SU818724A1

SU818724A1 - Composition for producing heat-insulation coating

Info

Publication number: SU818724A1
Application number: SU762351446A
Authority: SU
Inventors: Борис Семенович Линецкий; Михаил Иосифович Рябин; Виктор Алексеевич Ивлев; Илья Егорович Невский
Original assignee: Научно-Исследовательский Институтспециальных Способов Литья
Priority date: 1976-03-30
Filing date: 1976-03-30
Publication date: 1981-04-07

Description

Изобретение относитс к литейному производству, конкретно « теплонзол ционньш тгокрыти м дл литейных форм, преимущест1веЕНО металлических.The invention relates to a foundry, specifically, heat conglomeration for casting molds, preferably metal.

Покрытие предназначено дл нанесени на литниково-прибыльные системы кокилей .The coating is intended to be applied to casting-profitable systems of chill molds.

Известен состав смеси дл форм и стержней лить «з алюмидиевых сплавов, включающий кварцевый песок, глину, борную кислоту и воду при следующем соотнощении компонентов, вес. %:The known composition of the mixture for molds and rods is cast from aluminum alloys, including quartz sand, clay, boric acid and water in the following ratio of components, weight. %:

Песок кварцевыйОсноваQuartz sandBase

Глина10-17Clay10-17

Борна кислота15-23Borna acid15-23

Вода3-6 1.Water 3-6 1.

В приведенном составе борную кислоту используют в качестве св зующего дл повыщени механических свойств отливок. Да-нна комлозици дл получени покрытий использована быть не может.In the above formulation, boric acid is used as a binder to increase the mechanical properties of the castings. This combination cannot be used to produce coatings.

Наиболее близким по составу и технической сущности к изобретению из известных составов теплоизол ционных покрытий дл литейных форм вл етс покрытие, содержащее асбест хризотиловый, глинистую составл ющую, алюмофосфатное св зующее и воду при следующем соотношении компонентов, вес. %:The closest in composition and technical essence to the invention of the known compositions of heat insulating coatings for casting molds is a coating containing asbestos chrysotile, clay component, aluminophosphate binder and water in the following ratio of components, weight. %:

Асбест хризотиловый16Chrysotile asbestos16

Глиниста составл юща 12 Алюмофосфатное св зующее5 Вода Остальное 2.The clay component is 12 Aluminophosphate binder 5 Water Remaining 2.

Известное покрытие отличает относительно низка ИЗНОСОСТОЙКОСТЬ, что приводит к быстрому его истиранию и вызывает необходимость подкрашивани кокил до 4-5 раз iB смену. При этом увеличиваетс трудоем-кость обслуживани кокил , возникает расслоение покрыти и возрастание его теплопроводности.The known coating is distinguished by a relatively low wear resistance, which leads to its rapid abrasion and makes it necessary to tint the metal mold up to 4-5 times the iB shift. In this case, the labor-consuming maintenance of the chill mold increases, a separation of the coating and an increase in its thermal conductivity occur.

Последнее обсто тельство вызывает ухудшение качества получаемых отливок в св зи с ускоренной кристаллизацией металла в прибыльных част х.The latter circumstance causes a deterioration in the quality of the castings due to the accelerated crystallization of the metal in profitable parts.

Цель изобретени - повышение механической прочности покрыти и снижение его истираемости.The purpose of the invention is to increase the mechanical strength of the coating and reduce its abrasion.

Поставленна цель достигаетс тем, что в качестве св зующего состав покрыти содержит борную кислоту при следующем соотношении компонентов, вес. %:This goal is achieved by the fact that, as a binder, the coating composition contains boric acid in the following ratio, wt. %:

Асбест хризотиловый14-17Chrysotile asbestos14-17

Глиниста составл юща И-12 Борна кислота14-15Clay component I-12 Born acid14-15

Claims

Water the rest. A: Bentonite can be used as a clay component. The coating is made on heated equipment. When this occurs, the formation of a monolithic layer, which does not lose its strength properties during the repeated pouring of the molten metal and the extraction of the casting from the chill mold. Exemplary compositions for making the coatings according to the invention are shown in Table. 1. Table 1 The results of comparative tests for resistance to abrasion and strength of the compositions according to the invention and the known. (Prototype) are printed in Table. 2. Table 2 When comparing the known and proposed thermal insulation coatings for abrasion resistance and strength under standard conditions, the coating, including boric acid in the proposed amount, showed strength twice as high, and resistance to abrasion three times greater than that of the known . In this case, the number of tintings is reduced to 1 times per shift, and the consumption of coating per tint is reduced more than twice. With the release of 10,000 tons of castings, about 4,000 rubles are saved. only by reducing the consumption of coating. In addition, a decrease in the number of embellishments contributes to the rhythmic work and, ultimately, an increase in the output of the casting and the durability of the chill molds. A composition for producing a heat insulating coating for casting molds, containing asbestos chrysotile, a clay component that binds water, characterized in that, in order to increase the mechanical strength of the coating and reduce its abrasion, it contains boric acid as a binder in the ratio of components, weight. %: Chrysotile asbestos14-17 Glynist is 11-12 Born Xlot 14-15 Water Else. Sources of information taken into account during the examination: 1. USSR author's certificate No. 265E81, cl. B 22 C 3/00, 1968.

2. USSR author's certificate number 357023, cl. In 22 C 3/40, 1972 (prototype).