A kind of high collapsible ceramic core and preparation method thereof

A ceramic core and collapsibility technology, applied in the field of materials, can solve the problems of no environmental protection core removal equipment, difficulty in core removal, etc., and achieve good sintering performance, good molding, and good collapsibility.

Active Publication Date: 2018-03-16
兴化市兴东铸钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alumina stem ceramic core has good high temperature performance and dimensional stability, but it is difficult to remove the core and needs to be equipped with high temperature and high pressure equipment. There is currently no environmentally friendly and efficient core removal equipment in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0050] A kind of preparation method of above-mentioned ceramic core, the step comprises:

[0051] 1) Mix and stir the quartz glass powder, mineralizer and binder according to the formula ratio; the state of the mixture can be sand;

[0052] 2) Dry the mixed material;

[0053] 3) Carry out ball milling after finishing;

[0054] 4) Prepare the ball-milled powder and the plasticizer in proportion to make a slurry;

[0055] 5) Press the slurry to form the core blank, the pressing pressure is 5-10 MPa; then send it into the roasting furnace for roasting, the roasting temperature is 500°C-800°C, and the roasting time is 240-360 minutes.

[0056] In the step 2), the material is dried in a vacuum environment, the ambient pressure is not greater than 0.08MPa, the ambient temperature is controlled at 30°C, and the temperature is kept for 120 minutes; in the step 3), the ball milling time is required to be 120-180 minutes.

example 1

[0058] a. In the quartz glass powder, the proportion of different particle size classifications is: 400 mesh accounts for 65%, 300 mesh accounts for 20%, 200 mesh accounts for 5%, and 150 mesh is the balance;

[0059] B, the consumption of described mineralizing agent is: the consumption of the corresponding mineralizing agent of every 1kg quartz glass powder is 5g;

[0060]c, the consumption of described binding agent is: the consumption of binding agent corresponding to every 1kg quartz glass powder is 100ml;

[0061] d. The dosage of the plasticizer is: 120 g of plasticizer per 1 kg of quartz glass powder; the mass percentage of polyethylene in the plasticizer is 16%.

[0062] In the step 5): the pressing pressure requirement is 6 MPa; the roasting temperature is 500°C for 60 minutes, the temperature is raised to 600°C for 30 minutes, the temperature is raised to 700°C for 30 minutes, and the temperature is raised to 800°C for 180 minutes;

example 2

[0064] a. In the quartz glass powder, the proportion of different particle size classifications is: 400 mesh accounts for 62%, 300 mesh accounts for 17%, 200 mesh accounts for 7%, and 150 mesh is the balance;

[0065] B, the consumption of described mineralizing agent is: the consumption of the corresponding mineralizing agent of every 1kg quartz glass powder is 8g;

[0066] c, the consumption of described binding agent is: the consumption of the binding agent corresponding to every 1kg quartz glass powder is 90ml;

[0067] d. The dosage of the plasticizer is: 140 g of plasticizer per 1 kg of quartz glass powder; the mass percentage of polyethylene in the plasticizer is 18%.

[0068] In the step 5): the pressing pressure requirement is 10 MPa; the roasting temperature is 500°C for 60 minutes, and the temperature is raised to 700°C for 300 minutes;

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Abstract

The invention discloses a high-collapsibility ceramic mould core which comprises quartz glass, a mineralizer, a binder and a plasticizer, wherein a, the quartz glass is powder which is a stem material; the grain size of the quartz glass powder is 150-400 meshes, and the powder is a mixture of the quartz glass powder with different grain sizes; b, the mineralizer is boric acid; c, the binder is silica sol or ethyl silicate; and d, the plasticizer is a mixture of paraffin and polyethylene. A preparation method for the ceramic mould core comprises the following steps: 1) mixing and stirring the quartz glass powder, the mineralizer and the binder according to the proportion of the formula until the state of the mixture is sand cluster; 2) drying the mixed materials; 3) ball-milling the mixed materials after drying the mixed materials; 4) preparing ball-milled powder and the plasticizer in proportion to prepare slurry; and 5) pressing the slurry into mould core blank; and feeding the mould core blank into a roasting furnace to carry out roasting. The ceramic mould core mixed blank is good in molding and is high in strength, and has good sintering characteristics; and after being poured, the mould core has good collapsibility.

Description

technical field [0001] The technical proposal belongs to the field of material technology, in particular to a highly collapsible ceramic core used in the field of investment casting and a preparation method thereof. Background technique [0002] The ceramic core is an adapter for manufacturing investment casting hollow castings. Its function is to form the inner cavity shape of the hollow casting and ensure the original dimensional accuracy of the casting wall together with the shell. As investment casting moves towards "precision, thin wall With the development in the direction of "no margin", the performance and engineering manufacturability of ceramic cores are facing severe challenges. At present, ceramic cores widely used in investment casting mainly include silica stem and alumina stem ceramic cores. The alumina stem ceramic core has good high temperature performance and dimensional stability, but it is difficult to remove the core and needs to be equipped with high t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/00B22C1/18B22C1/20B22C9/10
CPCB22C1/00B22C1/186B22C1/205B22C9/10
Inventor 孙革唐荣俊唐荣彪
Owner 兴化市兴东铸钢有限公司
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