SU1398977A1 - Composition for obtaining antistick coating on moulds and cores - Google Patents

Abstract

The invention relates to foundry, in particular, to the manufacture of casting molds in the production of iron castings. The purpose of the invention is to develop antiburning properties, reduce the cost of coating and utilize waste. The composition for producing a nonstick coating on casting molds and cores contains, wt%: a graph of cKf iTO-crystalline 5-30; insoluble residue in the production of zirconia 20-50; bentonite 3-5; organic binder 1-8; suspending agent 2-5, water - the rest. The insoluble residue in the production of zirconium dioxide includes, wt.%: Zirconia 15-30, silica 25-, 35, hafnium dioxide 1-2, titanium dioxide 1-2, uderode the rest. The coating is prepared by mixing 1 {and the components in a mixer and diluting with water in a paddle gage to the required density. The use of an insoluble residue in the production of zirconium dioxide contributes to an increase in antiburning properties, reducing the cost of coating and recycling of waste. 1 hp f-ly, 2 tab. from 9 (I

Description

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The invention relates to foundry, in particular to the manufacture of foundry Lorm. in the production of black Huns castings.

The purpose of the invention is to increase the anti-stick properties of the coating, reducing the cost of coating and recycling.

The composition of the day of the preparation of the anti-frit coating contains the following components, wt%:

Cryptocrystalline graphite5-30

Insoluble residue

in the production of zirconium dioxide 20-50 bentonite 3-5

Binding1-8

Suspension Composite

 nent2-5

: WaterErest

At the same time, the insoluble residue in the production of zirconia has the following composition, wt%: Zirconia 15-20 Silica 25-35 Hafnium dioxide 1-2 Titanium dioxide 1 - 2

Carbon

Rest

This composition of the insoluble residue is provided by the main production technology of zirconia (OST 48-82-82). The insoluble residue is a byproduct resulting from the filtration of the chlorination products, the zircon concentrate.

For delivery to consumers, the residue thus obtained is dried to a moisture content of less than 1%.

The introduction of this material increases the antiburning properties of the coating, since it contains zirconium, titanium and hafnium oxides, which are chemically inert with respect to metal oxides. The presence of carbon in the material contributes to the creation of a reducing atmosphere in the form and reduces the wettability of the form by the melt.

The coating according to the invention is prepared by mixing its ingredients in a mixer and diluting it with a water in a paddle jig to the required density.

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The coating on the substrate is made by brush, spray or dipping.

In tab. 1 and 2 shows the composition and properties of the composition.

Technological properties of the manufactured coatings were evaluated according to the methods according to GOST 10772-78, and anti-burn properties on the technological sample.

From the data table. 2, it follows that the technological properties of the coating according to the invention (compositions 2-4, 6-7) are on par with the known, but the anti-adhesive properties of the coating according to the invention are better than that of the known coating. The optimum content of the insoluble residue in the coating was found to be 20-50% by weight (compositions 2-4, 6.7).

Thus, the use of an insoluble residue as a refractory filler in the production of dioxide and 1rconium leads to an increase in antiburning properties, a decrease in the cost of coating by reducing the consumption of cryptocrystalline graphite, as well as recycling of waste.

Claims (2)

1. A composition for producing a nonstick coating on casting molds and cores in the production of iron castings, including cryptocrystalline graphite, refractory filler, bentonite, organic binding agent, suspending agent, and water, characterized in that, in order to improve antiburning properties, reduce the cost of coating and waste, the composition contains as a refractory filler insoluble residue in the production of zirconium dioxide in the following ratio of ingredients, wt.%: Cryptocrystalline graphite5-30 Insoluble residue in the production of zirconia 20-50 Bentonite3-5 Organic binder 1-8 Suspension agent 2-5 Water Else 2. Composition POP.1, characterized in that the insoluble residue in the production of zirconia has the following composition, wt.%: zirconium silicon hafnium titanium I 5-30 25-35 1-2 1-2 Else Table 1 Cryptocrystalline graphite Quartz pulverized Insoluble residue in the production of zirconia Bentonite Binder a) starch b) VAT residue produced by Na-KMTSLignosulfonates technical Water. Note, In compositions 1 and 5 used insoluble residue with the production of zirconia with a maximum content of zirconia, silicon dioxide, hafnium and titanium; in compositions 3 and 5 - with a minimum content of zirconium, silicon, hafnium and titanium dioxides; in compositions 2 - with the following ingredients: zirconia 22.3, silicon dioxide 30.5, hafnium dioxide 1.7, titanium dioxide 1.6, carbon 43.9. Table 2 18 thirty 50 3 20 3 50 3 A 38 3 37 5 2 40 8 2 32 Svaris g and nonstick coating The compositions .: ll1..11.1.p; abrasion resistance, kg / mm22222 Surface quality castings (technological samples) The surface is clean without burning Continued table. 2 The compositions