SU42265A1 - The method of obtaining castings with a solid surface layer - Google Patents

Description

According to the invention, to obtain

- castings hard. topfest mi

forms cover with a layer containing

 besides hard alloys or substances

forming them, also H-Tepj "HT,

To obtain castings with a solid surface layer, a mixture of carbides of rare metals Wg, I Cr, -Mo, Ti, Ta, -Mn, is prepared. Si, B and druid. | Any of the known solid alloys is used as the base material. As an example you can see | cook from the following materials:; hard alloy “Vokar or. Steel-: nit -85--96 ° / o, molasses-2-40 / 0, and the molasses is taken - in such a way, J, to get a mixture of the mixture from the mixture, metallic boron or arbid 6opa. and according to j

termites in the form of an aluminum shear powder and ok-isi. The prepared mixture of powders is thoroughly mixed and the required amount of molasses is poured into it, thereby forming a doughy mass, which is coated with internal chips, molds, or molds. The thickness of the coating layer is selected depending on the requirements. The bbm, az1nnuyu mold Il1T form is dried first at a lower temperature /, and then, at a higher, approximately 200-400 ° C, and is poured. liquid metal cast iron for steel, depending on casting / casting. is also produced at more than high temperatures. . .

When the mold is molded into the molded mold or the liquid metal form, touching the coating layer melts the latter, but since there are refractory carbides in the coating, the latter also melt the tepMHta in the same rbg smear, i.e. aluminum enters in reaction with iron oxide and; increases the temperature to 2900-3000, which allows the slurry to completely dissolve (melt) the plastering, after which the iron is reduced and aluminum, in the form of aluminum oxide, with slags, as light as specific, weighs through the layer of liquid metal to the walls of the mold. Thus, a casting with a solid surface crust is obtained. The introduction of the molasses causes the formation of additional carbides with rare metals; in addition, the molasses is given a binding liquid for the mixture of the coating. The introduction of boron causes obtaining more hard carbides than carbides W, Mo, etc., and the introduction of ter Mb9-td spat lacquerpacn,; iabenhlenie.d tears of plastering and temperature increase during the pouring of liquid metal-, tal. a viscous core, which is especially important for parts that require high resistance of their surfaces. Subject of defects, Eu. The method of obtaining from; 1 with a hard, surface layer by means of ani forms with gley, containing hard alloys. Forms, which differ, that in, the composition of this cm you enter termite

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