摘要
研究了新型热障涂层材料镁基六铝酸镧（LaMgAl11O19），并制备了可应用于大气等离子喷涂的镁基六铝酸镧喷涂粉末。用差热分析技术研究了镁基六铝酸镧的生成温度，用XRD分析了不同温度下反应产物的相结构，用SEM观察了烧结前后喷雾干燥粉末的形貌，并对镁基六铝酸镧粉末进行了1300℃下50h的时效实验。结果表明：混合粉末中LaMgAl11O19相的生成量取决于保温温度和保温时间两方面；LaMgAl11O19。相的实际开始生成温度在1200～1300℃之间，结束生成温度在1553．5℃；随着保温温度的升高，LaMgAl11O19相的生成效率有所提高；在1570℃保温2h，可得单一相成分的近球形镁基六铝酸镧喷涂粉末；镁基六铝酸镧收缩率约为2．8％，经过时效处理的粉末中LaMgAl11O19。相的峰值显示了比没有经过时效处理的粉末更高的强度。
A new thermal barrier coatings material LaMgAl11O19 was studied, and LaMgAl11O19 spray powder that could apply in APS was prepared. The generating temperature of LaMgAl11O19 was analyzed by DSC, the phase structure was inspected by XRD, the microstructure of powder was observed by SEM, and the aging test was taken for 50h at 1300℃. The results showed that the generating a-mount of LaMgAl11O19 phase lay on holding temperature and time; the start generating temperature of LaMgAl11O19 phase was about 1200-1300℃, the finish generating temperature was 1553. 5℃ ; the generating efficiency of LaMgAl11O19 phase was improved following along the elevation of holding temperature; the single phase LaMgAl11O19 spray powder could be prepared with holding temperature for 2 hours at 1570℃ ; the rate of shrinkage of LaMgAl11O19 was about 2.8%, the peaks of LaMgAl11O19 phase in the powder with aging test showed a higher intensity than in that without aging test.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2006年第7期14-18,共5页
Journal of Materials Engineering
关键词
热障涂层
六铝酸镧
差热分析
喷涂粉末
thermal barrier coatings
lanthanum hexaaluminate
DSC analysis
spray powder
