| GAO Hai-dong,WANG Ze-hua,SHAO Jia.Research Progress in Composite Coatings Prepared by Self-propagating High Temperature Synthesis[J],45(4):31-39 |
| Research Progress in Composite Coatings Prepared by Self-propagating High Temperature Synthesis |
| Received:December 01, 2015 Revised:April 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.04.006 |
| KeyWord:self-propagating high temperature synthesis composite coating ceramic coating self-propagating high temperature synthesized coating gradient coating |
| Author | Institution |
| GAO Hai-dong |
College of Mechanics and Materials, Hohai University, Nanjing , China |
| WANG Ze-hua |
College of Mechanics and Materials, Hohai University, Nanjing , China |
| SHAO Jia |
College of Mechanics and Materials, Hohai University, Nanjing , China |
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| Abstract: |
| Self-propagating high temperature synthesis (SHS) has many advantages, such as energy saving, high efficiency, low investment of production, and high product purity. It is one of the potential methods to fabricate high-performance ceramic/ metal composite coatings with some special properties. A series of self-propagating high temperature coating synthesis technologies have been developed based on the principle of SHS technology, such as self-propagating casting coating technology, self-propaga-ting gas-transmission coating technology, self-propagating sintered coating technology and self-propagating reactive thermal spraying coating technology. The basic principle, process features, coating characteristics, applications, research status and existing problems of the SHS coating technologies were introduced and reviewed. Focusing on the problems of SHS coating, such as high porosity (up to 5% to 20% ); low bonding strength ( <50 MPa), too fast reaction process, and difficult to be controlled, some research directions of SHS coating were proposed. The reaction system should be optimized to avoid the formation of the reacted product with low vaporization point and to reduce splashing during self-propagating synthesis process. Some additives could be used in the reaction system to extend the residence time of the liquid phase and to enhance liquidity of the reacted product. A good wettability between the reacted phases and phases, as well as coating and metal substrate is essential, and it must be considered seriously. In order to improve the binding quality of coating and metal substrate, composite coating and gradient coating should be employed by optimizing the coating structure design. |
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