摘要
采用改进的等离子体电解氧化(PEO)技术在锆盐体系和锆盐-钇盐体系电解液中制备ZAl Sil2Cu3Ni2合金表面ZrO_2-Y_2O_3陶瓷层和Y_2O_3-ZrO_2-Y_2O_3陶瓷层,研究电解液中稀土钇盐Y(NO_3)_3对PEO陶瓷层组织和耐高温性能的影响。通过SEM、XRD等分析方法对陶瓷层的组织结构及相组成进行了分析,并对陶瓷层的隔热性能及高温稳定性进行了测试。结果表明,与ZrO_2-Y_2O_3陶瓷层相比,Y_2O_3-ZrO_2-Y_2O_3陶瓷层表面由细小颗粒组成,涂层均匀、致密;锆钇盐体系陶瓷层形成了钇部分稳定锆的固溶体(Y_2O_3和Y_(0.15)Zr_(0.85)O_(1.93)□_(0.07)),并提高了反应温度;Y_2O_3-ZrO_2-Y_2O_3陶瓷层生长速度大于ZrO_2-Y_2O_3陶瓷层,其中向外生长厚度明显增大;另外,隔热性能得到提高。Y_2O_3-ZrO_2-Y_2O_3陶瓷层试样经400℃高温氧化处理,其氧化增重曲线呈对数规律,氧化增重量小,表明高温稳定性良好。
ZrO_2-Y_2O_3 ceramic coating and Y_2O_3-ZrO_2-Y_2O_3 ceramic coating were prepared on ZAl Sil_2Cu_3Ni_2 alloys by a modified plasma electrolytic oxidation（PEO） in zirconium salt solution and zirconium-yttrium salt solution,respectively. Microstructure,heatinsulating and high temperature oxidation properties of the coatings were investigated by SEM,XRD and a homemade heat insulation temperature testing device. The results show that the surface of the Y_2O_3-ZrO_2-Y_2O_3 ceramic coating is composed of fine particles and has lower roughness,and the coating is denser than that of the ZrO_2-Y_2O_3 ceramic coating. Yttrium partially stabilized zirconia solid solution（Y_2O_3 and Y_（0. 15）Zr_（0. 85）O_（1. 93）□_（0. 07）） are formed in the ceramic coating treated in zirconium yttrium salt solution with higher reaction temperature. The growth rate of the Y2O3-ZrO_2-Y_2O_3 ceramic coating is higher than that of the ZrO_2-Y_2O_3 ceramic coating. Especially,the outward growth improves obviously. Furthermore,the heat insulation property of the ceramic coating is enhanced. The curves of weight gains of the sample with Y_2O_3-ZrO_2-Y_2O_3 ceramic coating show a shape of logarithmic curve under the high temperature oxidation treatment of 400 ℃,and the weight gains of the sample with Y_2O_3-ZrO_2-Y_2O_3 ceramic coating is relatively lower than that of the ascoated sample. It indicates that the ceramic layer has good high temperature stability.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2016年第12期132-139,共8页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51401155
51475366)
陕西省自然科学基础研究计划(2015JQ5175)
国家重点基础研究发展计划(2012CB619602-3和2012CB619606-2)
