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Purification smelting method for nickel-based high-temperature alloy master alloy

A technology of nickel-based superalloys and superalloys, which is applied in the field of purification and smelting of superalloys. It can solve the problems of ceramic pollution, inability to remove harmful elements such as sulfur, and inability to effectively remove non-metallic inclusions, so as to achieve convenient operation and avoid pollution. Effect

Active Publication Date: 2018-09-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for high-temperature alloys that require high purity, VIM technology still has the following shortcomings: the pollution of ceramic crucibles; the inability to remove harmful elements such as sulfur and phosphorus; the inability to effectively remove non-metallic inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Purified smelting of FGH96 superalloy master alloy

[0021] Use bulk pure nickel, pure chromium, pure cobalt, pure tungsten, pure molybdenum, pure niobium, pure aluminum, pure titanium, high-purity graphite, boron, zirconium, etc. as raw materials, and the purity of each raw material is greater than 99.9%. Metal raw materials Pretreatment is carried out in 5vol.% hydrochloric acid aqueous solution to remove surface oxides, and the pretreatment time is 30 minutes; then various metal raw materials are placed in absolute ethanol for ultrasonic treatment, and the treatment time is 15 minutes. Formulated CaF 2 10wt.% CaO-CaF 2 The slag is pre-melted, kept for 25 minutes after being completely melted, then cooled, and mechanically broken into pre-melted slag with a particle size of 1mm. Then the pre-melted slag and pure nickel powder are uniformly mixed at a ratio of 1:1 and pressed into blocks. The briquette is baked at 220° C. for 7 hours to remove moisture th...

Embodiment 2

[0022] Example 2: Purified smelting of FGH96 superalloy master alloy

[0023] Use bulk pure nickel, pure chromium, pure cobalt, pure tungsten, pure molybdenum, pure niobium, pure aluminum, pure titanium, high-purity graphite, boron, zirconium, etc. as raw materials, and the purity of each raw material is greater than 99.9%. Metal raw materials Pretreatment is carried out in 5vol.% hydrochloric acid aqueous solution to remove surface oxides, and the pretreatment time is 30 minutes; then various metal raw materials are placed in absolute ethanol for ultrasonic treatment, and the treatment time is 15 minutes. Formulated CaF 2 15wt.% CaO-CaF 2 The slag is pre-melted, kept for 25 minutes after being completely melted, then cooled, and mechanically broken into pre-melted slag with a particle size of 1mm. Then the pre-melted slag and pure nickel powder are uniformly mixed at a ratio of 1:2 and pressed into blocks. The briquette is baked at 230° C. for 8 hours to remove moisture th...

Embodiment 3

[0024] Example 3: Purified smelting of GH4169 superalloy master alloy

[0025] Use bulk pure nickel, pure chromium, pure molybdenum, pure niobium, pure aluminum, pure titanium, pure iron, high-purity graphite, boron, zirconium, etc. as raw materials, and the purity of each raw material is greater than 99.9%. % hydrochloric acid aqueous solution for pretreatment to remove surface oxides, the pretreatment time is 25min; then various metal raw materials are placed in absolute ethanol for ultrasonic treatment, the treatment time is 15min. Formulated CaF 2 Percentage is wt.10% CaO-CaF 2 The slag is pre-melted, kept for 25 minutes after being completely melted, then cooled, and mechanically broken into pre-melted slag with a particle size of 1mm. Then the pre-melted slag and pure nickel powder are uniformly mixed at a ratio of 1:1 and pressed into blocks. The briquette is baked at 220° C. for 7 hours to remove moisture therein before use. First put Ni, Cr, Mo, Fe, and compacts, ...

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PUM

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Abstract

A purification smelting method for a nickel-based high-temperature alloy master alloy comprises the following steps: (1) carrying out hydrochloric acid and ultrasonic treatment of a metal raw material; preparing CaO-CaF2 pre-melted slag; and uniformly mixing the pre-melted slag and a pure nickel powder, and pressing into a block; (2) placing the raw material and the press block together into a crucible, and vacuumizing; adding C, Nb, Ti and Al after melting; filling with argon gas, adding B and Zr until an alloy liquid is molten again, and pouring into a steel mold, to obtain a high temperature alloy ingot; and removing oxide scale and risers of the ingot, to obtain a high temperature alloy concentrate; and (3) putting the concentrate into a copper crucible; vacuumizing, melting, and rapidly solidifying, to obtain the high temperature alloy master alloy. Slag refining is performed during vacuum induction smelting, and the sulfur and phosphorus content is low; the copper crucible can avoid the pollution of the crucible to an alloy melt; magnetic suspension can promote non-metallic inclusions to float upwards; the content of oxygen and nitrogen is low, so the amount of non-metallic inclusions formed in the cooling and solidification processes of the alloy liquid is reduced; the conventional mature smelting device is used, and the operation is convenient.

Description

technical field [0001] The invention belongs to the field of purified smelting of high-temperature alloys, and relates to the smelting of nickel-based high-temperature alloys. Background technique [0002] Nickel-based superalloys are the preferred materials for aeroengine hot-end parts (blades and turbine disks), and the purity of the master alloy is a key factor affecting its service life. The purity of the master alloy includes oxygen, nitrogen, sulfur, phosphorus and other harmful elements and non-metallic inclusions. At present, the purification melting technology of superalloy master alloy is mainly vacuum induction melting (Vacuum Induction Melting, VIM). The advantages of vacuum induction melting technology are mature technology, simple and easy to implement, and widely used in industrial production. However, for high-temperature alloys that require high purity, VIM technology still has the following shortcomings: the pollution of ceramic crucibles; the inability t...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C1/03C22C19/03
CPCC22C1/023C22C1/03C22C19/03
Inventor 章林高小勇曲选辉陈晓玮宋利军
Owner UNIV OF SCI & TECH BEIJING
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