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sicp/eps lost foam and sicp/al casting process

A casting forming and lost foam technology, applied in casting forming equipment, casting mold components, manufacturing tools, etc., can solve the problem that the thickness of the wear-resistant layer cannot be made too thick, the size of the parts cannot be accurately controlled, and can only reach 3-5mm, etc. To achieve the effect of improving mechanical properties, improving performance and reducing decomposition phenomenon

Active Publication Date: 2020-09-15
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when coating the pattern, the size of the parts cannot be precisely controlled due to the difficulty of accurately controlling the thickness of the coating. Therefore, it brings great difficulties to mass production. The thickness of the grinding layer is usually only 3-5mm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] A SiCp / EPS lost foam process is carried out according to the following process steps:

[0077] Step 1: Mixing preparation: Weigh 10 parts of SiC particles, 2 parts of rare earth powder, 87 parts of EPS beads, and 1 part of binder by volume. First, the binder is formulated into a solution and sprayed on the surface of the EPS beads, and then mixed with SiC particles and rare earth powder in a mechanical stirrer. Among them, the particle size of SiC particles is 800 mesh. The rare earth powder is mixed rare earth RE.

[0078] Step 2: After preheating the mold to working temperature, proceed to the next step; specifically, set the mold preheating temperature to 100°C.

[0079] Step 3: Use compressed air to fill the mixed material into the mold, and pass in hot steam at a temperature of 100°C, with a hot steam pressure of 0.15MPa, and keep the pressure for 30s.

[0080] Step 4: After the pressure holding is over, release the hot steam; spray water on the back of the mold to cool ...

Embodiment 2

[0088] A SiCp / EPS lost foam process is carried out according to the following process steps:

[0089] Step 1: Mixing preparation: Weigh 12 parts of SiC particles, 2 parts of rare earth powder, 85 parts of EPS beads, and 1 part of binder by volume. First, the binder is formulated into a solution and sprayed on the surface of the EPS beads, and then mixed with SiC particles and rare earth powder in a mechanical stirrer. Among them, the particle size of SiC particles is 1600 mesh. The rare earth powder is mixed rare earth RE.

[0090] Step 2: After preheating the mold to working temperature, proceed to the next step; specifically, set the mold preheating temperature to 95°C.

[0091] Step 3: Use compressed air to fill the mixed material into the mold, and pass in hot steam at a temperature of 128°C, with a hot steam pressure of 0.19MPa, and keep the pressure for 8 minutes.

[0092] Step 4: After the pressure holding is over, release the hot steam; spray water on the back of the mold to...

Embodiment 3

[0100] A SiCp / EPS lost foam process is carried out according to the following process steps:

[0101] Step 1: Mixing preparation: Weigh 15 parts of SiC particles, 2 parts of rare earth powder, 81 parts of EPS beads, and 2 parts of binder by volume. First, the binder is formulated into a solution and sprayed on the surface of the EPS beads, and then mixed with SiC particles and rare earth powder in a mechanical stirrer. Among them, the particle size of SiC particles is 2500 mesh. The rare earth powder is mixed rare earth RE.

[0102] Step 2: After preheating the mold to the working temperature, proceed to the next step; specifically, set the mold preheating temperature to 105°C.

[0103] Step 3: Use compressed air to fill the mixed material into the mold, and pass in hot steam at a temperature of 120°C, with a hot steam pressure of 0.25 MPa, and maintain the pressure for 5 minutes.

[0104] Step 4: After the pressure holding is over, release the hot steam; spray water on the back of ...

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Abstract

The invention relates to a SiCp / EPS lost foam and a SiCp / Al casting forming technology and belongs to the technical field of casting. A preparation technology of the SiCp / EPS lost foam comprises the steps that 1 material mixing for preparation is conducted, wherein SiC particles, rare earth powder, EPS beads and adhesive are weighed and fetched according to volume parts, and the fetched SiC particles, rare earth powder, EPS beads and adhesive are evenly mixed; 2, after a mold is preheated to a work temperature, a next operation is performed; 3, the mixed materials are fed into the mold by means of compressed air, hot steam is fed, and pressure is kept; 4, hot steam is removed after pressure keeping is ended, water is sprayed to the back face of the mold for cooling so as to enable the moldto be cooled and enable the material temperature to be lowered to below a softening temperature, mold stripping is conducted after shaping, and then a SiCp / EPS lost foam pattern is obtained. The SiCp / Al lost foam casting forming technology adopts the prepared SiCp / EPS lost foam. The production efficiency is high, and the mechanical properties of a part can be improved.

Description

Technical field [0001] The invention relates to a SiCp / EPS lost foam and SiCp / Al casting forming process, belonging to the technical field of casting. Background technique [0002] SiC has excellent physical and chemical properties, and the market for SiC particles as an abrasive is very mature, which makes SiC powders have more varieties and lower prices. Therefore, the cheap SiC particles provided by the abrasive industry are added to the aluminum melt (casting method), and the prepared SiC particle-reinforced aluminum-based composite material has the advantages of low cost and suitable for industrial production. Therefore, since the 1980s, some foreign research departments have invested a lot of manpower and material resources in the research of SiCp / Al composite materials. Up to now, SiC particle reinforced aluminum matrix composites, as a typical representative of metal matrix composites, are currently one of the most widely used advanced composite materials and have been w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C7/02B22C9/04B22D27/20B22D18/04
CPCB22C7/02B22C9/046B22D18/04B22D27/20
Inventor 谭建波
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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