摘要
为了提高暖通冷凝器用LaMgAl_(11)O_(19)热障涂层的性能,在沉淀温度60℃,pH值11.5条件下采用沉淀法制备LaMgAl_(11)O_(19)热障涂层粉末,通过实验测试分析温度对其组织形貌、半峰全宽和谱强的影响。研究结果表明:LaMgAl_(11)O_(19)粉末中存在立方形态的Mg Al O_(4),以及六方晶的LaAl_(2)O_(3)和La_(2)O_(3)。LaMgAl_(11)O_(19)粉末呈现六角晶体结构特征,且粒径接近2.7μm。LaMgAl_(11)O_(19)粉末形成了Al2p、La3d、O1s、Mg2p电子衍射峰。提高烧结温度后,各元素的电子结合能明显波动,出现了高能端偏移现象。随着LaMgAl_(11)O_(19)粉末持续转变成磁铅石,MgAlO_(4)和LaAl_(2)O_(3)都形成更大的半峰宽。温度未超过1300℃时,烧结期间产生了更高比例的La_(2)O_(3)键,继续提高温度超过1300℃之后,发生了La_(2)O_(3)键数量减少的变化趋势。该研究的LaMgAl_(11)O_(19)粉末具有很好的隔热和抗高温性能,有利于提高涂层的抗烧结能力及热稳定性。
In order to improve the properties of LaMgAl_(11)O_(19) thermal barrier coating for HVAC condenser,the LaMgAl_(11)O_(19) thermal barrier coating powder was prepared by precipitation method at precipitation temperature of 60℃and pH value of 11.5.The effects of temperature on the microstructure,half-peak full width and spectral strength were analyzed.The results show that there are cubic Mg Al O;and hexagonal LaAl_(11)O_(19) and La_(2)O_(3) in LaMgAl_(11)O_(19) powder.The LaMgAl_(11)O_(19) powder has a hexagonal crystal structure and the particle size is close to 2.7μm.These Al2p,La3d,O1s and Mg2p electron diffraction peaks are formed in LaMgAl_(11)O_(19) powder.After increasing the sintering temperature,the electron binding energy of each element fluctuates obviously,and the phenomenon of high energy end deviation appears.With the continuous transformation of LaMgAl_(11)O_(19)powder into magnetite,both MgAlO_(4)and LaAl_(11)O_(19)form larger half-peak width.When the temperature is blow 1300℃,a higher proportion of La_(2)O_(3)bonds are generated during sintering.When the temperature continues to rise above 1300℃,the number of La_(2)O_(3)bonds decreases.The LaMgAl_(11)O_(19)powder has good heat insulation and high temperature resistance,which is beneficial to improve the sintering resistance and thermal stability of the coating.
作者
陈祥芬
李超
CHEN Xiangfen;LI Chao(School of mechanical and electrical engineering,xianyang vocational and technical college,xianyang 712000,China;Institute of metals,Chinese academy of sciences,shenyang 100162,China)
出处
《粉末冶金工业》
CAS
北大核心
2021年第6期77-80,共4页
Powder Metallurgy Industry
作者简介
陈祥芬(1974-),女,硕士,高级讲师,主要研究方向为供热通风与空调工程。
