With the incoming of HVOF, the coating properties and application extent of WC-Co type have been greatly improved, in the recent years, we found that the characteristics of WC-Co powder has some influence on its coating properties prepared by HVOF. In this paper, study has been prepared on powders made from aboard and Beijing General Research Institute of Mining & Metallurgy properties such as fluidity, aspect, profile of coating SEM and carbon content, also phase structure and properties analysis of HVOF coating has been made. Finally, influence of powder preparing technology and HVOF technology parameters of different powders for coating properties have been described.

High temperature alloy powder CoCrAlYTa made by vacuum-atomized technology has satisfied properties such as spherical degree, fluidity and low oxygen quantity etc. Compact and steady high temperature properties coating was prepared when CoCrAlYTa was blast sprayed onto stainless steel. In this paper, several high temperature working performance like hot shocking, high temperature oxidation and high temperature corrosion of CoCrAlYTa coating got was studied, the micro-structure of coating was analyzed with metallographical analysis, SEM and XRD. Experiments results indicated that, with the added of Y and Ta, the structure and toughness of chromium and aluminum oxidation membrane in the coating was improved, overall, blast spraying coating has excellent high temperature characteristics. Abstract only; no full-text paper available.