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High-temperature-resistant low-expansion precoated sand and preparation method thereof

A low-expansion, coated sand technology, used in manufacturing tools, casting equipment, metal processing equipment, etc., can solve problems such as poor heat resistance, easy expansion when heated, and achieve improved surface quality, good high temperature resistance, and good resistance to heat. The effect of sticky sand properties

Inactive Publication Date: 2014-02-12
TONGLING JINGWEI FLUID SCI & TECH
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Problems solved by technology

[0003] The object of the present invention is to improve a kind of high-temperature-resistant low-expansion coated sand and its preparation method for the problems of poor heat resistance and easy expansion when heated in the prior art.

Method used

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Embodiment Construction

[0011] A kind of high-temperature-resistant and low-expansion coated sand, made of the following raw materials in weight (kg): mullite 65, corundum powder 20, coke gem 15, iron oxide red 2.5, aluminum silicate fiber 4, cashew oil modified phenolic Resin 2, urotropine 10, beryllium oxide 1.5, glyceryl monostearate 6, nano silicon carbide 3, coal tar 4, molybdenum disulfide 2, cyclomethicone 1, composite powder 4;

[0012] The preparation method of the composite powder is as follows: a, take pyrophyllite, bauxite and volcanic rock in a weight ratio of 3:3:2 and mix evenly, pulverize through a 300 mesh sieve, then place a concentration of 15% in hydrochloric acid solution, heat Boil and grind at high speed for 10 minutes, then adjust the pH of the solution to neutrality with 18% sodium hydroxide solution, stir for 8 minutes at 65°C in a water bath, filter, wash the filter residue with distilled water, and dry; b. Add water and beat the powder to make a slurry with a solid con...

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Abstract

The invention discloses high-temperature-resistant low-expansion precoated sand and a preparation method thereof. The high-temperature-resistant low-expansion precoated sand is prepared from the following raw materials in parts by weight: 55-75 parts of mullite sand, 20-30 parts of corundum powder, 10-15 parts of flint clay, 2-3 parts of iron oxide red, 3-6 parts of alumina silicate fibre, 1-3 parts of cashew nut oil modified phenolic resin, 8-12 parts of urotropine, 1-2 parts of beryllium oxide, 5-8 parts of glycerin monostearate, 2-4 parts of nano silicon carbide, 3-6 parts of coal tar oil, 1.5-2.5 parts of molybdenum disulfide, 1-2 parts of cyclomethicone and 3-5 parts of composite powder. The high-temperature-resistant low-expansion precoated sand has high strength, good high temperature resistance and low thermal expansion rate and also has good sand burning resistance and crack resistance, surface quality of a casting is improved, and the high-temperature-resistant low-expansion precoated sand is applicable to steel casting with high requirements.

Description

technical field [0001] The invention relates to a high-temperature-resistant and low-expansion coated sand and a preparation method thereof, belonging to the technical field of molding sand. Background technique [0002] Coated sand refers to the molding sand or core sand whose surface is covered with a layer of solid resin film before molding. Coated sand used to make sand cores has the characteristics of simple core-making process, high production efficiency, fast hardening response, small deformation, high precision, no core creep, and long-term use. It is widely used in steel castings, Iron castings. However, there are also shortcomings, such as poor heat resistance, easy expansion when heated, etc., and castings are prone to defects and problems such as sand sticking and cracks. Therefore, the performance of the existing coated sand must be improved to meet the production needs. Contents of the invention [0003] The purpose of the present invention is to improve a...

Claims

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Application Information

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IPC IPC(8): B22C1/00
Inventor 吴寿涛
Owner TONGLING JINGWEI FLUID SCI & TECH
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