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Silica sol modified coating for precision casting

A technology of silica sol and coating, which is applied to casting molding equipment, coatings, casting molds, etc., can solve the problem of high manufacturing cost of castings, and achieve the effect of low manufacturing cost and simple formula

Inactive Publication Date: 2020-08-25
无锡卡仕精密科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These problems ultimately lead to high manufacturing costs of castings

Method used

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  • Silica sol modified coating for precision casting
  • Silica sol modified coating for precision casting
  • Silica sol modified coating for precision casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The coating formula and coating thickness of the shell making process are shown in Table 1.

[0029] Table 1

[0030]

[0031] The formulation of the coating in the shell making process:

[0032] The preparation method of the surface coating is: according to the mass percentage, add 19.8% silica sol, 5% cobalt aluminate, 75% zirconium powder, 0.1% PVA, 0.1% magnesium aluminum silicate into the mixing tank, and start the mixing tank at the same time Stir the bar, rotate and stir at 30r / min, and stir for 12h to get the surface coating.

[0033] The preparation method of the back layer coating is as follows: according to the mass percentage, add 15% silica sol, 84.8% fused silica powder, 0.1% PVA, 0.1% magnesium aluminum silicate into the mixing tank, start the stirring bar at the same time, 30r / Min rotation and stirring, stirring for 12h, that is, the back coating.

Embodiment 2

[0035] See Table 2 for details of coating formula and coating thickness for shell making process.

[0036] Table 2

[0037]

[0038]

[0039] The formulation of the coating in the shell making process:

[0040] The preparation method of the surface coating is: according to the mass percentage, add 15% silica sol, 6% cobalt aluminate, 78.9% zirconium powder, 0.05% PVA, 0.05% magnesium aluminum silicate into the mixing tank, and start the mixing tank at the same time Stir the bar, rotate and stir at 20r / min, stir for 36h, and then get the surface coating.

[0041] The preparation method of the back layer coating is as follows: according to the mass percentage, add 18% silica sol, 81.9% fused silica powder, 0.05% PVA, 0.05% magnesium aluminum silicate into the mixing tank, start the stirring bar while adding the mixing tank, 20r / Min rotation and stirring, stirring for 36h, that is, the back coating.

Embodiment 3

[0043] See Table 3 for details of coating formula and coating thickness for shell making process.

[0044] table 3

[0045]

[0046] The formulation of the coating in the shell making process:

[0047] The preparation method of the surface coating is: according to the mass percentage, add 18% silica sol, 4.96% cobalt aluminate, 77% zirconium powder, 0.02% PVA, 0.02% magnesium aluminum silicate into the mixing tank, and start the mixing tank at the same time Stir the bar, rotate and stir at 25r / min, stir for 20h, and then get the surface coating.

[0048] The preparation method of the back layer coating is as follows: according to the mass percentage, add 19.6% silica sol, 80% fused silica powder, 0.02% PVA, 0.02% magnesium aluminum silicate into the mixing tank, start the stirring bar while adding the mixing tank, 25r / Min rotation and stirring, stirring for 20h, that is, the back coating.

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PUM

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Abstract

The invention discloses a silica sol modified coating for precision casting, which belongs to the technical field of precision casting. According to the invention, the silica sol coating for precisioncasting is modified; and when the modified casting is used for making a shell, and the mold shell is knocked open after dewaxing and roasting to observe the internal surface quality, the inner surface of the mold shell is dense and without holes. In the invention, the casting finishing and polishing efficiency reaches 160 pieces per shift, the casting qualification rate is over 85%, the formula is simple, and the manufacturing cost is low. The silica sol modified coating formula can be comprehensively promoted in the field of precision casting technology shell making.

Description

technical field [0001] The invention relates to a silica sol modified coating for precision casting, which belongs to the technical field of precision casting. Background technique [0002] In silica sol precision casting, the quality of shell making determines the surface quality of castings, and 60-70% of the poor surface of castings is due to shell making problems. The poor surface of castings will cause a large number of welding repairs, grinding repairs and even scrapping of general casting products. However, castings with high requirements are not allowed to be welded and repaired, and the scrap rate is higher. The surface of medical implants has a high proportion of burrs and sand holes. However, the surface quality of medical implant castings is high, and welding repair is not allowed. The surface burrs of castings need to be polished, and the efficiency may be as low as 50 pieces per shift; all castings with sand hole defects are scrapped, and the scrapping rate i...

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 鲁茂波李彦华张力邓元鑫高子程
Owner 无锡卡仕精密科技有限公司
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