The invention discloses a preparation method for a wear-resisting and anti-friction
coating on a vermicular
graphite cast iron surface of a
cylinder head. The preparation method for the wear-resistingand anti-friction
coating on the vermicular
graphite cast iron surface comprises the following steps that firstly, vermicular
graphite cast iron after surface treatment is subjected to moderate pre-heat treatment; then a Co-based
alloy, Cr3C2 and MoS2
powder are mixed evenly and dried according to the proportion; the
laser cladding technology is used to deposit the dried
powder on the vermiculargraphite cast iron surface in the form of multi-channel overlap to form a Co-based
composite coating; and finally, the Co-based
composite coating is subjected to subsequent heat treatment to obtain awear-resisting and anti-friction cladding layer. The advantages are that the probability of peeling, separating and exfoliating can be greatly reduced by good metallurgical bonding, the damage to a matrix material is small, and the matrix deformation and
strength loss are smaller; a vermicular graphite cast iron matrix is subjected to pre-heat treatment so that the thermal stress can be effectively reduced, and thus the
crack initiation is controlled; the wear-resisting and anti-friction
coating prepared is subjected to subsequent heat treatment, so that
residual stress after
laser cladding isreduced and eliminated, and cracks in the using process of the coating are avoided; the coating prepared has excellent performance, both wear-resisting and anti-friction performance; and the claddingefficiency is high.