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A kind of preparation method of fused silica ceramic shell

A fused silica and ceramic type technology, applied in casting molding equipment, cores, molds, etc., can solve the problems of heat dissipation, cooling, easy formation of thermal joints, difficult molding technology, etc. Difficulty, fast heat dissipation, and the effect of reducing wall thickness

Active Publication Date: 2019-05-17
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above technical measures to enhance the structural strength of the ceramic shell are likely to cause adhesion between adjacent parts in the ceramic shell, which is especially obvious in the precision casting of multiple castings, such as multiple The investment casting molding of the guide vane, see figure 1 shown
[0004] The adhesion phenomenon between the adjacent parts of the ceramic shell used for investment precision casting is extremely unfavorable for the heat dissipation and cooling of the adhesion parts during pouring, so that it is easy to form a hot joint problem, which makes the poured castings prone to shrinkage defects, and then As a result, the molding technology is difficult, the scrap rate is high, and the molding cost is high, which is very impractical

Method used

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  • A kind of preparation method of fused silica ceramic shell

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Effect test

Embodiment 1

[0037] The present invention comprises the following steps:

[0038] Step 1. According to the design requirements, the shell is made of fused silica material on the wax pattern. The fused silica shell made on the wax pattern has five layers, until the last layer is completed, that is, the fifth layer of shell; the paraffin water emulsion is used for sealant;

[0039] Specifically, the preparation and sealing process of the five-layer fused silica shell on the wax model is achieved according to the following detailed steps:

[0040] Step ①. Mix 300 mesh white corundum powder and silica sol (SiO 2 content of 30%) according to the mass ratio of 3.3:1 formula mix evenly to prepare 1# slurry;

[0041] 180 mesh fused silica powder and silica sol (SiO 2 content of 30%) according to the mass ratio of 2.3:1 formula mix evenly to prepare 2# slurry;

[0042] Step ②. Dip the wax model into 1# slurry, and evenly coat a layer of 1# slurry on the surface of the wax model;

[0043] When ...

Embodiment 2

[0063] The present invention comprises the following steps:

[0064] Step 1. According to the design requirements, the shell is made of fused silica material on the wax pattern. The fused silica shell made on the wax pattern has five layers, until the last layer is completed, that is, the fifth layer of shell; the paraffin water emulsion is used for sealant;

[0065] Specifically, the preparation and sealing process of the five-layer fused silica shell on the wax model is achieved according to the following detailed steps:

[0066] Step ①. Mix 280 mesh white corundum powder and silica sol (SiO 2 The content is 25%) according to the mass ratio of 3.6: 1 and mixed evenly to prepare 1# slurry;

[0067] 200 mesh fused silica powder and silica sol (SiO 2 The content is 25%) according to the mass ratio of 2.6:1 and mix evenly to prepare 2# slurry;

[0068] Step ②. Dip the wax model into 1# slurry, and evenly coat a layer of 1# slurry on the surface of the wax model;

[0069] Wh...

Embodiment 3

[0089] The present invention comprises the following steps:

[0090] Step 1. According to the design requirements, the shell is made of fused silica material on the wax pattern. The fused silica shell made on the wax pattern has five layers, until the last layer is completed, that is, the fifth layer of shell; the paraffin water emulsion is used for sealant;

[0091] Specifically, the preparation and sealing process of the five-layer fused silica shell on the wax model is achieved according to the following detailed steps:

[0092] Step ①. Mix 320 mesh white corundum powder and silica sol (SiO 2 content of 30%) according to the mass ratio of 3.5:1 formula mix evenly to prepare 1# slurry;

[0093] 200 mesh fused silica powder and silica sol (SiO 2 The content is 25%) according to the mass ratio of 2.5: 1 and mixed evenly to prepare 2# slurry;

[0094] Step ②. Dip the wax model into 1# slurry, and evenly coat a layer of 1# slurry on the surface of the wax model;

[0095] Wh...

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Abstract

The invention discloses a method for preparing a fused quartz ceramic mold shell, which comprises the following steps: Step 1. Making a shell with fused quartz material on a wax mold until the last layer of shell making is completed; using paraffin water emulsion to seal the slurry; step 2. Put the prepared fused silica ceramic shell into a dewaxing kettle for dewaxing; put the dewaxed fused quartz ceramic shell into a furnace and roast, and burn off the residual wax; step 3. Put the roasted fused silica Put the ceramic shell into the coarse dispersion system of cristobalite fine powder, and perform soaking treatment; step 4. Take out the soaked fused silica ceramic shell from the coarse dispersion system of cristobalite fine powder, and dry to a finished product. The invention can not only effectively reduce the wall thickness of the ceramic mold shell, but also effectively and reliably enhance the structural strength of the ceramic mold shell when the superalloy is poured, and is conducive to stably and reliably improving the molding quality of castings poured with it.

Description

technical field [0001] The invention relates to investment precision casting technology, in particular to a method for preparing a fused quartz ceramic shell, which is particularly suitable for the precision casting of conjoined blades of gas turbines. Background technique [0002] In the investment casting process, in order to prevent the ceramic shell from breaking out or bulging when the superalloy material is poured, it is necessary to enhance the structural strength of the ceramic shell. The usual technical measure is to increase the number of layers of the ceramic shell. It is realized by increasing the thickness of the ceramic shell. [0003] However, the above technical measures to enhance the structural strength of the ceramic shell tend to cause adhesion between adjacent parts in the ceramic shell, which is especially obvious in the precision casting of multiple castings, such as the multiple castings used in some gas turbine turbines. The investment casting moldi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C1/00
CPCB22C1/00B22C9/04
Inventor 曾洪伍林张松泉杨功显杨照宏巩秀芳赵代银何建
Owner DONGFANG TURBINE CO LTD
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