Thermal barrier coatings made by the solution precursor plasma spray process

被引:121
|
作者
Gell, Maurice [1 ]
Jordan, Eric H. [1 ]
Teicholz, Matthew [1 ]
Cetegen, Baki M. [1 ]
Padture, Nitin P. [2 ]
Xie, Liangde [3 ]
Chen, Dianying [1 ]
Ma, Xinqing [4 ]
Roth, Jeffrey [4 ]
机构
[1] Univ Connecticut, Inst Mat Sci, Dept Mat Sci & Engn, Storrs, CT 06269 USA
[2] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA
[3] Chromalloy Gas Turbine Corp, San Antonio, TX USA
[4] Inframat Corp, Farmington, CT USA
关键词
plasma spray; solution precursor; solution precursor plasma spray; thermal barrier coatings;
D O I
10.1007/s11666-007-9141-5
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The solution precursor plasma spray (SPPS) process is a relatively new and flexible thermal spray process that can produce a wide variety of novel materials, including some with superior properties. The SPPS process involves injecting atomized droplets of a precursor solution into the plasma. The properties of resultant deposits depend on the time-temperature history of the droplets in the plasma, ranging from ultra-fine splats to unmelted crystalline particles to unpyrolized particles. By controlling the volume fraction of these three different constituents, a variety of coatings can be produced, all with a nanograin size. In this article, we will be reviewing research related to thermal barrier coatings, emphasizing the processing conditions necessary to obtain a range of microstructures and associated properties. The SPPS process produces a unique strain-tolerant, low-thermal conductivity microstructure consisting of (i) three-dimensional micrometer and nanometer pores, (ii) through-coating thickness (vertical) cracks, (iii) ultra-fine splats, and (iv) inter-pass boundaries. Both thin (0.12 mm) and thick (4 mm) coatings have been fabricated. The volume fraction of porosity can be varied from 10% to 40% while retaining the characteristic microstructure of vertical cracks and ultra-fine splats. The mechanism of vertical crack formation will be described.
引用
收藏
页码:124 / 135
页数:12
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