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Preparation method of Y2O3 crucible and application in high-activity metal smelting

A high-activity, crucible technology is applied in the field of the preparation of smelting vessels and the preparation of refractory crucibles. The effect of complete crucible structure and low oxygen content in the alloy

Inactive Publication Date: 2017-11-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the existing preparation Y 2 o 3 The strength of the crucible material is not ideal, and it is easy to crack when it is used in the smelting process of high-activity metals. The prepared high-activity metal materials are prone to hole defects, and the quality is difficult to guarantee, which affects the performance of the alloy. This has become an urgent technical problem to be solved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this example, a Y 2 o 3 The preparation method of crucible comprises the steps:

[0021] a. Dry Y with a purity ≥ 99.9 2 o 3 The powder is pressed under 120Mpa to form a crucible biscuit;

[0022] b. Pre-sintering the crucible green body prepared in step a at 1000° C. for 4 hours;

[0023] c. Using the solid phase sintering method, the crucible green body pre-sintered in the step b is kept at 1750° C. for 4 hours, and then sintered at a high temperature to obtain Y 2 o 3 The finished crucible.

[0024] A present embodiment Y 2 o 3 Crucible preparation method Y prepared 2 o 3 The application of crucible in Zr-4 alloy smelting comprises the following steps:

[0025] ① Use crucible-type vacuum induction melting process, adopt vacuum induction melting furnace (WZF-2 type), choose Y 2 o 3 Crucible preparation method Y prepared 2 o 3 The crucible is used as a melting vessel for the crucible-type vacuum induction melting process. With magnesia as the substrat...

Embodiment 2

[0030] This embodiment is basically the same as Embodiment 1, especially in that:

[0031] In this example, a Y 2 o 3 The preparation method of crucible comprises the steps:

[0032] a. Dry Y with a purity ≥ 99.9 2 o 3 The powder is pressed under 100Mpa to form a crucible biscuit;

[0033] b. Pre-sintering the crucible green body prepared in step a at 800° C. for 6 hours;

[0034] c. Using the solid phase sintering method, the crucible green body pre-sintered in the step b is kept at 1750° C. for 2 hours, and then sintered at a high temperature to obtain Y 2 o 3 The finished crucible. Although this example uses a lower pressure than Example 1 to form the biscuit, and also uses a lower temperature for pre-sintering, and uses only 50% of the high-temperature sintering time of Example 1 for solid-phase sintering, but the preparation of Y 2 o 3 The crucible also has good strength and is not easy to crack.

[0035] A present embodiment Y 2 o 3 Crucible preparation metho...

Embodiment 3

[0041] This embodiment is basically the same as the previous embodiment, and the special features are:

[0042] In this example, a Y 2 o 3 The preparation method of crucible comprises the steps:

[0043] a. Dry Y with a purity ≥ 99.9 2 o 3 The powder is pressed under 140Mpa to form a crucible biscuit;

[0044] b. Pre-sintering the crucible green body prepared in step a at 1000° C. for 6 hours;

[0045] c. Using the solid phase sintering method, the crucible green body pre-sintered in the step b is kept at 1750° C. for 6 hours, and then sintered at a high temperature to obtain Y 2 o 3 The finished crucible. Although this example adopts a higher pressure than that of Example 1 to form the biscuit, and also uses a higher temperature for pre-sintering, and uses only Example 1 for longer high-temperature sintering time for solid-phase sintering, but the preparation of Y 2 o 3 The crucible also has good strength and is not easy to crack.

[0046] A present embodiment Y 2 ...

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Abstract

The invention discloses a preparation method of Y2O3 crucible and application in high-activity metal smelting. The Y2O3 crucible is prepared by pressing dried Y2O3 powder under 100-140 Mpa to be a crucible biscuit; and applying a solid phase sintering method. The high-activity alloy is smelted by a vacuum sensing furnace and the Y2O3 crucible prepared by the method; power is slowly increased during the smelting process, and Ar gas is back flushed in the smelting process; power is slowly reduced during the cooling process after smelting; thus shortcoming of hole formation caused by quick cooling of the high-activity alloy is avoided, and the crack of the Y2O3 crucible is avoided. After smelting, the alloy component is uniform, the crucible is complete; there is no obvious interface layer between the high-activity alloy and the crucible, and oxygen content in the high-activity alloy is low, and the high-activity alloy performance after being smelted is guaranteed; the technique can adjust corresponding technical parameter according to different alloy characteristics, and has excellent industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method and application of a smelting vessel, in particular to a preparation method of a refractory crucible and its application in metal smelting, which is applied to the technical fields of weather-resistant materials for high-temperature smelting and non-ferrous metal zirconium alloy materials. Background technique [0002] In general, zirconium alloys can be divided into two categories: nuclear grade zirconium alloys and industrial grade zirconium alloys. In the nuclear industry, the thermal neutron absorption cross section of zirconium is small, and for neutrons at 2200m / s, the capture cross section of pure zirconium is only 0.18×10 -28 m 2 , which can ensure that there are enough thermal neutrons in the atomic energy reactor to maintain the normal operation of the reactor. Therefore, zirconium alloys are mainly used as cladding materials for nuclear fuel, structural materials for nuclear reactors, and shield...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/505C04B35/622C04B35/64C22C1/02
CPCC04B35/505C04B35/622C04B35/64C22C1/02
Inventor 李重河李宝同鲁雄刚李柱王世华张东何文英
Owner SHANGHAI UNIV
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