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A kind of preparation method of boron carbide/aluminum composite coating
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A boron carbide and aluminum composite technology, which is applied in coatings, metal material coating processes, shielding, etc., can solve the problems of inconvenient preparation methods for boron carbide/aluminum composite coatings, and achieve improved wettability and binding force, preparation The effect of simple process and low cost
Active Publication Date: 2018-06-15
ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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Problems solved by technology
[0004] Therefore there is above-mentioned inconvenience and problem in the preparation method of known boron carbide / aluminum composite coating
Method used
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Embodiment 1
[0022] A preparation method of boron carbide / aluminum composite coating, comprising the following steps:
[0023] (1) dissolving 10% boric acid powder in 90% hot water by mass percentage to obtain boric acid aqueous solution;
[0024] (2) Add boron carbide powder to the above boric acid aqueous solution to obtain powder colloid, put the powder colloid in a ball mill for ball milling for 6 hours, the speed of the ball mill is 500r / min, and dry the powder colloid after ball milling in a hot air blower at 80°C for 1 hour , to obtain boron carbide spray powder;
[0025] (3) The above-mentioned spraying powder is sprayed onto the surface of the metal substrate by plasma spraying;
[0026] (4) Place an Al-Si alloy block on the surface of the obtained coating, the mass content of Si in the alloy is 12%, heat it in a vacuum furnace to 850 ° C for 0.5h, and impregnate the Al-Si alloy into the coating after melting In the pores; cleaning excess aluminum alloy material on the surface o...
Embodiment 2
[0028] A preparation method of boron carbide / aluminum composite coating, comprising the following steps:
[0029] (1) dissolving 15% boric acid powder in 85% hot water by mass percentage to obtain boric acid aqueous solution;
[0030] (2) Add boron carbide powder to the above boric acid aqueous solution to obtain powder colloid, put the powder colloid in a ball mill and mill for 5 hours, the speed of the ball mill is 400r / min, and the powder colloid after ball milling is kept in a hot air blower at 80°C for 1 hour and dried , to obtain boron carbide spray powder;
[0031] (3) The above-mentioned spraying powder is sprayed onto the surface of the metal substrate by plasma spraying;
[0032] (4) Place an Al-Mg alloy block on the surface of the obtained coating, the mass content of Mg in the alloy is 10%, heat it to 800°C for 1h in a vacuum furnace, and the Al-Mg alloy is infiltrated into the coating after melting In the pores; the excess aluminum alloy material on the surface ...
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Abstract
A preparation method of a B4C (boron carbide) / aluminum composite coating is characterized by comprising steps as follows: a, boric acid powder with the mass percentage being 10%-15% is dissolved in hot water with the mass percentage being 85%-90%, and a boric acid aqueous solution is obtained; b, B4C powder is added to the boric acid aqueous solution, and powder colloid is obtained; c, B4C spraying powder is sprayed to the surface of a metal matrix through a vacuum plasma spraying technology; d, Al-Si or Al-Mg alloy blocks or powder is placed on the surface of a coating obtained in the step c, and the aluminum alloy and B4C composite coating is obtained. The method has the advantages that the surface-modified B4C powder is sprayed onto the surface of the matrix, then pores of the coating are filled with an aluminum alloy, the wettability and the binding force of the aluminum alloy and B4C ceramic are improved, the B4C / aluminum composite coating which is fully dense and is firmly combined with the matrix is obtained, the preparation technology is simple, high in efficiency and low in cost, and industry enlargement is easy to perform.
Description
technical field [0001] The invention belongs to the technical field of radiation protection, and relates to a preparation process of a boron carbide / aluminum composite material, in particular to a preparation method of a boron carbide / aluminum composite coating. Background technique [0002] Boron carbide is an excellent structural ceramic material, which has the advantages of light weight, wear resistance, etc., and has a high neutron absorption capacity, and is an ideal neutron absorbing material. Boron carbide has poor oxidation resistance, especially poor resistance to atomic oxygen corrosion. Combining boron carbide with aluminum alloy, combining the oxidation resistance of aluminum alloy with the wear resistance and nuclear radiation resistance of boron carbide, and preparing it into a composite coating and coating it on the surface of some specific components, it will become a good A material with comprehensive protective properties. [0003] Chinese patent CN200810...
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