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Preparation method of nickel-calcium intermediate alloy

An intermediate alloy, nickel-calcium technology, applied in the field of metallurgy, can solve the problem that the alloy cannot be quantitatively added with calcium for desulfurization and deoxidation, and achieves the effect of high alloy density, easy measurement and improved utilization.

Active Publication Date: 2019-12-20
江苏隆达超合金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of desulphurization and deoxidation by quantitatively adding calcium to alloys smelted and returned to nickel under vacuum smelting

Method used

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  • Preparation method of nickel-calcium intermediate alloy

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Embodiment 1

[0027] A preparation method of a nickel-calcium master alloy, comprising the following steps:

[0028] (1) Raw material preparation: prepare high-purity nickel plates with a purity of more than 99% and calcium metal with a purity of more than 98% and a particle size of 2-5mm. The weight of calcium metal containing nickel is 7 kg; cut the nickel plate into small pieces of 20mm×20mm , with a weight of 93kg, dried in a vacuum oven at a temperature of 110°C and a vacuum of 1×10 -1 Pa;

[0029] (2) Crucible preparation: use calcium oxide crucible, dry in a vacuum oven at a temperature of 110°C, and a vacuum of 1×10 - 1 Pa, the baking time is 2 hours, and the pot is made by dry method;

[0030] (3) Furnace cleaning: test the smelting furnace with high-purity nickel before smelting, so as to check the furnace condition, bake the crucible, and prevent the crucible from getting wet;

[0031] (4) Furnace loading: Add nickel block into the crucible with a temperature of 50°C, and fix...

Embodiment 2

[0044] A preparation method of a nickel-calcium master alloy, comprising the following steps:

[0045] (1) Raw material preparation: prepare high-purity nickel plates with a purity of more than 99% and calcium metal with a particle size of 2-5mm. The calcium metal contains nickel and the weight is 8 kg; cut the nickel plate into small pieces of 40mm×40mm, The weight is 42kg, and it is dried in a vacuum oven at a temperature of 110°C and a vacuum of 1×10 -1 Pa;

[0046] (2) Crucible preparation: use calcium oxide crucible, dry in a vacuum oven at a temperature of 110°C, and a vacuum of 1×10 - 1 Pa, the baking time is 4 hours, and the pot is made by dry method;

[0047] (3) Furnace cleaning: test the smelting furnace with high-purity nickel before smelting, so as to check the furnace condition, bake the crucible, and prevent the crucible from getting wet;

[0048] (4) Furnace loading: Add nickel block into the crucible with a temperature of 50°C, and fix the metal calcium co...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a preparation method of a nickel-calcium intermediate alloy. The preparation method comprises the following steps of raw material preparation, crucible preparation, furnace washing, furnace loading, vacuumizing, argon filling, nickel smelting, calcium smelting, pouring and crushing. On the basis that the melting point of a nickel-calcium alloy is lower than that of metal nickel, the method guarantees that molten metal can be completely melted below the melting point of nickel, after the metal nickel melts,metal calcium is gradually melted by using the enthalpy of the molten metal, the melting point of the alloy is gradually reduced along with melting of the metal calcium, and the nickel-calcium alloy becomes the intermediate alloy. The product can be used in the vacuum metallurgical capacity process, and is convenient to meter and weigh. The alloy is large in density and directly sinks into the bottom of the molten metal after being added into nickel-containing alloy liquid, so that utilization rate of calcium is greatly improved. Due to the characteristic that the melting point of the intermediate alloy is lower than that of pure metal, a good method is provided for the intermediate alloy with the boiling point close to the melting point of another kind of metal.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a preparation method of a nickel-calcium master alloy. Background technique [0002] As a very active metal, calcium metal is a powerful reducing agent. Its main uses include: deoxidation, desulfurization, and degassing during metal smelting. Calcium is chemically active and can form a layer of oxide or nitride film on the surface in the air, which can slow down further corrosion. It can combine with oxygen to form calcium oxide, and combine with nitrogen to form calcium nitride Ca 3 N 2 , combined with fluorine, chlorine, bromine, iodine, etc. to form the corresponding halides, and hydrogen to form calcium hydride under the action of a catalyst at 400 °C. React with water at room temperature to generate calcium hydroxide and release hydrogen, react with hydrochloric acid, dilute sulfuric acid, etc. to generate salt and hydrogen, and react with carbon at high te...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C19/03C22F1/10
CPCC22C1/023C22C1/03C22C19/03C22F1/10
Inventor 高鑫周向东浦海涌郑晓飞
Owner 江苏隆达超合金股份有限公司