Surface alloy coating composite material used for high temperature resistant material, coating and preparation method thereof

A method for manufacturing a coating, wherein the coating is made of a surface alloy coating composite material, wherein the surface alloy coating composite material is used for a thermal resistant material,

• wherein the surface alloy coating composite material is made of metal alloy powder with a face-centered cubic structure and enamel powder, and a component percentage thereof is as follows:
• 10-70 wt % is the metal alloy powder, and the remaining is the enamel powder;
• the metal alloy powder is at least one type selected from the group consisting of NiCrAIX, NiCrX and NiCoCrAIX, wherein the diameter of the metal alloy powder is 0.1 μm-15 μm, wherein X is at least one type of hafnium, zirconium, a rare earth element and mixed rare earth, and the mixed rare earth is two types or more than two types of rare earth elements that are used together, or a rare earth element and one type or multiple types of Na, K, Ca, Sr and Ba that are used in a combined way;
• the surface alloy coating composite material contains:
• 10 wt %˜40 wt % Cr, 0-30 wt % Al, 0.1 wt %˜5 wt % X, and the total amount of Cr, Al and X are 25 wt %˜45 wt %, wherein the amount of Co is no more than the amount of Ni,
• wherein the metal alloy powder or the metal alloy powder and a hardness-reinforcing phase are uniformly distributed in a base matrix made of the enamel powder to define a metal alloy-enamel coating, a metal alloy-enamel-hardness-reinforcing phase coating or a composite coating comprising a metal alloy-enamel coating and a metal alloy-enamel-hardness-reinforcing phase coating provided on the surface of an alloy, wherein the softening temperature of the base matrix made of the enamel powder is 600° C.-900° C., wherein the coefficient of thermal extension of the surface alloy coating composite material is 7.0×10−6K−′-12.0×10−6K−1,
• wherein the method for manufacturing the coating comprises the steps of:
• (A) mixing evenly the metal alloy powder and the enamel powder;
• (B) spray-coating the mixed powder on the surface of a component made of a material;
• and
• (C) treating the sprayed component made of the material under high temperature to form a thermal protection coating on the surface of the component, wherein the thermal protection coating is dense, smooth and continuous, wherein in the thermal protection coating, the metal alloy powder with a face-centered cubic structure is uniformly distributed in a substrate made of the enamel powder such that an interfacial reaction is capable of being processed between the metal alloy powder and the surface of the substrate to form a metallurgic bonding there between,
• wherein the component is pre-oxidized for 5 min-60 min under 600° C.-1000° C. in advance to form an oxide film on the surface of the component, before the mixed powder is sprayed on the surface of the component, wherein the thickness of the oxide film is 0.2 μm-2 μm.

A method for manufacturing the coating, wherein the coating is made of a surface alloy coating composite material,

• wherein the surface alloy coating composite material is used for a thermal resistant material, wherein the surface alloy coating composite material is made of metal alloy powder with a face-centered cubic structure and enamel powder, and a component percentage thereof is as follows:
• 10-70 wt % is the metal alloy powder, and the remaining is the enamel powder;
• the metal alloy powder is at least one type selected from the group consisting of NiCrAIX, NiCrX and NiCoCrAIX, wherein the diameter of the metal alloy powder is 0.1 μm-15 μm, wherein X is at least one type of hafnium, zirconium, a rare earth element and mixed rare earth, and the mixed rare earth is two types or more than two types of rare earth elements that are used together, or a rare earth element and one type or multiple types of Na, K, Ca, Sr and Ba that are used in a combined way;
• the surface alloy coating composite material contains:
• 10 wt %˜40 wt % Cr, 0-30 wt % Al, 0.1 wt %˜5 wt % X, and the total amount of Cr, Al and X are 25 wt %˜45 wt %, wherein the amount of Co is no more than the amount of Ni,
• wherein the face-centered cubic structure phase is partially replaced by a hardness-reinforcing phase, wherein the metal alloy powder is partially substituted by least one compound selected from the group consisting of alumina, quartz, ZrO2, Cr2O3, AlN, Si3N4, BN and SiC, wherein the amount of the substituted compound is no more than 30 wt %,
• wherein the metal alloy powder or the metal alloy powder and a hardness-reinforcing phase are uniformly distributed in a base matrix made of the enamel powder to define a metal alloy-enamel coating, a metal alloy-enamel-hardness-reinforcing phase coating or a composite coating comprising a metal alloy-enamel coating and a metal alloy-enamel-hardness-reinforcing phase coating provided on the surface of an alloy, wherein the softening temperature of the base matrix made of the enamel powder is 600° C.-900° C., wherein the coefficient of thermal extension of the surface alloy coating composite material is 7.0×10−6K−1-12.0×10−6K−1,
• wherein the method of manufacturing the coating comprises the steps of:
• (A) mixing evenly the metal alloy powder and the enamel powder;
• (B) spray-coating the mixed powder on the surface of a component made of a material;
• and
• (C) treating the sprayed component made of the material under high temperature to form a thermal protection coating on the surface of the component, wherein the thermal protection coating is dense, smooth and continuous, wherein in the thermal protection coating, the metal alloy powder with a face-centered cubic structure is uniformly distributed in a substrate made of the enamel powder such that an interfacial reaction is capable of being processed between the metal alloy powder and the surface of the substrate to form a metallurgic bonding therebetween,
• wherein in the step (C), the treating of the sprayed component made of the material under high temperature employs a heating method with variable heating rates:
• firstly, elevating the temperature up to 150° C.-250° C. by 3° C./min and then keeping the coated component under 150° C.-250° C. for 2 h-4 h so as to dehydrate the coating;
• secondly, elevating the temperature up to 800° C.-1100° C. by at least 20° C./min so as to avoid the crystallization temperature of the enamel and then keeping the coated component under 800° C.-1100° C. for 10 min-60 min;
• lastly, taking the component out of the heating furnace and cooling the component in still ambient air to room temperature.

A method for manufacturing the coating, wherein the coating is made of a surface alloy coating composite material,

• wherein the surface alloy coating composite material is used for a thermal resistant material, wherein the surface alloy coating composite material is made of metal alloy powder with a face-centered cubic structure and enamel powder, and a component percentage thereof is as follows:
• 10-70 wt % is the metal alloy powder, and the remaining is the enamel powder;
• the metal alloy powder is at least one type selected from the group consisting of NiCrAIX, NiCrX and NiCoCrAIX, wherein the diameter of the metal alloy powder is 0.1 μm-15 μm, wherein X is at least one type of hafnium, zirconium, a rare earth element and mixed rare earth, and the mixed rare earth is two types or more than two types of rare earth elements that are used together, or a rare earth element and one type or multiple types of Na, K, Ca, Sr and Ba that are used in a combined way;
• the surface alloy coating composite material contains:
• 10 wt %˜40 wt % Cr, 0-30 wt % Al, 0.1 wt %˜5 wt % X, and the total amount of Cr, Al and X are 25 wt %˜45 wt %, wherein the amount of Co is no more than the amount of Ni,
• wherein the face-centered cubic structure phase is partially replaced by a hardness-reinforcing phase, wherein the metal alloy powder is partially substituted by least one compound selected from the group consisting of alumina, quartz, ZrO2, Cr2O3, AlN, Si3N4, BN and SiC, wherein the amount of the substituted compound is no more than 30 wt %,
• wherein the metal alloy powder or the metal alloy powder and a hardness-reinforcing phase are uniformly distributed in a base matrix made of the enamel powder to define a metal alloy-enamel coating, a metal alloy-enamel-hardness-reinforcing phase coating or a composite coating comprising a metal alloy-enamel coating and a metal alloy-enamel-hardness-reinforcing phase coating provided on the surface of an alloy, wherein the softening temperature of the base matrix made of the enamel powder is 600° C.-900° C., wherein the coefficient of thermal extension of the surface alloy coating composite material is 7.0×10−6K−1-12.0×10−6K−1,
• wherein the method of manufacturing the coating comprises the steps of:
• (A) mixing evenly the metal alloy powder and the enamel powder;
• (B) spray-coating the mixed powder on the surface of a component made of a material;
• and
• (C) treating the sprayed component made of the material under high temperature to form a thermal protection coating on the surface of the component, wherein the thermal protection coating is dense, smooth and continuous, wherein in the thermal protection coating, the metal alloy powder with a face-centered cubic structure is uniformly distributed in a substrate made of the enamel powder such that an interfacial reaction is capable of being processed between the metal alloy powder and the surface of the substrate to form a metallurgic bonding therebetween,
• wherein the component is pre-oxidized for 5 min-60 min under 600° C.-1000° C. in advance to form an oxide film on the surface of the component, before the mixed powder is sprayed on the surface of the component, wherein the thickness of the oxide film is 0.2 μm-2 μm.