The frictional properties of 12Kh18N10T steel with boride coatings at high temperatures in vacuum

The purpose of this work was to determine the frictional properties of 12Kh18N10T steel with boride coatings under conditions of operation of a friction assembly at high temperatures in vacuum. Since in boriding austenitic steels it is not possible to obtain diffusion layers strongly adhering to the base with a thickness of more than 8-10 /mu/m, the boriding was done after preliminary iron impregnation of the samples. The adhesive interaction of borided steel in contact with unprotected steel was investigated in a vacuum of 2.7 mPa at 700-1100/degree/C with a load of 30 MPa and a contact time of up to 4 h. It is concluded that boriding with preliminary iron diffusion of 12Kh18N10T steel makes it possible to obtain dense layers strongly adhering to the base and of significant thickness (up to 50 /mu/m), reducing the tendency of the steel to seizing at high temperatures in vacuum.