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A paint for thoroughly eliminating surface reaction layer defects of ductile iron parts

A technology of surface reaction and ductile iron parts, which is applied in the direction of coating, casting molding equipment, casting mold composition, etc., can solve the problem of failing to meet the stable quality requirements of the reaction layer of high-end safety ductile iron parts and the production of high-end safety ductile iron parts. Quality requirements, thickness reduction of flake graphite reaction layer and other issues, to achieve the effect of eliminating reaction layer defects, excellent thixotropy and rheology, and preventing surface defects of castings

Active Publication Date: 2021-03-30
纪汉成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] To this end, we use the most advanced anti-seepage sulfur anti-reaction layer casting coatings at home and abroad, such as FOSECO zircon powder shielding coatings, Ouquai OA or Guangzhou Kao magnesia powder absorption coatings, and other special shielding- The absorption-type coatings are all ineffective; in addition, the use of more expensive low-sulfur curing agents reduces the sulfur content and reduces the thickness of the flake graphite reaction layer, but fundamentally does not solve the reaction layer defects. Meet the production quality needs of high-end security ductile iron parts
[0005] The Chinese invention patent with application number 201510841691.2 is titled "A coating and method for improving flake graphite in the runner of austenitic ductile iron parts"; the Chinese invention patent with application number 201810523372.0 is titled "A method for reducing the Nodular Iron Shaped Graphite Thickness Technology", the invention mainly relies on the zircon powder coating to shield the sulfur-containing gas, making it difficult for the sulfur-containing gas to enter the molten metal through the coating layer, preventing the flake graphite reaction layer from appearing on the surface of the casting; application The invention patent No. 201610681533.X is titled "Anti-seepage coating on the surface of wind power ductile iron parts produced by furan resin sand". The thickness of flake graphite in the reaction layer, but the practical effect of the three shielding and absorbing coating patents can not meet the stable quality requirements of the reaction layer of ≤0.30mm for high-end security ductile iron parts, so it is necessary to study a method to completely eliminate Coating and method for surface reaction layer defects of ductile iron parts

Method used

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  • A paint for thoroughly eliminating surface reaction layer defects of ductile iron parts

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Embodiment 1

[0030] This embodiment provides a coating that completely eliminates the surface reaction layer defects of ductile iron parts. Its components and weight percentages of each component are as follows: 20% zircon powder, 30% spheroidized mixture, 2% lithium-based bentonite, thermosetting phenolic resin 2%, auxiliary agent 3%, the rest of ethanol; the nodulizing mixture is a mixture of a nodulizing agent and an inoculant, and the inoculant accounts for 50% of the weight ratio of the nodulizing agent; the particle size of the nodulizing agent and the inoculant is 50-100 mesh; the auxiliary agent is 0.5% of polyvinyl butyral, 2.5% of iron oxide red, and 0.5% of defoamer.

[0031] The particle size of the zircon powder is 250 mesh.

[0032] The particle size of the lithium-based bentonite is 350 mesh.

[0033] The particle size of the iron oxide red is 250 mesh.

[0034] The nodulizer is 2-6 rare earth magnesium ferrosilicon alloy, its composition (wt, %) is: Si43-47, Mg5.5-7.0, RE...

Embodiment 2

[0046] This embodiment provides a coating that completely eliminates the surface reaction layer defects of ductile iron parts. Its components and weight percentages of each component are as follows: 20% zircon powder, 35% spheroidized mixture, 2.5% lithium-based bentonite, thermosetting phenolic resin 2.5%, auxiliary agent 3%, the rest ethanol; the nodulizing mixture is the mixture of nodulizing agent and inoculant, and the weight ratio of inoculant accounting for nodulizing agent is 60%; the particle size of described nodulizing agent and inoculant is 50-100 mesh; the auxiliary agent is 0.5% of polyvinyl butyral, 2.5% of iron oxide red, and 0.5% of defoamer.

[0047] The particle size of the zircon powder is 250 mesh.

[0048] The particle size of the lithium-based bentonite is 350 mesh.

[0049] The particle size of the iron oxide red is 250 mesh.

[0050] The nodulizer is 2-6 rare earth magnesium ferrosilicon alloy, its composition (wt, %) is: Si43-47, Mg5.5-7.0, RE2.0-2....

Embodiment 3

[0062] This embodiment provides a coating that completely eliminates the surface reaction layer defects of ductile iron parts. Its components and weight percentages of each component are as follows: 25% of zirconium powder, 30% of spheroidized mixture, 2.5% of lithium-based bentonite, thermosetting phenolic resin 2.5%, auxiliary agent 3%, the rest ethanol; the nodulizing mixture is the mixture of nodulizing agent and inoculant, and the weight ratio of inoculant accounting for nodulizing agent is 40%; the particle size of described nodulizing agent and inoculant is 70-140 mesh; the auxiliary agent is 0.5% of polyvinyl butyral, 2.5% of iron oxide red, and 0.5% of defoamer.

[0063] The particle size of the zircon powder is 250 mesh.

[0064] The particle size of the lithium-based bentonite is 350 mesh.

[0065] The particle size of the iron oxide red is 250 mesh.

[0066] The nodulizer is 2-6 rare earth magnesium ferrosilicon alloy, its composition (wt, %) is: Si43-47, Mg5.5-7...

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Abstract

The invention discloses a coating capable of thoroughly eliminating defects of a reaction layer on the surface of a nodular iron casting. The coating comprises the following components in percentage by weight: 20-30% of zircon powder, 30-40% of spheroidized mixture, 2-3% of lithium bentonite, 2-3% of thermosetting phenolic resin, 2-4% of assistant and 25-30% of ethanol, wherein the spheroidized mixture is the mixture of a spheroidizing agent and an inoculant, and the inoculant accounts for 40-60% of the spheroidizing agent. The invention also provides a method for thoroughly eliminating the defects of the reaction layer on the surface of the nodular iron casting. The method comprises the following steps: coating the surface of a resin sand mold with paint in a flowing manner, brushing withpaint, drying the coating in a surface drying furnace, closing a box, and carrying out casting. The method can have neutralizing, absorbing and shielding effects on sulfur elements in the resin sandmold and sulfur-containing gas diffused into molten iron, has a good supplemented spheroidizing effect on the molten iron, prevents the surface of the nodular iron casting from having a sulfurizing defect, thoroughly eliminates the defects of the reaction layer on the surface of the nodular iron casting produced from furan resin sand, and improves the surface quality of the nodular iron casting.

Description

technical field [0001] The invention belongs to the technical field of casting coatings, and in particular relates to a coating and a method for thoroughly eliminating surface reaction layer defects of ductile iron pieces. Background technique [0002] After years of casting technology development, furan resin sand molding technology has been very mature and widely used in the foundry industry at home and abroad. The principle of the furan resin sand molding process is: add furan resin and curing agent to the molding sand and stir evenly, and the resin and curing agent react to harden the sand mold to meet the strength requirements of pouring molten iron. The curing agent must be an acid liquid. The most economical and best curing agent is a sulfonic acid curing agent, and the sulfonic acid contains sulfur. Sulfur brought in) to form S0 2 Enter the molten iron on the surface of the cavity, S0 2 React with magnesium (Mg) in molten iron: Mg+S0 2 =MgO+MgS, the result of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00B22D27/20
CPCB22C3/00B22D27/20
Inventor 纪汉成
Owner 纪汉成
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