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Investment casting surface coating preparation method

A technology for surface coatings and manufacturing methods, applied in the field of materials, can solve problems affecting the stability of coatings, etc.

Inactive Publication Date: 2015-03-04
NINGBO JINQIU MECHANICAL & ELECTRICAL CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual use, it will be found that some impurity ions will still enter the coating, which will affect the stability of the coating. The main reason is that some impurities will still be exposed during the final grinding process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A manufacturing method of investment casting surface layer refractory coating:

[0037] Heat the quartz powder to 1050°C in the heating furnace and keep it constant for 10-15 minutes;

[0038] Pass the 0.5MPa supersaturated steam mixed with 10ppm sulfuric acid into the heating furnace for 15 minutes, then take the powder out of the furnace and quickly cool down to normal temperature and wash with water;

[0039] Dry the powder by spray drying and grind it into 50-300 micron particles;

[0040] Mix 50-300 micron quartz with 30% by weight of alumina at a weight percentage of 1:1; mix aluminum sol with a pH value of 3.5-4.5 and stir thoroughly; then spray drying, granulation, and grinding to obtain investment molds Mold shell materials for casting;

[0041] The selected density is 1.32-1.34g / cm 3 Water glass is binder, aluminum dihydrogen phosphate, refractory powder and appropriate solvent;

[0042] The weight ratio of the refractory powder to the binder is 1.25-1.35:1; the weight ...

Embodiment 2

[0046] A manufacturing method of investment casting surface layer refractory coating:

[0047] Heat the quartz powder to 1150°C in the heating furnace and keep it constant for 15-20 minutes;

[0048] After passing the 0.8MPa supersaturated steam mixed with 15ppm sulfuric acid into the heating furnace for 12 minutes, the powder material is discharged from the furnace and the temperature is quickly cooled to normal temperature and washed with water;

[0049] Dry the powder by spray drying and grind it into 50-300 micron particles;

[0050] Mix 50-300 micron quartz with a weight percentage of 1.2:1 and 25% alumina with a weight content of 25%; the aluminum sol with a pH value of 3.5 is mixed and fully stirred; and after spray drying, granulation, grinding is used for investment casting Shell material

[0051] The selected density is 1.32-1.34g / cm 3 Water glass is binder, aluminum dihydrogen phosphate, refractory powder and appropriate solvent;

[0052] The weight ratio of the refractory po...

Embodiment 3

[0056] A manufacturing method of investment casting surface layer refractory coating:

[0057] Heat the quartz powder to 1100°C in the heating furnace and keep it constant for 20-30 minutes;

[0058] Pass the 1.0MPa supersaturated steam mixed with 12ppm sulfuric acid into the heating furnace for 12 minutes, then take the powder out of the furnace and quickly cool down to normal temperature and wash with water;

[0059] Dry the powder by spray drying and grind it into 50-300 micron particles;

[0060] Mix 50-300 micron quartz with a weight percentage of 1.1:1 and 20% alumina with a weight content of 20%; the aluminum sol with a pH value of 4.5 is mixed and fully stirred; and then spray-dried, granulated, and milled to obtain investment casting Shell material

[0061] The selected density is 1.32-1.34g / cm 3 Water glass is binder, aluminum dihydrogen phosphate, refractory powder and appropriate solvent;

[0062] The weight ratio of the refractory powder to the binder is 1.25-1.35:1; the we...

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PUM

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Abstract

The invention relates to an investment casting surface coating preparation method thereof. According to the invention, powder of quartz, bauxite or a silicate refractory material is heated in a heating furnace; supersaturated water vapor mixed with sulfuric acid is delivered into the heating furnace; the powder material is discharged from the furnace and is rapidly cooled to normal temperature; the powder material is washed by using water, and is dried with a spray-drying manner; dried material is grinded into granules; the granules are mixed with aluminum sol with a weight percentage ratio of 1-1.2:1, and the mixture is sufficiently stirred; drying and granulation are carried out, and the mixture is grinded into refractory material powder; a binding agent water glass, aluminum dihydrogen phosphate, the refractory material powder and a proper amount of a solvent are selected; aluminum dihydrogen phosphate is dissolved in the solvent, such that a solution I is obtained; the solution I is added into the binding agent, and sufficient stirring is carried out; during the stirring process, the refractory material powder is added, and the mixture is well mixed through stirring; and the mixture is stood, such that the investment casting surface coating is obtained.

Description

Technical field [0001] The invention belongs to the field of materials, and belongs to the field of mold shell materials for investment casting, in particular to a method for manufacturing a surface coating for investment casting. Background technique [0002] The mold shell coating for investment casting is a refractory material. In investment casting, the mold shell must have high temperature resistance, thermochemical stability, and suitable thermal expansion properties. The gas permeability and shelling performance must meet the performance requirements of the casting. And these requirements for the mold shell need to be achieved by the refractory coating for the mold shell. [0003] There are many refractory coating materials that can be used to make the mold shell, and at the same time, different surface layers of the mold shell may contain different materials. The coatings currently used in the manufacture of mold shells can be divided into three categories, namely, refract...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00C04B35/66
Inventor 李良波
Owner NINGBO JINQIU MECHANICAL & ELECTRICAL CASTING