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Mold releasing coating for centrifugal casting and painting method of mold releasing coating

A technology of centrifugal casting and casting molds, which is applied to casting molding equipment, coatings, casting molds, etc., can solve problems such as welding defects, increased welding workload, and increased number of welds in main pipes, so as to reduce casting inclusions and discharge Good breathability, the effect of isolating invasion

Active Publication Date: 2015-12-09
SUZHOU NUCLEAR POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main pipeline of the PWR primary circuit can be forged or cast. When forged austenitic stainless steel is used, the structure of the main pipeline is uniform and the mechanical properties are good. However, due to the limitation of the manufacturing process, the number of welds in the main pipeline increases and the welding workload increases. Large, and due to the characteristics of the material itself, welding defects are prone to occur during welding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A release coating used in centrifugal casting for nuclear power main pipes is made by the following steps:

[0029] A preparation of base paint

[0030] Mix 5 kg of silica sol and 8 kg of rectorite, add water and stir for more than 1 hour, then pour 30 kg of graphite powder, 100 kg of bauxite of 270 mesh, 50 kg of talc powder of 100 / 200 mesh and grind with a ball mill. During the grinding process, add 4 kg of water glass, surface Active agent (OP-1) 1kg, n-butanol 1kg, boric acid 2kg, after grinding to ointment, continue rolling to make each component evenly dispersed, sealed storage after preparation.

[0031] Preparation of B surface coating

[0032] Pretreatment of raw materials, dissolving 8 kg of sodium bentonite in water for activation treatment, stirring well and then preparing 15% sodium bentonite slurry, standing for more than 48 hours for use; 0.5 kg of hydroxymethyl cellulose aqueous solution soaked in hot water Disperse (the water temperature is greater th...

Embodiment 2

[0040] A release coating used in centrifugal casting for nuclear power main pipes is made by the following steps:

[0041] A preparation of base paint

[0042] Mix 10kg of silica sol and 8kg of rectorite, add water and stir for more than 1 hour, then pour 30kg of graphite powder, 100kg of bauxite of 270 mesh, 50kg of talc powder of 100 / 200 mesh, and grind with a ball mill. During the grinding process, add 4kg of water glass, surface Active agent (OP-1) 1kg, n-butanol 1kg, boric acid 2kg, after grinding to ointment, continue rolling to make each component evenly dispersed, sealed storage after preparation.

[0043] Preparation of B surface coating

[0044] Pretreatment of raw materials, dissolving 8kg of sodium bentonite in water for activation treatment, stirring well to prepare 15% sodium bentonite slurry, standing for more than 48 hours; soaking 0.1kg of hydroxymethyl cellulose aqueous solution in hot water Disperse (the water temperature is greater than 50°C), stir well a...

Embodiment 3

[0052] A release coating used in centrifugal casting for nuclear power main pipes is made by the following steps:

[0053] A preparation of base paint

[0054] Mix 10kg of silica sol and 5kg of rectorite, add water and stir for more than 1 hour, then pour 20kg of graphite powder, 30kg of diatomaceous earth, 50kg of talc powder of 100 / 200 mesh and grind with a ball mill. During the grinding process, add 2kg of water glass, surfactant (OP-1) 0.5kg, n-butanol 0.5kg, boric acid 3kg, after grinding to ointment, continue rolling to make each component evenly dispersed, sealed storage after preparation.

[0055] Preparation of B surface coating

[0056] Pretreatment of raw materials, dissolving 5kg of sodium bentonite in water for activation treatment, stirring well and then preparing 15% sodium bentonite slurry, standing for more than 48 hours for use; soaking and dispersing 1kg of polyacrylamide in hot water (water temperature greater than 50°C), fully stirred evenly and prepared...

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Abstract

The invention relates to a mold releasing coating for a centrifugal casting and a painting method of the mold releasing coating, in particular to a mold releasing coating for a nuclear power station main pipe in the centrifugal casting and a painting method of the mold releasing coating. The mold releasing coating comprises a base coating and a surface coating, wherein the base coating is used for coating the surface of a cast mold, and the surface coating is used for coating the base coating layer on the surface of the cast mold. The base coating comprises a component A, a component B, a component C and a component D, wherein the component A is graphite powder, the component B is bauxite or kieselguhr, the component C is talcum powder, and the component D is silica solution or aluminum phosphate. The surface coating comprises a component E, a component F, a component G, a component H and a component I, wherein the component E is quartz powder or high-aluminum powder or zirconium oxide powder, the component F is zirconium silicate powder or zircon powder or emery powder or bauxite, the component G is silica powder or kieselguhr, the component H is boracic slag powder, and the component I is a hydroxymethyl cellulose water solution or polyacrylamide hydroxyl or sodium alginate.

Description

technical field [0001] The invention relates to a release coating for centrifugal casting castings and a brushing method thereof, in particular to a release coating for centrifugal casting of nuclear power plant main pipes and a brushing method thereof. Background technique [0002] As the concept of low-carbon environmental protection is becoming more and more popular, nuclear power, a clean energy source, has attracted more and more attention from all countries. Since the end of the last century, my country has carried out the localization of nuclear power equipment until now, and the cast stainless steel used for the reactor coolant main pipe of the second generation nuclear power plant has been completely localized. However, in the actual production process, especially in the process of centrifugal casting of straight pipes, problems such as cold shut, cracks, and difficulty in demoulding on the casting surface caused by the release coating often occur. Difficulties in ...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 刘钊梁书华阚玉琦张绍军赵东海吴洪杨文彬张文中
Owner SUZHOU NUCLEAR POWER RES INST
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