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Manufacturing method of corundum crucible for vacuum induction melting superalloy

A vacuum induction melting and high-temperature alloy technology, which is applied in the field of metallurgy, can solve the problems of poor high-temperature chemical stability of pure corundum, cannot be used as a high-temperature alloy, and poor thermal shock stability. Good thermal shock resistance at high temperature

Inactive Publication Date: 2017-06-30
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the existing pure corundum crucible has poor thermal shock stability and is easy to crack, it cannot be used as a crucible for vacuum induction melting superalloys.
In order to overcome the shortcomings of pure corundum crucible, Chinese patent (ZL 201210440801.0) discloses a corundum spinel crucible and its preparation method, because the high temperature volume stability and thermal shock stability of magnesium aluminum spinel are better than magnesia material , thermal shock resistance is better than corundum, corrosion resistance and redox resistance are better than mullite, the crucible prepared with it has excellent high-temperature performance, but its composition still contains components with poor high-temperature chemical stability compared with pure corundum exist

Method used

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  • Manufacturing method of corundum crucible for vacuum induction melting superalloy

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Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1, the manufacture of corundum crucible for vacuum induction melting superalloy, comprises the following steps:

[0017] 1) After weighing according to the ratio in Table 1, mix it with a dispersant and a binder to obtain a uniform alumina slurry. The dispersant used is ammonium polyacrylate, and the amount added is 0.5% of the total mass of alumina raw materials. The binder is propylene The mixed aqueous solution of amide and N,N'-methylenebisacrylamide, the mass ratio of the two is 10:1, the total mass percentage concentration of the mixed aqueous solution is 14%, and the amount of binder added is the total mass of alumina raw materials 5% of

[0018] 2) Add an initiator to the alumina slurry obtained in step 1), mix at 30°C for 3 minutes, the initiator is 2,2'-azo hydrochloride, and the amount added is 0.3% of the total mass of the alumina slurry;

[0019] 3) The alumina slurry obtained in step 2) was vacuum degassed at 30° C. for 5 minutes, and immediate...

Embodiment 2

[0022] Embodiment 2, the manufacture of a corundum crucible for vacuum induction melting superalloys comprises the following steps:

[0023] 1) After weighing according to the ratio in Table 1, mix it with a dispersant and a binder to obtain a uniform alumina slurry. The dispersant used is ammonium polyacrylate, and the amount added is 1.5% of the total mass of the alumina raw material. The binder is propylene The mixed aqueous solution of amide and N,N'-methylenebisacrylamide, the mass ratio of the two is 10:1, the total mass percentage concentration of the mixed aqueous solution is 14%, and the amount of binder added is the total mass of alumina raw materials 10% of;

[0024] 2) Add an initiator to the alumina slurry obtained in step 1), and mix at 30°C for 6 minutes. The initiator is piperidine hydrochloride, and the amount added is 0.2% of the total mass of the alumina slurry;

[0025] 3) The alumina slurry obtained in step 2) was vacuum degassed at 30° C. for 5 minutes, ...

Embodiment 3

[0028] Embodiment 3, the manufacture of corundum crucible for vacuum induction melting superalloy comprises the following steps:

[0029] 1) After weighing according to the ratio in Table 1, mix it with a dispersant and a binder to obtain a uniform alumina slurry. The dispersant used is ammonium polyacrylate, and the amount added is 2% of the total mass of the alumina raw material. The binder is propylene The mixed aqueous solution of amide and N,N'-methylenebisacrylamide, the mass ratio of the two is 10:1, the total mass percentage concentration of the mixed aqueous solution is 14%, and the amount of binder added is the total mass of alumina raw materials 15% of;

[0030] 2) Add an initiator to the alumina slurry obtained in step 1), mix at 30°C for 8 minutes, the initiator is 2,2'-azo hydrochloride, and the amount added is 0.15% of the total mass of the alumina slurry;

[0031] 3) The alumina slurry obtained in step 2) was vacuum degassed at 30° C. for 5 minutes, and immedi...

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Abstract

The invention provides a method for manufacturing a corundum crucible for vacuum induction melting superalloys. The steps are as follows: 1) the alumina raw material is composed of tabular corundum with a particle size of 1-4mm, tabular corundum with a particle size of 0.1-1mm, and plate-shaped corundum with a particle size of 0.1mm or less. Shaped corundum, bimodal active α-alumina and nanocrystalline α-alumina are mixed in a mass percentage of 15-40: 15-40: 15-40: 3-8: 3-8, and then alumina raw materials, The dispersing agent and the binding agent are uniformly mixed at a mass ratio of 100:0.5-2:5-15 to obtain alumina slurry; 2) adding 0.1-0.3% of the total mass of alumina slurry to the initiator, Mix at 2-30°C for 3-10min; 3) After vacuum degassing the alumina slurry obtained in step 2) at 2-30°C for 5min, immediately pour it into the crucible forming mold; 4) heat it together with the mold to 45-55 After keeping at ℃ for 5-35 minutes, demoulding, and then drying at room temperature; 5) Place the dried crucible blank at 1500-1650 ℃ for more than 3 hours, and then cool to room temperature to obtain the target product. The content of impurity elements is low when the crucible of the present invention is used to smelt superalloys.

Description

technical field [0001] The invention relates to a method for manufacturing a corundum crucible for vacuum induction melting high-temperature alloys, belonging to the technical field of metallurgy. Background technique [0002] The crucible is a key component in vacuum induction melting superalloys. Under high temperature and vacuum conditions, various physical and chemical interactions will occur between the crucible and the superalloy melt, resulting in erosion of the crucible material and contamination of the melt. Therefore, the crucible material should have good chemical stability. At the same time, the crucible is periodically subjected to heating and cooling during use, causing expansion and contraction stress inside the crucible, resulting in cracks and melt leakage. Therefore, the crucible material is required to have good thermal shock stability. [0003] Oxygen, nitrogen, sulfur, phosphorus and other impurity elements have a significant impact on the mechanical p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/10C04B35/622
Inventor 殷凤仕殷会芳黄连超周丽
Owner SHANDONG UNIV OF TECH
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