Measuring Substrate Temperature Variation During Application of Plasma-Sprayed Zirconia Coatings
Measuring Substrate Temperature Variation During Application of Plasma-Sprayed Zirconia Coatings
复制标题
测量等离子喷涂氧化锆涂层施工过程中基材温度变化
DOI：
10.1007/s11666-007-9050-7
复制
发表时间：
2007
影响因子：
3.1
通讯作者：
E. Moran
中科院分区：
文献类型：
--
作者：
H. Salimijazi;L. Pershin;Thomas W. Coyle;J. Mostaghimi;S. Chandra;Y. Lau;L. Rosenzweig;E. Moran
采用嵌入不锈钢表面的快速响应热电偶测量了等离子喷涂ZrO 2 7%Y2O3粉末过程中基体温度的变化。涂层沉积与固定和移动的火炬。在涂层沉积开始时将基底保持在室温下或预热至270-300 °C。喷涂期间的峰值温度对于最初在室温下的表面达到450 °C，并且对于在涂层沉积之前预热至300 °C的表面达到680 °C。预热基板减少涂层孔隙率约40%。存款中心的孔隙率明显低于其周边，因为颗粒温度和速度在等离子体羽流的边缘低于沿着其轴向。当用移动的炬施加涂层时，基底温度不会增加到450 °C以上，在该温度下，到环境的热损失等于由等离子体羽流和颗粒提供的热。涂层孔隙率随着与基材的距离而降低。随着连续涂层的应用，表面温度升高，粗糙度降低。这两个因素都抑制了落在基材上的颗粒的破碎，从而降低了涂层孔隙率。
Substrate temperature variation was measured during plasma spraying of ZrO2 7% Y2O3 powder using fast-response thermocouples embedded in the stainless steel surface. Coatings were deposited with both stationary and moving torches. The substrate was either kept at room temperature at the start of coating deposition or pre-heated to 270-300 °C. Peak temperature during spraying reached 450 °C for a surface initially at room temperature, and 680 °C for a surface preheated to 300 °C before coating deposition. Preheating the substrate reduced coating porosity by approximately 40%. The porosity at the center of the deposit was significantly lower than that at its periphery since particle temperature and velocity were lower at the edges of the plasma plume than along its axis. When a coating was applied with a moving torch the substrate temperature did not increase above 450 °C, at which temperature heat losses to the ambient equalled the heat supplied by the plasma plume and particles. Coating porosity decreased with distance from the substrate. As sequential layers of coating are applied surface temperature increases and roughness decreases. Both of these factors suppress break-up of particles landing on the substrate and thereby reduce coating porosity.