Ni—Al-RE ternary eutectic alloy and preparation method thereof

Patent metadata

Field	Value
Publication number	US-10988833-B2
Application number	US-201716630848-A
Country	US
Kind code	B2
Filing date	Oct 25, 2017
Priority date	Aug 3, 2017
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

A Ni—Al-RE ternary eutectic alloy and a preparation method thereof are provided. The alloy is composed of the following elements by weight percent, aluminum (Al) of 2.50% to 19.50%, rare earth (RE) of 1.30% to 20.0%, other impurity elements being less than or equal to 0.10%, and the rest being nickel (Ni). The microstructure of the alloy is in a completely eutectic form, and the density is 6.8 to 7.1 g/cm3. Raw materials are prepared according to the ratio, and are placed into a vacuum induction smelting furnace; the smelting furnace is vacuumized to 10−5 Pa, power is increased to ensure complete melting of the raw materials, and the molten alloy melt is poured into an iron mold to obtain alloy ingots. The eutectic phase in the microstructure of the alloy in the disclosure has high hardness.

First claim

We claim:

1. A method for preparing a Ni—Al-RE ternary eutectic alloy composed of following elements by weight percent: aluminum (Al) of 2.50% to 19.50%, rare earth (RE) of 1.30% to 20.0%, other impurity elements being less than or equal to 0.10%, and the rest being nickel (Ni), comprising:
preparing raw materials according to a ratio, placing the raw materials in a vacuum induction smelting furnace, vacuumizing to ensure that a vacuum degree reaches 10− Pa, increasing power to ensure complete melting of the raw materials so as to form a molten alloy melt, pouring the molten alloy melt into an iron mold, and obtaining alloy ingots that are formed of the Ni—Al-RE ternary eutectic alloy in a completely eutectic form.

2. The method according to claim 1 , wherein a magnesia crucible is arranged in the vacuum induction smelting furnace, and the raw materials are held in the magnesia crucible.

3. The method according to claim 1 , wherein the increasing the power to ensure the complete melting of the raw materials means that increasing the power of a medium-frequency induction furnace and when the aluminum begins melting, stop increasing the power; wherein the whole alloy material is molten through a reaction between the aluminum and the other two raw materials of the RE and the Ni.

4. The method according to claim 1 , wherein the pouring the molten alloy melt into the iron mold means that further increasing the power after the raw materials are all molten to ensure good fluidity of the alloy during the pouring; then pouring the alloy melt into the iron mold which is preheated to 150 to 250° C.; and taking out the cast ingots after the alloy melt is cooled, thereby obtaining the ternary alloy.

Assignees

• Univ Shanghai Jiaotong
• Zhongchao Hangyu Invest Casting S&T Co

Inventors

• Wang Jun
• Wu Yun
• Kang Maodong
• Gao Haiyan
• He Shuxian
• Liu Yahui

Classifications

• C22C19/03 Primary

  based on nickel · CPC title

• C22C21/00

  Alloys based on aluminium · CPC title

• C22C1/02

  by melting {(C22C1/1036 takes precedence)} · CPC title

• C22C1/023 Primary

  Alloys based on nickel · CPC title