A method for reactive cladding of alumina-based coating on the surface of a casting
Active Publication Date: 2015-09-09
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
[0002] Wear, especially wear at high temperature, is one of the main failure factors of parts, which leads to frequent replacement of workpieces or frequent maintenance of production lines, resulting in huge energy consumption and economic losses
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Embodiment 1
[0017] (1) Weigh 6.0kg of nickel monoxide powder with an average particle size of 20-25μm, 1kg of aluminum powder of 45μm, 2kg of aluminum oxide powder of 45μm and metal powder of 45μm (Ni: 60wt%, Cr: 4wt%, Si: 5wt%) , B: 3wt%, Fe: 10wt%, all the other are copper) 1.5kg, mixed in ball mill for 8 hours;
[0018] (2) Add 750g of polyvinyl alcohol aqueous solution of 3wt% in mixed powder, stir and make paste coating;
[0019] (3) Apply the paste paint on the designated position on the surface of the EPS plastic foam mold, that is, the position where the friction and wear of the casting occurs. The thickness of the coating layer is 4 mm, and it is placed in an environment of 50 ° C and dried for 3 hours;
[0020] (4) hanging 3 mm thick magnesia powder anti-sticking sand coating on the mold obtained in step 3), and placing it in a 60° C. environment to dry for 4 hours;
[0021] (5) Buried sand for vibration molding, and vacuumed the sand box with a vacuum degree of 0.07MPa. Melted...
Embodiment 2
[0024] (1) Weigh 6.0kg of iron oxide powder with an average particle size of 20-25 μm, 2kg of aluminum powder of 45 μm, 2kg of aluminum oxide powder of 45 μm and metal powder of 45 μm (Ni: 60wt%, Cr: 4wt%, Si: 5wt%, B: 3wt%, Fe: 10wt%, all the other are copper) 1.5kg, mixed in ball mill for 8 hours;
[0025] (2) Add 750g of polyvinyl alcohol aqueous solution of 3wt% in mixed powder, stir and make paste coating;
[0026] (3) Apply the paste paint on the designated position on the surface of the EPS plastic foam mold, that is, the position where the friction and wear of the casting occurs. The thickness of the coating layer is 4 mm, and it is placed in an environment of 50 ° C and dried for 3 hours;
[0027] (4) hanging 3 mm thick magnesia powder anti-sticking sand coating on the mold obtained in step 3), and placing it in a 60° C. environment to dry for 4 hours;
[0028] (5) Buried sand for vibration molding, and vacuumed the sand box with a vacuum degree of 0.07MPa. Melted pu...
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Abstract
A method for reacting and cladding an alumina-based coating on the surface of a casting belongs to the technical field of metal-based composite material preparation. The method comprises the steps of firstly preparing coating powder including self-propagating reaction system powder and metal additive powder; then, adding a polyvinyl alcohol solution for stirring, mixing the reacting coating powder into paste, coating on the surface of an EPS (Expandable Polystyrene) appearance, drying after painting fireproof paint, and finally burying and casting to obtain the alumina-based coating. The method has the characteristic that the self-propagating reaction can be triggered through cast heat, the outside pollution and inclusion can be avoided due to in-situ formation of the product, and the mechanical and physical properties can be guaranteed; the product is a melt due to high temperature of released heat, the compactness of the coating and the binding strength of an interface can be ensured by cladding on the surface of metal, and the reacting and cladding alumina-based coating with good performance can be prepared.
Description
technical field [0001] The invention belongs to the technical field of metal-based composite material preparation, and in particular relates to a method for preparing an alumina-based reactive cladding coating. technical background [0002] Wear, especially wear at high temperature, is one of the main failure factors of parts, which leads to frequent replacement of workpieces or frequent maintenance of production lines, resulting in huge energy consumption and economic losses. At present, the main method to alleviate the impact wear of parts under severe working conditions is the surface coating technology, which has the great advantage of low cost and high performance. [0003] Alumina ceramics have a Mohs hardness of 9, high hardness, high melting point, high corrosion and wear resistance, and stable performance at high temperatures, which can be used as an ideal surface coating. In ceramic-lined steel pipes, alumina-based coatings have been widely used with excellent per...
Claims
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