Preparation method of clay quartz crucible for high-temperature alloy casting

A quartz crucible and superalloy technology, applied in the field of refractory materials for high-temperature alloy precision casting, to solve the problem of inability to plastically form, improve high refractoriness and chemical stability, and meet the requirements of service temperature and thermal shock resistance

Inactive Publication Date: 2020-06-26
LIAONING SILICATE RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of precision casting of superalloys, crucibles are usually used to contain materials that are melted, decomposed or transformed at high temperatures, which requires the crucible to have good thermal stability and high refractoriness to ensure that the superalloy is melted in the crucible. The crucible does not crack, fall off, or react with superalloys, but the existing crucibles cannot meet the above requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Raw materials and ratio:

[0030] Basic material: ball clay powder 30%; quartz glass powder: 45%; white corundum powder: 20%; mullite powder: 5%;

[0031] Water: 25% of the sum of the mass of basic materials;

[0032] Wherein, the particle size of the spherical clay powder is a powder below 80 mesh; the D50 of the white corundum powder is 2.6 μm; the D50 of the mullite powder is 8.9 μm;

[0033] In terms of mass percentage, the quartz glass powder includes 68% of particles passing through a 60-100 mesh sieve, and 32% of particles passing through a 100-150 mesh sieve;

[0034] The raw material components of ball clay and mullite are shown in Table 1. The silica content in the quartz glass powder is greater than 99.9%, and the alumina content in the white corundum powder is greater than 99%.

[0035] The specific preparation method is:

[0036] (1) Mull preparation: Weigh spherical clay powder, quartz glass powder, white corundum powder, mullite powder and water in pro...

Embodiment 2

[0041] Raw materials and ratio:

[0042] Basic materials: ball clay powder 28%; quartz glass powder 46%; white corundum powder 22%; mullite powder 4%;

[0043] Water: the sum of the mass of basic materials is 23%;

[0044] Among them, spherical clay powder with a particle size below 80 mesh sieve; white corundum powder D 50 At 3.6 μm; mullite powder D 50 at 7.9 μm;

[0045] In terms of mass percentage, the quartz glass powder includes 65% of particles passing through a 60-100 mesh sieve, and 35% of particles passing through a 100-150 mesh sieve;

[0046] The raw material components of ball clay and mullite are shown in Table 1. The silica content in the quartz glass powder is greater than 99.9%, and the alumina content in the white corundum powder is greater than 99%.

[0047] The specific preparation method is:

[0048] (1) Mull preparation: Weigh spherical clay powder, quartz glass powder, white corundum powder, mullite powder and water in proportion, first add the basi...

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Abstract

The invention provides a preparation method of a clay quartz crucible for high-temperature alloy casting. The preparation method comprises the following steps: preparing pug, refining the pug, molding, drying and sintering. The pug comprises a basic material and water, and the basic material comprises the following components in percentage by mass: 25-30% of ball clay powder; 40-50% of quartz glass powder; 20-25% of white corundum powder; and 1%-5% of mullite powder. According to the clay quartz crucible, the raw material variety, the adding proportion and the raw material granularity are reasonably controlled; the adverse effect of clay on the thermal stability of the crucible is avoided, the problem that a pure quartz crucible cannot be plastically formed is solved, the requirements of high-temperature alloy on the use temperature and thermal shock resistance of the crucible are met, meanwhile, the sintering temperature of the crucible is 500 DEG C lower than that of a traditional magnesium crucible, and the sintering condition is easier to meet.

Description

technical field [0001] The invention belongs to the field of refractory materials for high-temperature alloy precision casting, and in particular relates to a preparation method of a clay-quartz crucible for high-temperature alloy casting. Background technique [0002] High-temperature alloy precision casting is also called investment casting. It is a near-net-size casting process that can be used to produce high-temperature alloy castings with complex shapes and high product size requirements. The cast parts have high surface finish and accurate dimensions. Generally, no Secondary processing. High-temperature alloy castings have the characteristics of high-temperature resistance, and are widely used in aircraft engines, gas turbines and other parts that work in high-temperature environments. Due to the extremely harsh working environment of these castings, the requirements for the high-temperature alloy casting process and high-temperature alloy composition are extremely st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/14
CPCC04B35/14C04B35/66C04B2235/3217C04B2235/3463C04B2235/349C04B2235/786
Inventor 张全河候振鹤王艳高琳琳毕家林薛健
Owner LIAONING SILICATE RES INST
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