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Paint for main pipe centrifugal casting mould pipe in million kilowatt grade nuclear power plant and coating method thereof

A technology of centrifugal casting and coating method, which is applied in the direction of casting molding equipment, casting mold, casting mold composition, etc., which can solve the problems that cannot meet the technical requirements, and achieve the effect of preventing inclusions and slowing down the cooling rate

Active Publication Date: 2012-01-11
烟台台海玛努尔核电设备有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The existing barrel coating and coating process cannot meet the technical requirements of the above-mentioned centrifugal pouring of the main pipeline of the primary circuit in terms of raw material selection, proportioning and coating process control of the coating

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0018] The following are specific examples of coating preparation and coating methods of the present invention.

[0019] 1. The preparation process of the tube coating:

[0020] Step 1: Prepare zircon powder coating:

[0021] First, according to the ratio of 60kg water to 7 cubic decimeters of bentonite powder, mix water and bentonite powder to make bentonite slurry for zircon powder coating, and let it stand for 24-48 hours, and then mix 1 Raising the ratio of swelling slurry for zircon powder coating and mixing the swelling slurry for zircon powder coating with zircon powder evenly to prepare zircon powder coating for use.

[0022] The second step: prepare quartz powder coating: first, mix water, bentonite powder and water glass according to the ratio of 20kg water with 2.5 cubic decimeters of bentonite powder and 3.5 liters of water glass to make a swelling paste for quartz powder coating, and statically Place it for 24-48 hours, then mix the swelling slurry for quartz po...

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Abstract

The invention relates to a paint for main pipe centrifugal casting mould pipes in a million kilowatt grade nuclear power plant and a coating method thereof. Mould pipes are preheated to 225+ / -25DEG C before spraying and stay at constant temperature for 1-3 hours. The spraying pressure ranges from 0.5Mpa to 1.0Mpa, and the temperature of the mould pipes maintains from 200DEG C to 250DEG C during the spraying process; spraying is performed for 5-10 times, and the coating thickness needs to be 4+ / -0.3mm; the temperature of the mould pipes which are roasted after coating is greater than or equal to 280DEG C and the mould pipes are insulated for 1-2 hours. The paint layer, which is a high temperature resistant light material with specific thickness, can effectively protect the mould pipes and alleviate the cooling speed of molten steel as well, and can meet technical requirements of main pipe blank centrifugal casting in a million kilowatt grade nuclear power plant.

Description

technical field [0001] The invention relates to a coating for a centrifugal casting mold cylinder of a main pipeline of a nuclear power plant and a coating method thereof, in particular to a coating for a centrifugal casting mold cylinder of a main pipeline of a million-kilowatt nuclear power plant and a coating method thereof. Background technique [0002] The reactor cooling system (also known as the primary circuit) of the pressurized water reactor nuclear power plant is a nuclear first-level equipment system located in the nuclear island, which undertakes the function of transferring the heat generated by the reactor to the steam generator. Since the primary loop coolant directly enters and exits the nuclear reactor, it has radioactive pollution, so the requirements for its reliability are very high. The operating conditions of the primary circuit are harsh, and it must withstand 280-320 ° C, 150-160 atmospheric pressure and corrosive media (the reactor coolant contains ...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C23/02B22D13/10
Inventor 王根启李政军赵天明冯庆辉
Owner 烟台台海玛努尔核电设备有限公司
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