A kind of boron nitride coating for pressure casting and preparation method thereof

A boron nitride and hexagonal boron nitride technology, which is applied in casting and molding equipment, coatings, molds, etc., can solve the problems of low molding rate and short service life, and achieves reduction of spraying times, production costs, and long service life. effect of life

Active Publication Date: 2020-09-18
SHANGQIU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in die casting, it is found that neither the boron nitride coating purchased on the market nor the laboratory-made boron nitride coating can fully meet the technical requirements of the die casting field, such as short service life, low molding rate and other fatal defects.

Method used

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  • A kind of boron nitride coating for pressure casting and preparation method thereof

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Effect test

Embodiment 1

[0023] The boron nitride coating for die casting in this embodiment is made of the following raw materials in weight ratio: 20% hexagonal boron nitride, 10% aluminum sol, 2% silicon carbide whiskers, 0.5% sodium tripolyphosphate, attapulgite 5%, isooctyl alcohol 0.2%, and the balance is demineralized water.

[0024] The preparation method of the boron nitride coating for pressure casting of the present embodiment is as follows:

[0025] (1) Mix and stir sodium tripolyphosphate, aluminum sol, attapulgite and demineralized water according to the weight ratio to form a uniform solution;

[0026] (2) Put the hexagonal boron nitride powder and reinforcing material into the ball mill with a ball-to-material ratio of 10:1, and take it out after ball milling for 30 minutes;

[0027] (3) Gradually add the hexagonal boron nitride powder and reinforcing material taken out in (2) into the solution prepared in (1), stir evenly, add isooctyl alcohol, and continue stirring until no bubbles ...

Embodiment 2

[0029] The boron nitride coating for die casting in this embodiment is made of the following raw materials in weight ratio: 40% hexagonal boron nitride, 20% aluminum sol, 5% boron nitride whiskers, 1% sodium tripolyphosphate, concave-convex stick 3%, isooctyl alcohol 0.5%, and the balance is demineralized water.

[0030] The preparation method of the boron nitride coating for pressure casting of the present embodiment is as follows:

[0031] (1) Mix and stir sodium tripolyphosphate, aluminum sol, attapulgite and demineralized water according to the weight ratio to form a uniform solution;

[0032] (2) Put a certain amount of hexagonal boron nitride powder and reinforcing material into the ball mill with a ball-to-material ratio of 10:1, and take it out after ball milling for 60 minutes;

[0033] (3) Gradually add the hexagonal boron nitride powder and reinforcing material taken out in (2) into the solution prepared in (1), stir evenly, add isooctyl alcohol, and continue stirr...

Embodiment 3

[0035] The boron nitride coating for die casting in this embodiment is made of the following raw materials in weight ratio: 50% hexagonal boron nitride, 30% aluminum sol, 10% composite of silicon carbide and silicon nitride, 2% sodium tripolyphosphate , Attapulgite 1%, isooctyl alcohol 0.6%, and the balance is demineralized water.

[0036] The preparation method of the boron nitride coating for pressure casting of the present embodiment is as follows:

[0037] (1) Mix and stir sodium tripolyphosphate, aluminum sol, attapulgite and demineralized water according to the weight ratio to form a uniform solution;

[0038] (2) Put a certain amount of hexagonal boron nitride powder and reinforcing material into the ball mill with a ball-to-material ratio of 10:1, and take it out after ball milling for 120 minutes;

[0039] (3) Gradually add the hexagonal boron nitride powder and reinforcing material taken out in (2) into the solution prepared in (1), stir evenly, add isooctyl alcohol...

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Abstract

The invention discloses a boron nitride coating for pressure casting and a preparation method thereof. The boron nitride coating is prepared through the following raw materials including, by weight, 20%-50% of hexagonal boron nitride, 10%-30% of aluminum sol, 2%-10% of a reinforcing material, 0.5%-2% of sodium tripolyphosphate, 1%-5% of attapulgite, 0.2%-0.6% of isooctanol and the balance softenedwater. The preparation method comprises the following steps that the sodium tripolyphosphate, the aluminum sol, the attapulgite and the softened water are mixed and stirred into a uniform solution, hexagonal boron nitride powder and the reinforcing material are loaded into a ball mill, are taken out after ball milling by a certain time and are gradually added into the even solution, and isooctylalcohol is added after forced stirring by a certain time until no bubbles are generated. The coating adopts an aqueous system, no harmful substances are volatilized in the using process, and cleanliness and environmental protection are achieved. In addition, silicon carbide and silicon nitride crystal whiskers serve as the reinforcing material, the hardness of the coating is improved, the technical requirements in the field of pressure casting are met, the molding rate of castings is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of metal and alloy casting, in particular to a boron nitride coating for pressure casting. Background technique [0002] Due to the wetting effect between the molten metal (aluminum, copper, magnesium, zinc, etc.) and the mold, the solidified residual metal liquid will be firmly bonded to the casting mold after casting, which often causes The shedding and damage of the surface layer of the mold reduces the service life of the mold, increases the labor intensity of the workers, and increases the production time. On the other hand, the small particles of the shed mold enter the metal melt, which reduces the product quality of the casting. [0003] Punch lubricant, etc. The current release agent for metal thermoforming generally uses water-based graphite or oil-based graphite, which is seriously polluted by dust or oil vapor evaporation during the production process, and the working conditions are poor, causi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00C09D1/00C09D7/61
Inventor 孙家书张向飞蒲三旭张弛翟滨
Owner SHANGQIU NORMAL UNIVERSITY
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