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A kind of ceramic core and its preparation method and application

A technology of ceramic cores and high-temperature-resistant ceramics, which is applied in the field of precision casting, can solve problems affecting precision, excessive corrosion of precision castings, and time-consuming and energy-consuming production processes, achieving high production efficiency, high yield, and improved mechanical properties and the effect of thermal shock properties

Active Publication Date: 2021-04-23
佛山市恒之芯复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, chemical methods or chemical and physical methods are usually used to remove such ceramic cores. However, the use of chemicals not only brings about certain environmental protection problems, but also easily causes excessive corrosion to precision castings during the demoulding process and affects the precision.
In addition, the traditional ceramic core preparation process requires long-term ball milling, degreasing and firing processes, and the production process is very time-consuming and energy-consuming

Method used

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  • A kind of ceramic core and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A ceramic core, which is composed of 30% high-temperature-resistant ceramic material, 10% water-based organic adhesive, 4% plasticizer, 2% mold release agent, 0.8% fiber and the balance of 400% by weight. Objective magnesium oxide composition.

[0017] Wherein the high temperature resistant ceramic material is composed of 10% 1000 mesh alumina and 20% 400 mesh silica according to the total weight percentage of raw materials; the water-based organic adhesive is a water-based epoxy resin adhesive; the fiber is made of plant fiber Mixed with chemical synthetic fibers.

[0018] Preparation:

[0019] Mix the above raw material components evenly, press the material into the mold in a pressure molding machine, the pressure is 5MPa, the mold temperature is 150°C, take it out after hot pressing, and complete the preparation process of the ceramic core. Wherein the molding time of the hot pressing molding is 100s.

Embodiment 2

[0021] A ceramic core, which is composed of 5% high temperature resistant ceramic material, 15% water-based organic adhesive, 18% plasticizer, 0.6% mold release agent, 3% fiber and balance of 400% by weight Objective magnesium oxide composition.

[0022] Wherein the high-temperature resistant ceramic material is composed of 3.5% of 100-mesh alumina and 1.5% of 2000-mesh silicon oxide according to the total weight percentage of raw materials; the water-based organic adhesive is a water-based acrylic resin adhesive; and the fibers are inorganic fibers.

[0023] Preparation:

[0024] Mix the above raw material components evenly, press the material into the mold in a pressure molding machine, the pressure is 20MPa, the mold temperature is 100°C, take it out after hot pressing, and complete the preparation process of the ceramic core. Wherein the molding time of the hot pressing molding is 60s.

Embodiment 3

[0026] A ceramic core, which is composed of 23% high-temperature-resistant ceramic material, 5% water-based organic adhesive, 12% plasticizer, 5% mold release agent, 0.02% fiber and the balance of 200% by weight. Objective magnesium oxide composition.

[0027] Wherein the high temperature resistant ceramic material is 300 mesh silicon carbide; the water-based organic adhesive is a water-based phenolic resin adhesive; the fiber is a metal fiber.

[0028] Preparation:

[0029] Mix the above raw material components evenly, press the material into the mold in a pressure molding machine, the pressure is 12MPa, the mold temperature is 120°C, take it out after hot pressing, and complete the preparation process of the ceramic core. Wherein the molding time of the hot pressing molding is 250s.

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Abstract

The invention discloses a ceramic core, which is composed of 1-30% of high temperature resistant ceramic material, 5-15% of water-based organic adhesive, 1-20% of plasticizer and 0.5-5% of dehydrator in weight percentage. Moulding agent, 0.01~3% fiber and balance magnesium oxide. The preparation method is to mix the raw material components evenly, press the material into the mold in a pressure molding machine, control the pressure within the range of 1-20 MPa, control the temperature of the mold within the range of 90-160 ℃, and take it out after hot-pressing molding. , to complete the ceramic core preparation process. Compared with the traditional core, the ceramic core prepared by the invention has low residual strength and high concession, and can be cleaned by physical cleaning, namely vibration shot blasting, without chemical cleaning, thereby satisfying the requirements of precision casting cores. High precision and good collapsibility are required. The preparation method of the ceramic core of the invention is simple and quick, does not require long ball milling, degreasing and firing processes, has high production efficiency, is energy-saving and environmentally friendly, and is easy to prepare cores with complex shapes.

Description

technical field [0001] The invention relates to the field of precision casting, in particular to a ceramic core and its preparation method and application. Background technique [0002] In precision casting, the complex inner cavity of the casting and the cavity that is difficult to make a shell are mainly formed by a prefabricated ceramic core, and the core is removed after the casting is cast. In the prior art, chemical methods or chemical and physical methods are usually used to remove such ceramic cores. However, the use of chemicals not only brings certain environmental protection problems, but also easily causes excessive corrosion to precision castings during the demolding process and affects the precision. . In addition, the traditional ceramic core preparation process requires long-term ball milling, degreasing and firing processes, and the production process is very time-consuming and energy-consuming. How to improve the release performance of ceramic cores and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/00
CPCB28B3/025C04B26/14C04B35/14C04B2235/3217C04B14/304C04B18/023C04B16/02C04B18/24C04B2103/0068C04B14/38C04B14/48
Inventor 张志锋
Owner 佛山市恒之芯复合材料有限公司