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Composite modified ceramic shell and preparation method thereof

A compound modified, ceramic-type technology, which is applied to casting molding equipment, casting molds, cores, etc., can solve the problems of uneven fiber and powder mixed slurry, reduce the number of coating layers, reduce labor intensity, change small effect

Inactive Publication Date: 2019-01-04
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention adopts the method of mixing zirconia fiber and graphite powder into the shell for the first time, and pre-wetting the zirconia fiber and graphite powder by silica sol to overcome the problem of inhomogeneity of the mixed slurry of fiber and powder

Method used

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  • Composite modified ceramic shell and preparation method thereof
  • Composite modified ceramic shell and preparation method thereof
  • Composite modified ceramic shell and preparation method thereof

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Embodiment Construction

[0029] The present invention is further described in detail with the given examples below, so as to completely and accurately understand the characteristics of the present invention.

[0030] The following is a specific embodiment given by the inventor.

[0031] A method for preparing a composite modified ceramic shell of zirconia fiber and graphite powder according to the present invention comprises the following steps:

[0032] (1) Prepare three buckets of slurry A, B, and C, wherein bucket A is the slurry for the surface layer, bucket B is the slurry for the transition layer, and bucket C is the slurry for the back layer. The mass ratio of fused corundum to silica sol in barrel A is 3.0:1, the mass ratio of fused corundum to silica sol in barrel B is 2.6:1, and the mass ratio of fused corundum to silica sol in barrel C is 2.8:1 ;

[0033] (2) Open A, B, C mixing tanks (L type), pour 40kg, 40kg, 38kg of silica sol respectively, according to the wetting agent and defoamer a...

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Abstract

The invention relates to the fields of directional solidification and investment casting, in particular to a zirconia fiber and graphite powder composite modified ceramic shell and a preparation method thereof. According to the preparation method, by adjusting technological parameters, good connection action of a duplication wax pattern surface of a surface layer and a transition layer is ensured;by adding zirconium oxide fibers and graphite powder into a back layer, the strength and heat dispersion of the shell are improved; after sizing, stuccoing and drying are conducted many times, dewaxing and sintering are conducted to prepare the shell. The characteristics that the strength of the zirconium oxide fibers is high, and the zirconium oxide fibers keep in a fiber condition at a high temperature are utilized, and the high-temperature strength of the shell can be remarkably improved; when alloy liquid is cooled, due to the high heat conductivity of the graphite powder, the heat dispersing speed of the shell is effectively improved, and the production requirements of the ceramic shell are well met.

Description

technical field [0001] The invention relates to the fields of directional solidification and investment casting, in particular to a composite modified ceramic shell by adding zirconia fiber and graphite powder and a preparation method thereof. Background technique [0002] In the process of directional solidification pouring, an excellent ceramic shell is an important guarantee for the manufacture of precision castings. It generally has the following requirements: (1) suitable room temperature strength, which can resist dewaxing and cracking during handling to a certain extent; (2) Sufficient high temperature strength, able to withstand the thermomechanical impact of high temperature molten alloy liquid without cracking; (3) good heat dissipation, forming a large temperature gradient; (4) good collapsibility, easy to shell. Although increasing the number of coating layers can improve its strength, it will reduce the heat dissipation of the shell, prolong the production time ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C3/00B22C1/18
CPCB22C1/186B22C3/00B22C9/04
Inventor 贾志宏郭振赵玉涛田宇李风超
Owner JIANGSU UNIV
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