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High-temperature resistant precoated sand

A technology of coated sand and high temperature resistance, applied in the field of coated sand, can solve the problems of insufficient tensile strength, unfavorable wide application, poor fire resistance durability, etc., and achieves the effects of low manufacturing cost, easy operation, and improved tensile strength.

Active Publication Date: 2016-09-21
临沂茂源新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, its fire-resistant durability is still relatively poor, and its tensile strength is not enough, lower than 5MPa, and its gas generation is large, which is not conducive to its wide application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A high temperature resistant coated sand, the coated sand comprises by weight:

[0033]

[0034]

[0035] Wherein, in the mixture of zirconium quartz powder and refractory fiber, the weight ratio of zirconium quartz powder and refractory fiber is 3:5, the original sand is silica sand, the curing agent is hexamethylenetetramine, and the even The coupling agent is a silane coupling agent, and the lubricant is calcium stearate.

[0036] After testing, the coated sand of this embodiment has very good high temperature resistance, especially when casting castings with complex structures, it is not easy to break, and the rupture rate is only 0.8%; the tensile strength of the coated sand of this embodiment is between 9MPa, the gas output is 13.

Embodiment 2

[0038] A high temperature resistant coated sand, the coated sand comprises by weight:

[0039]

[0040] Wherein, in the mixture of zirconium quartz powder and refractory fiber, the ratio of parts by weight of zirconium quartz powder and refractory fiber is 3:5, the raw sand is magnesia, the curing agent is hexamethylenetetramine, the The coupling agent is a silane coupling agent, and the lubricant is calcium stearate.

[0041] After testing, the coated sand of this embodiment has very good high temperature resistance, especially when casting castings with complex structures, it is not easy to break, and the rupture rate is only 1%; the tensile strength of the coated sand of this embodiment is between 10MPa, the gas output is 14.

Embodiment 3

[0043] A kind of high temperature resistant coated sand, the coated sand comprises by mass parts:

[0044]

[0045] Wherein, in the mixture of zirconium quartz powder and refractory fiber, the ratio of parts by weight of zirconium quartz powder and refractory fiber is 3:8, the raw sand is corundum sand, and the curing agent is hexamethylenetetramine. The coupling agent is a silane coupling agent, and the lubricant is calcium stearate.

[0046] After testing, the coated sand of this embodiment has very good high temperature resistance, especially when casting castings with complex structures, it is not easy to break, and the rupture rate is only 0.6%; the tensile strength of the coated sand of this embodiment is between 12MPa, the gas output is 11.

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Abstract

The invention belongs to the technical field of casting, and in particular, relates to high-temperature resistant precoated sand. The high-temperature resistant precoated sand comprises the following components in parts by weight: 100 parts of crude sand, 12-15 parts of adhesive, 2-5 parts of curing agent, 8-10 parts of coupling, 1-3 parts of lubricating agent, 5-10 parts of zirconium quartz powder and refractory fiber mixture, and 0.2-0.35 part of tantalum oxide. As the zirconium quartz powder and refractory fiber mixture is added in the precoated sand, and tantalum oxide serves as an additive, the total refractory durability and the self structure stability of the precoated sand are collaboratively improved, the tensile strength of the precoated sand is greatly improved above 8 MPa, the gas generating quantity is lower than 15, and the application prospect is broad.

Description

technical field [0001] The invention belongs to the technical field of coated sand, and in particular relates to a high temperature resistant coated sand. Background technique [0002] Coated sand refers to a layer of solid resin film on the surface of the sand before molding, which is used to make casting sand or core sand for cast steel or cast iron molds. There are two processes for making coated sand, the cold method and the hot method. The cold method dissolves the resin with ethanol, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand, and the ethanol volatilizes to obtain a coated sand. Sand: Preheat the sand to a certain temperature by thermal method, add resin to make it melt, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtain coated sand. [0003] Because coated sand has the advantages of high strength, low gas generation, high dime...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/02
CPCB22C1/00B22C1/02
Inventor 徐德生
Owner 临沂茂源新材料科技有限公司
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