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Manufacturing method of high-purity tantalum oxide body crucible

A manufacturing method and technology of tantalum oxide, which is applied in the field of manufacturing high-purity tantalum oxide body crucibles, can solve the problems of low water absorption and thermal shock resistance, and achieve the effects of small deformation, long service life and good thermal shock resistance

Inactive Publication Date: 2018-08-03
JIUJIANG TANBRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for manufacturing a high-purity tantalum oxide body crucible, which solves the problem of manufacturing a high-purity tantalum oxide body crucible. The method has reasonable technology, low manufacturing cost, and the obtained product has high strength, good purity, and water absorption Low rate, good thermal shock resistance, small deformation, basically no defects such as cracking, long service life and high durability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Prepare high-purity tantalum oxide powder, 65% high-purity tantalum oxide, 23% ultra-pure water, 12% adhesive (PVA content 5%), then add 300mL dispersant (A135) solution into 300L wet in the mill;

[0031] 2. Add 40 kg of tantalum alloy balls;

[0032] 3. The powder mixture was ball milled for 2 hours, and the sizing liquid was passed through an 800-mesh sieve, and then spray-dried to obtain near-spherical high-purity tantalum oxide particles with a fluidity of less than 120 seconds;

[0033] 4. Take 1.75kg of granulated high-purity tantalum oxide and put it into the mold, and lock the rubber mold tightly to prevent water leakage;

[0034] 5. Put the loaded mold into the isostatic pressure cylinder, slowly increase the pressure to 105 MPa for 15 minutes, then slowly reduce the pressure to 75 MPa and hold the pressure for 5 minutes, then drop it to 50 MPa and hold the pressure for 5 minutes. Keep the pressure at 17 MPa for 5 minutes, then drop to normal pressure;

...

Embodiment 2

[0048] 1. Prepare high-purity tantalum oxide powder, 67% high-purity niobium oxide, 23% ultra-pure water, 11% adhesive (PVA content 5%), and then add 250mL dispersant (A135) solution into 300L wet in the mill;

[0049] 2. Add 40kg of tantalum alloy balls;

[0050] 3. The powder mixture was ball milled for 2 hours, and the slurry was passed through a 500-mesh sieve, then spray-dried to obtain near-spherical high-purity tantalum oxide particles with a fluidity of less than 100 seconds;

[0051] 4. Take 1.85kg of high-purity tantalum oxide and put it into the mold, and lock the rubber mold tightly to prevent water leakage;

[0052] 5. Put the loaded mold into the isostatic pressure cylinder, slowly increase the pressure to 105 MPa for 5 minutes, then slowly reduce the pressure to 75 MPa and hold the pressure for 3 minutes, then drop it to 50 MPa and hold the pressure for 2 minutes, then down to normal pressure;

[0053] 6. Open the isostatic cylinder cover, take out the mold, ...

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Abstract

The invention discloses a manufacturing method of a high-purity tantalum oxide body crucible. The technical scheme of the manufacturing method is as follows: carrying out proportioning on high-puritytantalum oxide powder, and carrying out granulation, pressing, drying, high-temperature sintering, annealing, polishing and finishing. The method has the advantages of reasonable process and low manufacturing cost, and the obtained product has the advantages of high strength, good purity, low water absorption, good thermal shock resistance, small deformation, almost no defects of cracking and thelike, long service period and high durability.

Description

technical field [0001] The invention relates to a method for manufacturing a high-purity tantalum oxide bulk crucible. Background technique [0002] At present, the production methods of tantalum oxide body crucible mainly include slip casting method, hot die casting or injection molding method, isostatic pressing method and so on. The grouting molding method is completely realized by the gypsum mold absorbing water. The green body has a density gradient distribution, which is easy to form uneven deformation, and it is difficult to obtain high-strength and high-purity products. The hot die casting or injection molding method needs to add a certain amount of paraffin, which makes the degreasing process cumbersome and high in production cost. The melting or evaporation of the binder reduces the strength of the green body, and it is easy to form defects or even crack and collapse. The isostatic pressing molding method has high strength, does not introduce impurities, and effec...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/96
Inventor 张和鹏张镇张浩戴和平
Owner JIUJIANG TANBRE
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