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A polycrystalline crucible that can be reused many times and its forming method

A technology of multiple repetitions and crucibles, which is applied in the field of crucibles, can solve the problems of few times of reusable use, high use and production costs, and only a few times of repeated use, so as to achieve long service life, enhanced corrosion resistance, Good toughness and stability

Active Publication Date: 2021-11-23
贵州大东风机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the existing crucibles are mainly made by knotting, sintering or pressing. Due to the current crucible formula and the finished product produced by the process are limited by production technology and formula, the heat resistance and toughness of the crucible are poor. , poor stability, and poor corrosion resistance, resulting in short average life of the products produced, easy to break and break, and high use and production costs, resulting in high scrap rates
In addition, most of the existing crucibles are disposable crucibles, and some crucibles can be reused, but the life of the crucible for melting metal is short, and the number of reusable times is small, and generally it can only be reused several times

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A polycrystalline crucible that can be used repeatedly in this embodiment is characterized in that the polycrystalline crucible is composed of the following raw materials according to the percentage of the total weight of raw materials: fused silica 25%, low porosity corundum 35%, zirconia 10%, chromium oxide 30%.

[0027] This embodiment uses low porosity corundum, which is beneficial to improve the heat resistance, toughness and stability of the formed polycrystalline crucible; moreover, the fused silica, low porosity corundum, zirconia and chromium oxide of the present invention melt at high temperature After the interaction, the components can change the crystal structure, reduce the melting temperature and improve the crystal properties; in addition, after the above raw materials are melted at high temperature, the crystal phases can be recombined to form mullite phase, baddeleyite phase, α-alumina phase and glass phase; baddeleyite phase can enhance the corrosion ...

Embodiment 2

[0050] This embodiment 2 is similar to embodiment 1, and its difference from embodiment 1 is that the low porosity corundum in this embodiment is different, and the low porosity corundum in this embodiment is calculated by the percentage of the total weight of raw materials , consists of the following raw materials: 95% aluminum oxide, 3% yttrium oxide, and 2% lanthanum oxide; in this embodiment, the upper components are taken in proportion, and the preparation method of this embodiment is the same as in Example 1; the prepared The porosity of the low porosity corundum is 0.5%, and the density of the prepared low porosity corundum is 4.10g / cm 3 .

[0051] Specifically, the low porosity corundum of this embodiment is used as one of the raw materials to cast the polycrystalline crucible of this embodiment that can be reused many times. The polycrystalline crucible of this embodiment is similar to that of Example 1, and it is The difference is that the polycrystalline crucible o...

Embodiment 3

[0054] This embodiment 3 is similar to embodiment 1, and it is different from embodiment 1 in that the low porosity corundum in this embodiment is different, and the low porosity corundum in this embodiment is calculated by the percentage of the total weight of raw materials , consists of the following raw materials: 98% aluminum oxide, 1.5% lanthanum oxide, and 0.5% yttrium oxide; in this embodiment, the upper components are taken in proportion, and the preparation method of the porosity corundum of the present embodiment is the same as that of embodiment 1; The obtained low porosity corundum has a porosity of 0.9%, and the obtained low porosity corundum has a density of 4.0 g / cm 3 .

[0055] Specifically, the low porosity corundum of this embodiment is used as one of the raw materials to cast the polycrystalline crucible of this embodiment that can be reused many times. The polycrystalline crucible of this embodiment is similar to that of Example 1, and it is The difference...

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Abstract

The invention discloses a multi-reusable polycrystalline crucible and a molding method thereof, and relates to the technical field of crucibles; the polycrystalline crucible is composed of the following raw materials according to the percentage of the total weight of raw materials: fused silica 25%-35 %, low porosity corundum 25%-35%, zirconia 10%-40%, chromium oxide 10%-30%. Fused quartz, low porosity corundum, zirconia, and chromium oxide of the present invention interact with each other after melting at high temperature to change the crystal structure between the components; in addition, after the raw materials are melted at high temperature, the crystal phases recombine to form a The mullite phase improves the heat resistance of the crucible, the baddeleyite phase enhances the erosion resistance of the crucible, the α-alumina phase enhances the stability of the crucible, and the glass phase enhances the compactness of the crystal; thus making The formed polycrystalline crucible has the advantages of good heat resistance, good toughness, high stability, strong corrosion resistance, and is not easy to break and break.

Description

technical field [0001] The invention relates to the technical field of crucibles, in particular to a reusable polycrystalline crucible and a forming method thereof. Background technique [0002] At present, the existing crucibles are mainly made by knotting, sintering or pressing. Due to the current crucible formula and the finished product produced by the process are limited by production technology and formula, the heat resistance and toughness of the crucible are poor. , poor stability, and poor corrosion resistance, resulting in short average life of the products produced, easy to break and break, and high use and production costs, resulting in high scrap rates. In addition, most of the existing crucibles are disposable crucibles, and some crucibles can be reused. However, the life of the crucibles for melting metals is short, and the number of reusable times is small. Generally, they can only be used several times. Contents of the invention [0003] Therefore, in vie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/185C04B35/622C04B35/657
CPCC04B35/185C04B35/622C04B35/657C04B2235/3217C04B2235/3225C04B2235/3227C04B2235/3241C04B2235/3244
Inventor 钟行佳黄昌辉王小多张贵宝
Owner 贵州大东风机械有限公司
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