▎ 摘　　要

NOVELTY - A heat-protective composite coating comprises coating layers alternately set by ceramic heat-resistant layer and graphene heat-conducting layer (3). The thickness of heat-protective composite coating is d. First ceramic heat-resistant layer (1) comprising 70-80 wt.% ceramic powder and adhesive phase is coated on the base body surface for 20-40 minutes at 850-1100degrees Celsius, making it firmly combined with base body. The graphene heat conducting layer comprising 20-30 wt.% graphene powder, 40-60 wt.% ceramic powder, and bonding phase coated on the first ceramic heat-resistant layer, and heated for 25-35 minutes at 800-900degrees Celsius, making it tightly combined with first ceramic heat-resistant layer. A second ceramic heat-resistant layer (2) comprising 55-75 wt.% ceramic powder, 10-30 wt.% ceramic short fiber and balance adhesive phase is coated on graphene heat conducting layer and heated for 25-35 minutes at 750-800degrees Celsius, making heat conducting layer graphene tightly combined. USE - Heat-protective composite coating used for heat-resistant heat insulation in high temperature application structure. Can be used in the technical field of high temperature structural heat resistant protection. ADVANTAGE - The three-layer structure form of heat-resistant layer, heat-conducting layer, and heat resistant layer effectively solves the problem that the heat-protective coating material is caused by local high temperature aggregation in the actual application process, so as to effectively improve the stability and reliability of the high temperature application structure. The outermost layer of the ceramic coating realizes anti-ablation and anti-pneumatic flushing of the heat source, when the heat is continuously accumulated and introduced into the inner part through the opening. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation method of thermal protective composite coating. DESCRIPTION OF DRAWING(S) - The drawing shows the structure schematic diagram of the thermal protective coating. (Drawing includes non-English language text). First ceramic heat-resistant layer (1) Second ceramic heat-resistant layer (2) Graphene heat-conductive layer (3)