Hexagonal boron nitride type mold shell investment precoat for precision casting of magnesium alloy investment
A boron nitride type and boron nitride micropowder technology, which is applied in casting molding equipment, casting molds, casting mold components, etc., can solve the problems of poor surface quality and low reactivity of castings, and achieve high surface strength and high surface finish. , the effect of good air permeability
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Embodiment 1
[0025] In this embodiment, the preparation of the hexagonal boron nitride shell surface coating for magnesium alloy precision casting is achieved through the following steps:
[0026] 1) Add 100kg of silica sol, 5kg of deionized water and 100g of bactericide to the mixing machine, and slowly start the mixing machine for mixing;
[0027] 2) Add 600kg of hexagonal boron nitride powder of 200 mesh to 325 mesh gradually into the slurry mixing tank under stirring conditions, and assisted by manual stirring, so that the hexagonal boron nitride powder is completely dispersed in the silica sol and passed through ice The water machine controls the temperature of the paint so that the temperature does not exceed 26.7℃;
[0028] 3) Mix 20kg of polyvinyl acetate emulsion, 100g of wetting and dispersing agent, and 50g of defoaming agent in another mixing tank: first add the polyvinyl acetate emulsion, then slowly add the wetting and dispersing agent and defoaming agent, stirring to 3-5 minutes i...
Embodiment 2
[0032] In this embodiment, the production of the stainless steel precision casting mold shell surface layer is realized through the following steps:
[0033] 1) Add 100kg of silica sol, 7.5kg of deionized water and 125g of bactericide to the mixing machine, and slowly start the mixing machine for mixing;
[0034] 2) Add 500kg of hexagonal boron nitride powder of 200 mesh to 325 mesh gradually into the slurry mixing tank under stirring conditions, and assisted by manual stirring, so that the hexagonal boron nitride powder is completely dispersed in the silica sol and passed through ice The water machine controls the temperature of the paint so that the temperature does not exceed 26.7℃;
[0035] 3) Mix 25kg of polyvinyl acetate emulsion, 125g of wetting and dispersing agent and 75g of defoaming agent in another mixing tank: first add the polyvinyl acetate emulsion, and then slowly add the wetting and dispersing agent and defoaming agent. Too fast, otherwise it will cause the solution...
Embodiment 3
[0039] In this embodiment, the production of the stainless steel precision casting mold shell surface layer is realized through the following steps:
[0040] 1) Add 100kg of silica sol, 10kg of deionized water and 150g of bactericide to the mixing machine, and slowly start the mixing machine for mixing;
[0041] 2) Add 400kg of hexagonal boron nitride powder of 200 mesh to 325 mesh gradually into the slurry mixing tank under stirring conditions, and assisted by manual stirring, so that the hexagonal boron nitride powder is completely dispersed in the silica sol and passed through ice The water machine controls the temperature of the paint so that the temperature does not exceed 26.7℃;
[0042] 3) Mix 30kg of polyvinyl acetate emulsion, 150g of wetting and dispersing agent and 100g of defoaming agent in another mixing tank: first add the polyvinyl acetate emulsion, and then slowly add the wetting and dispersing agent and defoaming agent. Too fast, otherwise it will cause the solution...
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