Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1620636 | Journal of Alloys and Compounds | 2009 | 9 Pages |
Abstract
Nano-scaled lanthanum zirconate powder prepared by co-precipitation-calcination method was plasma-sprayed into a thick coating on an alloy substrate. We investigated the thermophysical properties of the free-standing coating, including thermal conductivity and thermal expansion coefficients (TECs). Minimum value of the thermal conductivity (at 900 °C) of the coating was about 0.73 W mâ1 Kâ1, and the average TEC in the measurement range was about 9.45 Ã 10â6 Kâ1. Although the TEC value was similar to that of the bulk material, the change tendency versus temperature was different. After annealing at 1300 or 1400 °C for 50 h, we found that the heat insulation performance of the coating decreased with the heat treatment temperature, while the hardness and fracture toughness increased. A peak of sudden decrease in TEC value can be observed in the curve, and with increasing temperature, the peak shifted to high-temperature direction.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Hongfei Chen, Yanfeng Gao, Shunyan Tao, Yun Liu, Hongjie Luo,