Infrared Radiation Coatings Fabricated by Plasma Spray
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JTTEE5 18:448–450 DOI: 10.1007/s11666-009-9321-6 1059-9630/$19.00 Ó ASM International
Infrared Radiation Coatings Fabricated by Plasma Spray Xudong Cheng, Wei Duan, Wu Chen, Weiping Ye, Fang Mao, Fei Ye, and Qi Zhang (Submitted August 21, 2008; in revised form March 21, 2009) Infrared radiation coatings were prepared by plasma spray on the copper sheet. The structure and emissivity were examined by x-ray diffraction and infrared radiant instrument, respectively. The results show that an appropriate addition of TiO2 (5-15 wt.%) to NiO and Cr2O3 leads to high emissivity of coating with (Cr0.88Ti0.12)2O3 and NiCr2O4 phase. However, more (20-30 wt.%) will frustrate the formation of NiCr2O4 and ultimately decrease the emissivity. Moreover, the coating prepared by plasma spray endures a long working time without emissivity decrease.
Keywords
emissivity, infrared radiation coating, plasma spray
1. Introduction Infrared radiation materials with high emissivity at high temperature have been widely used in many industrial applications such as energy savings for industrial furnaces (Ref 1-4), efficiency improvement of infrared heaters (Ref 5, 6), and spacecraft thermal control (Ref 7, 8). In these traditional applications, especially in industry furnaces, the infrared radiation materials, added with an amount of inorganic binder, were brushed onto the refractory furnace lining. The low adhesion strength between the coating and the metallic substrate and the bad thermal shock resistance restricted their application in the field of infrared radiation coatings of metal resistor tape, metal enclosures of hood-type annealing furnace, and others (Ref 9). Adhesion strength between the coating and the metallic substrate prepared by plasma spraying is much higher than one applied by the brush process obviously, because the plasma sprayed coating has a mechanical bond with the rough surface compared with the physical bond through the binder formed with the brush process. Plasma spray has been widely used in preparing wear-resistant coatings (Ref 10, 11), thermal barrier coatings (Ref 12, 13), abradable sealing coatings (Ref 14, 15), and so on. However, it is rare to find reports about preparing infrared radiation coating by plasma spraying. For this paper, the authors describe how they adopted plasma spraying to prepare infrared radiation coating.
Xudong Cheng, Wei Duan, Wu Chen, Weiping Ye, Fang Mao, Fei Ye, and Qi Zhang, State Key Laboratory of Advanced Technology for Materials Synthesis and Progressing, Wuhan University of Technology, Wuhan, China. Contact e-mails: [email protected] and [email protected].
448—Volume 18(3) September 2009
Spinel structure materials are the first choice for application in middle- and high-temperature areas at present (Ref 16-18) because of their high emissivity in the whole band and great thermal stability under high vacuum and high temperature. In our experiment, spinel structure NiCr2O4 is chosen as a basic material to study the structure and performance influence by the addition of TiO2.
2. Exper
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