| The advantage of hot spraying technology is high efficiency and wide selecting suitable materials, it can get form coating on big work piece, which are other surface technology can't be obtained. It has extensive application in industry in hot spraying technology. But particle hot spraying coating of technology rely on mechanically physics combined mainly. Layer structure of hot spraying coating and not-too-high bonding strength unit its application under harsh circumstance. Also the interface is the first abate position. During the form of hot spraying coating bonding strength between the material and coating is the key problem.When Ni and A1 powder is mixed without reaction, by means of the traditional oxygen - the acetylene flame powder spraying equipment Ni-A1 powder on Q235 and heat treatment with H2 as protection atmosphere, Utilize OM, SEM, EDX, etc. have observed to the coating interface, research , analysing, combine to coating interface intensity raise factor act as comprehensive research; In order to expounded the mechanism which coating combine is strengthened under middle temperature treatment, utilize pure iron surface after oxidizing and reduce reaction under middle temperature.Have observed the self-healing of the microcrack and reduced the crystallization shape on Fe surface of Fe atom produced directly. The mechanism is opened which strengthens coating associatively under middle temperature treatment. The main result of this research is as follows,<1> Ni-Al coating middle temperature treated interface combine intensity obviously higher than the routine coating; It is about 10μm that there are the interfaces Ni-Fe solution area, and appear divide metallurgy combine on interface: It is shown that HV on the interface is obviously higher than that of the substrate and the coating by 20HV. The results...
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