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Coating and raw material composition, investment casting mold shell and preparation method and application of investment casting mold shell

A raw material composition and coating technology, which is applied to casting molding equipment, coatings, casting molds, etc., can solve the problems of increased pores on the surface of castings, easy cracking of mold shells, and increased casting costs, so as to reduce the cost of mold shells, Low cost, the effect of improving high temperature strength

Active Publication Date: 2022-05-31
SHANGHAI ZHONGZHOU SPECIAL ALLOY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the problem that the existing investment casting technology medium shell is only suitable for small and medium-sized precision castings, and the shell of large precision castings is prone to shell explosion; the increase in the number of shell layers leads to a decrease in air permeability and an increase in pores on the surface of the casting , the defects of increased casting cost and prolonged production cycle, a coating and raw material composition, investment casting mold shell and its preparation method and application are provided

Method used

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  • Coating and raw material composition, investment casting mold shell and preparation method and application of investment casting mold shell
  • Coating and raw material composition, investment casting mold shell and preparation method and application of investment casting mold shell
  • Coating and raw material composition, investment casting mold shell and preparation method and application of investment casting mold shell

Examples

Experimental program
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Effect test

Embodiment 1

[0071] The liquid aluminum dihydrogen phosphate of embodiment 1 shown in table 2 is mixed with silica sol (density 1.18g / mL) to obtain a wet binder, and the solid aluminum dihydrogen phosphate is mixed with mullite and mullite powder to obtain a solid adhesive. The binder, the wet binder, the solid binder and the pottery clay are mixed, stepped on and beaten, and placed with a plastic wrap at 25° C. for 24 hours to ferment to obtain a coating. Among them, the weight ratio of aggregate, powder and plastic material is 1:2:3; the weight ratio of silica sol and solid particles is 1:2.54; the weight ratio of silica sol and aluminum dihydrogen phosphate is 1:0.3.

[0072] The paint is applied to the outer surface of the mold shell with a coating thickness of 5mm, baked at 200°C, and then fired at 1000-1100°C to obtain the investment casting mold shell.

[0073] The preparation method of the shell is as follows: apply the slurry of each layer shown in Table 3 in sequence, and the thi...

Embodiment 2

[0078] The raw materials are as shown in Example 2 of Table 2, and the others are the same as in Example 1 to obtain a coating and an investment casting mold shell. Among them, the weight ratio of aggregate, powder and plastic material is 1:2.5:3.5; the weight ratio of silica sol and solid particles is 1:2.54; the weight ratio of silica sol and aluminum dihydrogen phosphate is 1:0.5.

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Abstract

The invention discloses a coating, a raw material composition, an investment casting mold shell and a preparation method and application of the investment casting mold shell. The raw material composition of the coating comprises the following components in parts by weight: 100 parts of silica sol, 200-500 parts of solid particles and 20-70 parts of aluminum dihydrogen phosphate, wherein the solid particles comprise a silicon-aluminum refractory material and a plastic material, the silicon-aluminum refractory material comprises a powder material of 200-400 meshes and an aggregate of 10-60 meshes, and the weight ratio of the aggregate to the powder material to the plastic material is 1: (1.5-3): (2.5-4); the particle size of silicon dioxide in the silica sol is 20-40nm. The coating is used for reinforcing the shell of the large precision casting, so that the strength of the shell is greatly improved under the condition of conventional shell layers, the shell explosion rate is reduced, and the coating is particularly suitable for casting of the large precision casting.

Description

technical field [0001] The invention relates to a paint, a raw material composition, an investment casting mold shell, a preparation method and an application thereof. Background technique [0002] The investment casting process is to make a fusible model (referred to as investment mold) with fusible materials (such as wax, etc.), coat it with several layers of special refractory materials, and form an integral shell after drying and hardening. The meltable mold is melted in the mold shell, put into a roasting furnace for high-temperature roasting to obtain a mold shell, and then molten metal is poured into the mold shell to obtain a casting. This casting process can produce metal parts or exquisite handicrafts that are precise and complex, close to the final shape of the product, and can be used directly without or with little processing. It can be used to manufacture heat-resistant alloys with complex shapes such as blades, impellers, and nozzles of aircraft engines. Part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C9/04
CPCB22C3/00B22C9/04
Inventor 朱晓
Owner SHANGHAI ZHONGZHOU SPECIAL ALLOY MATERIALS
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