This paper discussed influences of flow rates of O_2, C_3H_8, and compressedair on the melting degree of particles during HVOF (high velocity oxy-fuel) sprayed CoCrW coating.The O_2 flow rate has the maximal effect on...This paper discussed influences of flow rates of O_2, C_3H_8, and compressedair on the melting degree of particles during HVOF (high velocity oxy-fuel) sprayed CoCrW coating.The O_2 flow rate has the maximal effect on the melting of particles, the C_3H_8 flow rate has thesecond, and the compressed air flow rate has the minimal effect. The bond strength of the HVOFsprayed CoCrW coating is over 54 MPa. The porosity ratio of the HVOF sprayed CoCrW coating afteroptimization of gas flow rates is less than 2%. The average microhardness of the coating is up toHV_(0.1) 545. The oxidation amount per unit area of the HVOF sprayed CoCrW coating increases withthe holding time increasing at 800℃. In the same way, the oxidation amount of the coating increasesas the temperature increases. Particularly, the oxidation of the coating drastically increases over850℃.展开更多
文摘This paper discussed influences of flow rates of O_2, C_3H_8, and compressedair on the melting degree of particles during HVOF (high velocity oxy-fuel) sprayed CoCrW coating.The O_2 flow rate has the maximal effect on the melting of particles, the C_3H_8 flow rate has thesecond, and the compressed air flow rate has the minimal effect. The bond strength of the HVOFsprayed CoCrW coating is over 54 MPa. The porosity ratio of the HVOF sprayed CoCrW coating afteroptimization of gas flow rates is less than 2%. The average microhardness of the coating is up toHV_(0.1) 545. The oxidation amount per unit area of the HVOF sprayed CoCrW coating increases withthe holding time increasing at 800℃. In the same way, the oxidation amount of the coating increasesas the temperature increases. Particularly, the oxidation of the coating drastically increases over850℃.
