High-temperature and high-specific strength niobium alloy and preparation method thereof

A high specific strength, niobium alloy technology, applied in the field of niobium-based superalloy and its ingots, can solve the problems of insufficiency and high cost, achieve good economic value and social value, and ensure the effect of uniformity

Inactive Publication Date: 2015-01-28
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

C103 alloy has a service temperature of up to 1400°C and 1500°C for a short period of time, and its cost is higher than that of new high-temperature niobium alloys. It can no longer meet the requirements of current aerospace technology research and development. gap

Method used

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  • High-temperature and high-specific strength niobium alloy and preparation method thereof
  • High-temperature and high-specific strength niobium alloy and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] Add 5.1% tungsten and 2.1% molybdenum powder to 93kg metallurgical grade niobium powder, and add 0.2% rare earth element yttrium at the same time. It is required that the excess carbon content of niobium powder is controlled at 1000ppm, and the material is mixed in a V-shaped mixer for 4- 10 hours; the alloy powder is formed by a 500-ton hydraulic steel mold, and then sintered at a high temperature in a vacuum: 2h to 1350°C for 2h, 2h to 1700°C for 2h, 2h to 1850°C for 10-20h, power off for cooling, Make the vacuum greater than 2×10 -2 Pa. The alloy strip and the zirconium plate are assembled according to the weight ratio of 100:1-1.5 to prepare the smelting electrode. Vacuum electron beam furnace is used for two smelting, the melting power is 200kW-500kW, and the smelting speed is 70-100kg / h. The surface of the ingot is polished to eliminate surface defects.

Embodiment 2

[0023] Add 5.1% tungsten, 2.1% molybdenum powder, and 0.2% rare earth element yttrium to 93kg of metallurgical grade niobium powder, and mix in a V-shaped mixer for 4-10 hours; carry out isostatic pressing on the alloy powder Forming, the diameter of the formed billet is Φ80mm, and then sintered by vacuum vertical melting: 70-100kW heat preservation for 1-2 hours, 150-250kW heat preservation for 2-3 hours, power off for cooling. Alloy rods and zirconium plates are assembled according to the weight ratio of 100:1-1.5 to prepare melting electrodes. The first melting uses a vacuum electron beam furnace with a melting power of 200kW-500kW and a melting speed of 70-100kg / h, and the second uses a vacuum For consumable arc melting, the melting power is 300kW-560kW.

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Abstract

The invention relates to a high-temperature and high-specific strength niobium alloy and a preparation method thereof. Main components of the alloy are as shown in the table disclosed in the specification. The preparation method disclosed by the invention comprises the following steps: sintering the mixed materials by adopting a way of powder metallurgy so as to effectively ensure the uniformity of the components of the alloy; and optimizing the structure of a cast ingot so as to achieve the technical requirements of processing of the high-temperature alloy. The mixture ratio of the components of the high-temperature niobium alloy and an ingot casting method can ensure that the cast ingot which is conductive to processing can be produced, the use performance of the final alloy can be achieved, and the high-temperature and high-specific strength niobium alloy has great economic value and social value.

Description

technical field [0001] The invention relates to a method for preparing high-melting-point metals and lower-melting-point metals into niobium-based superalloys and ingots thereof by using powder metallurgy and vacuum electron beam alloying smelting or vacuum arc smelting, especially a high-temperature high-specific-strength niobium alloy Alloys and methods of making them. Background technique [0002] With the rapid development of military and aerospace technology in the world, the advanced defense system integrating air defense and space defense has become a major development goal of our country in the 21st century. As a symbol of a country's military technical strength, it has huge military and political influence. As an important part of the advanced defense system, the kinetic energy kill interceptor and the corresponding missile delivery system also put forward higher requirements for the attitude control engine, not only pursuing high temperature performance, long servi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/02C22C1/05
Inventor 颉维平李明阳陈林牟东陈万和白掌军王忠王秋迎
Owner NINGXIA ORIENT TANTALUM IND
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