摘要
为研究MgO与3种Al源粉体相变过程及合成MgAl_(2)O_(4)形貌及转化率对比,研究在不同温度下MgO与Al、Al_(2)O_(3)、Al(OH)_(3)的摩尔比分别为1∶2、1∶1和1∶2时混合粉体烧结的陶瓷,MgO与不同Al源材料粉体经球磨后,经1400℃煅烧粉体,历经不同的高温直至1600℃烧结制备陶瓷,采用DTA-TG、XRD及SEM表征制备的MgAl_(2)O_(4)陶瓷。结果表明,MgO-Al源制备的MgAl_(2)O_(4)陶瓷中,MgO-Al体系粉体经800℃煅烧后出现了AlN相,高于800℃煅烧后AlN相消失;经1600℃烧结后MgO-Al(OH)_(3)体系的MgAl_(2)O_(4)陶瓷致密度最高,达到94.5%,MgO-Al_(2)O_(3)体系由于原料与生成物体积膨胀率较大而使得烧结的MgAl_(2)O_(4)陶瓷孔隙较多,致密度相对较低。MgO-Al_(2)O_(3)体系和MgO-Al(OH)_(3)体系MgAl_(2)O_(4)相转化完全。该研究表明采用MgO-Al(OH)_(3)体系烧结合成MgAl_(2)O_(4)相效果最好。
This paper is directed at investigating the phase transformation process in MgO with three kinds of Al source powders,the contrast of the morphology and conversion between MgO and synthesized MgAl_(2)O_(4).The study operates by analyzing the mixed powders sintered ceramics with molar ratio of n(MgO)∶n(Al),n(MgO)∶n(Al_(2)O_(3)),n(MgO)∶n(Al(OH)_(3))by 1∶2,1∶1 and 1∶2 at different temperatures;ball-milleding the powders of MgO together with different Al source materials;calcining the powders at 1400℃;sintering the ceramics at different temperatures up to 1600℃,and characterizing the prepared ceramics MgAl_(2)O_(4)by using DTA-TG,XRD and SEM.The results show that in MgAl_(2)O_(4)ceramics prepared with MgO-Al source,AlN phase appears in the powder of MgO-Al system after calcination at 800℃,and disappears after calcination above 800℃;after sintering at 1600℃,the density of MgAl_(2)O_(4)ceramics in MgO-Al(OH)_(3) system is the highest,reaching 94.5%;sintered MgAl_(2)O_(4)ceramics have more pores and lower density due to the large volume expansion rate of raw materials and products;and MgO-Al_(2)O_(3) system and MgO-Al(OH)_(3) system transform into MgAl_(2)O_(4)phase completely.This research shows that the sintering synthesis of MgAl_(2)O_(4)phase has the best effect with MgO-Al(OH)_(3) system.
作者
李长青
毕建聪
刘宝良
高新明
Li Changqing;Bi Jiancong;Liu Baoliang;Gao Xinming(School of Materials Science&Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China;Architecture&Civil Engineering Institute,Guangdong University of Petrochemical Technology,Maoming 525000,China)
出处
《黑龙江科技大学学报》
2022年第6期733-741,共9页
Journal of Heilongjiang University of Science And Technology
基金
黑龙江省自然科学基金项目(LH2021E107)
黑龙江省省属本科高校基本科研业务费项目(2021-KYYWF-1459)。
关键词
氧化镁-铝源
球磨
煅烧
镁铝尖晶石
magnesium oxide-aluminum source
ball milling
calcination
magnesia alumina spinel
