A NEW PRINCIPLE OF COATING self-fluxing alloys WILL IMPROVE PROPERTIES OF METAL PARTS
In the Research and Production Companies Uralaviaspetstehnologiya developed thermal spray coating technology methods, in particular to the thermal spray coating of Ni-Cr-B-Si on the details of the martensite steels followed by heat treatment. New methods of coating will increase the hardness of the coating and base material, and to improve the properties of the operational components.
Until now, the coating of steel parts, including thermal spraying, it was not possible to solve the problem to prevent cracking and increasing the hardness of the coating and base material parts that would strengthen the operational properties of the coating and the details of the whole.
This problem was solved by the Scientific and Production Companies Uralaviaspetstehnologiya. Their technology basis in that preheating is carried out first to 400 parts 500C, melting in the air and subsequent heat treatment which, in contrast to the existing methods is carried out in two steps - first parts kept at a temperature of 50-150C below the martensite start temperature conversion in 1-2 h, and then the temperature was raised at a heating rate 8-12 ° C / min to a value corresponding to the maximum speed austenite decomposition process. After allowed to stand for 2-3 hours, then cooled to room temperature at a rate of 1-2 ° C / min.
During the test parts with the new coating, after melting at 200-220 | C they showed increased hardness of the coating as well as the base material. The subsequent release of details at 670-690oS to reduce the level of residual stress as a result of the uneven heating phase hardening and the difference of the coefficients of thermal expansion of the base material and coating.
The new coating technology in comparison with known analogs provides elimination of cracking of the coating, increasing the hardness of the coating and base material, and also improves the properties of the operational components.
Contact information:
450039, Ufa, ul. Rural-Bogorodskaya, 2, OOO NPP Uralaviaspetstehnologiya
Tel. / Fax: (3472) 38-16-59, 38-16-81, 00-14-82, E-mail: ion_usatu@mail.rb.ru
