Method for manufacturing specially-shaped sprue cup by colloidal forming

A colloidal molding and sprue cup technology, which is applied in the field of refractory materials, can solve the problems of affecting product quality, low strength, and high cost, and achieve the effects of shortening the production cycle, high strength, and low cost

Active Publication Date: 2014-11-12
LIAONING SILICATE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of high cost and low strength of the sprue cup formed by the traditional press, and due to the long-term use of the steel mold for pressing, the wear and tear is serious, and a large amount of impurities on the mold will be introduced, which seriously affects the product quality. and other technical problems, a method for preparing special-shaped sprue cups by colloidal molding for precision casting is proposed

Method used

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  • Method for manufacturing specially-shaped sprue cup by colloidal forming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The ceramic powder raw material adopts an average particle size of 1 micron. Prepare 1000ml monomer solution premix, mass ratio: 10% acrylamide monomer; 1% N,N-methylenebisacrylamide crosslinking agent; 2% polyacrylamide dispersant; 87% deionized water.

[0026] Prepare a slurry with a mass solid content of 60%, and ball mill and mix for 2 hours.

[0027] The catalyst tetramethylethylenediamine and the initiator ammonium persulfate were respectively added in an amount of 0.2% of the above slurry, then vacuum stirred and degassed for 15 minutes, then poured into a mold, and kept at 80° C. for 30 minutes. The mold is placed at room temperature, and after the mold is cooled, the mold is demoulded to obtain a sprue cup green body.

[0028] Put the green body in a constant temperature and humidity box with a humidity of 90%, until the green body no longer shrinks, then transfer it to an oven, and dry it in the air at 40, 60, 80 and 100 °C for 4 hours each to obtain a hard ...

Embodiment 2

[0030] The ceramic powder raw material adopts an average particle size of 1 micron. Prepare 1000ml monomer solution premix, mass ratio: 5% acrylamide monomer; 0.25% N,N-methylenebisacrylamide crosslinking agent; 4% polyacrylamide dispersant; 90.75% deionized water.

[0031] Prepare a slurry with a mass solid content of 70%, and ball mill and mix for 2 hours.

[0032] The catalyst tetramethylethylenediamine and the initiator ammonium persulfate were respectively added in an amount of 0.05% of the above slurry, then vacuum stirred and degassed for 15 minutes, then poured into a mold, and kept at 80°C for 30 minutes. The mold is placed at room temperature, and after the mold is cooled, the mold is demoulded to obtain a sprue cup green body.

[0033] Put the green body in a constant temperature and humidity box with a humidity of 90%, until the green body no longer shrinks, then transfer it to an oven, and dry it in the air at 40, 60, 80 and 100 °C for 4 hours each to obtain a ha...

Embodiment 3

[0035] The ceramic powder raw material adopts an average particle size of 1 micron. Prepare 1000ml monomer solution premix, mass ratio: 15% acrylamide monomer; 0.75% N,N-methylenebisacrylamide crosslinking agent; 0.4% polyacrylamide dispersant; 83.85% deionized water.

[0036] Prepare a slurry with a mass solid content of 80%, and ball mill and mix for 2 hours.

[0037] The catalyst tetramethylethylenediamine and the initiator ammonium persulfate were respectively added in an amount of 0.15% of the above slurry, then vacuum stirred and degassed for 15 minutes, then poured into a mold, and kept at 90° C. for 30 minutes. The mold is placed at room temperature, and after the mold is cooled, the mold is demoulded to obtain a sprue cup green body.

[0038] Put the green body in a constant temperature and humidity box with a humidity of 90%, until the green body no longer shrinks, then transfer it to an oven, and dry it in the air at 40, 60, 80 and 100 °C for 4 hours each to obtain...

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Abstract

The invention discloses a method for manufacturing a specially-shaped sprue cup by colloidal forming, which is designed for solving the technical problems that the quality and the like of the product are severely affected for the reason that the conventional sprue cup pressed and formed by a press is very high in cost, low in strength, severely worn due to being pressed by a steel mould for a long time and capable of introducing a plurality of impurities on the mould. The method adopting a gel-casting process comprises the following steps of: preparing a gel-casting monomer solution; adding a hard clay refractory material to the monomer solution for uniformly mixing to obtain a stable sizing agent; adding a catalyst and an initiator to the stable sizing agent; degassing under vacuum; pouring ceramic slurry to a mould; enabling the monomer and the cross-linking agent to completely react under the set temperature to obtain a ceramic biscuit; and drying and sintering the ceramic biscuit to obtain a precision-casting sprue cup product. The sprue cup manufactured by the method disclosed by the invention is high in strength, scouring resistant, good in thermo-plasticity under high temperature, less in bonded slag, and higher in quality than the sprue cup manufactured by the conventional method, and has the fire-resistant degree of 1670 DEG C to 1770 DEG C.

Description

technical field [0001] The invention relates to a method for preparing a special-shaped sprue cup, in particular to a method for preparing a special-shaped sprue cup by colloidal molding. It belongs to the technical field of refractory materials. Background technique [0002] Sprue cups for precision casting are the basic components serving casting technology, especially closely related to the development of the iron and steel industry. Sprue cup is one of the components of smelting process equipment. It is mainly used to guide the liquid metal into the channel of the cavity. The correct selection of the structure and size of the sprue cup and the reasonable placement on the casting can effectively suppress the defects of the casting such as pores, trachoma, iron beans, slag holes, shrinkage cavities, cracks and insufficient pouring. [0003] At present, there are many sprue cups in the domestic market, but most of them are low-quality products. The cost of sprue cups for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 赵辉韩绍娟许壮志薛健张明张全河
Owner LIAONING SILICATE RES INST
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