Fractional spraying process for solving debonding problem

The invention belongs to the field of spraying processes, and particularly relates to a graded spraying process for solving the debonding problem, in particular to a graded spraying process for solving the debonding problem of a resin type heat-proof coating and a rocket engine combustion chamber shell. The multi-time spraying process comprises the following steps that a base material is polished and cleaned, a primer is sprayed, and a pretreated base material is obtained; the pretreated base material is subjected to first spraying, curing, grinding and cleaning are sequentially conducted after first spraying is completed, and a first-time spraying base material is obtained; the primary spraying base material is subjected to secondary spraying, curing, grinding and cleaning are sequentially conducted after secondary spraying is completed, and a secondary spraying base material is obtained; and in the same way, spraying is conducted on the secondary spraying base material again till the target coating thicknes