New method for manufacturing composite coating shell for precisely casting fusible patterns
A composite coating, precision casting technology, applied in casting molding equipment, casting molds, casting mold components, etc., can solve the problems of low precision, long production cycle, poor product quality, etc., to improve quality, high refractoriness, The effect of reducing production costs
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example 1
[0029] Example 1. Making composite coating shells for investment precision casting and pouring bronze handicrafts.
[0030] (1) Preparation of water-based ethyl silicate-silica sol mixed binder coating
[0031] 1) Preparation of water-based ethyl silicate binder mother liquor
[0032] Take 50ml of ethyl silicate, use 200g of 320 mesh silica powder refractory powder as dispersed coal, add 4ml of 1:1 hydrochloric acid aqueous solution prepared by 2ml of hydrochloric acid and 2ml of water under stirring, speed up the mixing, and the mixture changes instantaneously. Dry, then become thinner and accompanied by heat, and soon become a viscous slurry. At this time, the ethyl silicate has been fully hydrolyzed to make a water-based ethyl silicate binder mother liquor.
[0033] 2) Preparation of water-based ethyl silicate binder:
[0034] Take 1000ml of ethyl silicate and 100ml of water, first add most of the ethyl silicate to the above mother liquor and stir evenly, then add water a...
example 2
[0048] Example 2. Fabrication of cast low-alloy steel investment composite coating shell for precision casting
[0049] (1) Preparation of water-based ethyl silicate-silica sol mixed binder coating
[0050] 1) Preparation of water-based ethyl silicate mother liquor
[0051] Same example 1.
[0052] 2) Preparation of water-based ethyl silicate binder
[0053] Same example 1.
[0054] 3) Preparation of water-based ethyl silicate-silica sol mixed binder
[0055] Get as above-mentioned step 2) 1154ml water-based ethyl silicate binding agent of preparation, by following weight percentage:
[0056]
[0057] Immediately add 2308ml of silica sol, 269ml of absolute alcohol, 115ml of water, and 1.92ml of hydrochloric acid, and stir evenly to prepare a water-based ethyl silicate-silica sol mixed binder.
[0058] 4) Preparation of water-based ethyl silicate-silica sol mixed binder coating
[0059] Take water-based ethyl silicate-silica sol mixed binder 1000g, according to the wei...
example 3
[0067] Example 3. Making precision casting pouring stainless steel investment composite coating shell
[0068] (1) Preparation of water-based ethyl silicate-silica sol mixed binder coating
[0069] 1) Preparation of water-based ethyl silicate mother liquor
[0070] Same example 1.
[0071] 2) Preparation of water-based ethyl silicate binder
[0072] Same example 1.
[0073] 3) Preparation of water-based ethyl silicate-silica sol mixed binder
[0074] Get as above-mentioned step 2) 1154ml water-based ethyl silicate binding agent of preparation, by following weight percentage:
[0075]
[0076] Immediately add 1813ml of silica sol, 230ml of absolute alcohol, 99ml of water, and 0.99ml of hydrochloric acid, and stir evenly to prepare a water-based ethyl silicate-silica sol mixed binder.
[0077] 4) Preparation of water-based ethyl silicate-silica sol mixed binder coating
[0078] Get water-based ethyl silicate-silica sol mixed binder 1000g, press mixed binder: refractory ...
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