jié)行為的影響,并通過(guò)XRD、SEM等手段對(duì)其物相組成和顯微結(jié)構(gòu)進(jìn)行表征。結(jié)果表明:在活性氧化鋁中加入La_2O_3,LaAlO_3和預(yù)合成LaAl_(11)O_(18),均能生成六鋁酸鑭相,生成的六鋁酸鑭分布在剛玉晶粒的晶界處,不利于剛玉陶瓷的燒結(jié),以LaAlO_3為氧化鑭源制備的試樣致密化程度高;隨著LaAlO_3含量的增加試樣致密化程度逐漸減小,當(dāng)煅燒溫度為1650℃時(shí),試樣的致密化程度相對(duì)較高,剛玉和六鋁酸鑭晶粒尺寸相對(duì)較小。
[Abstract]:Corundum-lanthanum aluminate multiphase material was prepared by introducing La_2O_3,LaAlO_3 and presynthetic LaAl_ _ (11) O _ (18) with active alumina as raw material. The effects of different ways of introducing lanthanum oxide, the amount of lanthanum oxide and calcination temperature on the sintering behavior of corundum-lanthanum hexaaluminate composites were studied. The phase composition and microstructure of the composite materials were characterized by XRD,SEM. The results show that both La_2O_3,LaAlO_3 and LaAl_ _ (11) O _ (18) can form lanthanum hexaaluminate phase, and lanthanum hexaaluminate is distributed at the grain boundary of corundum grain. It is not conducive to sintering of corundum ceramics, and the densification degree of the samples prepared with LaAlO_3 as lanthanum oxide source is high. With the increase of LaAlO_3 content, the densification degree of the sample decreases gradually. When the calcination temperature is 1650 鈩，

本文編號(hào)：2301566