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Method for preparing NbAl3 intermetallic compound

An intermetallic compound, ball milling technology, applied in niobium compounds, chemical instruments and methods, inorganic chemistry, etc., to achieve the effects of easy operation, uniform structure and simple preparation process

Inactive Publication Date: 2009-03-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for preparing NbAl 3 The method of intermetallic compounds, the plasma discharge sintering of the alloy powder after high-energy ball milling can not only solve the problem of preparing NbAl 3 Nb 2 Al problem, and at the same time can obtain better oxidation resistance and mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Ball milling powder for 90 minutes and spark plasma sintering at 1000°C

[0013] Raw materials: 50.73g of Nb powder (-100 mesh), 49.27g of Al powder (-300 mesh).

[0014] After fully mixing the above raw material powders, weigh 10g of the mixed powder and put it into a stainless steel ball mill tank, add grinding balls, the ball-to-material ratio (the ratio of the mass of the stainless steel balls in the tank to the mass of the powder) is 8:1, and then add 0.1g of stearin Acid, experimental three-dimensional vibrating high-energy ball mill, start ball milling, ball milling time is 90 minutes, stop every 15 minutes during the ball milling process for 10 minutes, in order to cool down and check the machine, separate the powder and balls after grinding, and dry the powder in a vacuum drying oven. The powder after ball milling for 90 min was placed in a graphite mold, heated to a sintering temperature of 1000 °C at a rate of 100 °C / min, and then kept for 10 min w...

Embodiment 2

[0015] Example 2: Ball milling powder for 180 minutes and spark plasma sintering at 1000°C

[0016] Raw material: with embodiment 1. After fully mixing the raw material powder, weigh 10g of the mixed powder and put it into a stainless steel ball mill tank, add grinding balls, the ball-to-material ratio is 10:1, then add 0.08g of zinc stearate, start the ball mill, the ball milling time is 180min, the ball milling process Stop for 10 minutes every 15 minutes in order to cool down and check the machine. After grinding, separate the powder and balls, and dry the powder in a vacuum oven. The powder after ball milling for 180 minutes was placed in a graphite mold, and the temperature was raised to a sintering temperature of 1250 degrees Celsius at a rate of 80 degrees Celsius / min, and then kept for 5 minutes while applying a pressure of 20 MPa. The density of the material after sintering is 98.2%, the hardness at room temperature: 760Hv, the compressive strength at room temperatur...

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Abstract

The invention provides a method for preparing an NbAl3 intermetallic compound and belongs to the technical field of intermetallic compound. The method utilizes a powder metallurgical method; pure Nb powder and pure Al powder are mixed according to the atom percentage: 24 to 26 at percent of Nb and 74 to 76 at percent of Al; the mixture is subjected to ball milling in a high-energy ball miller for 30 to 360 minutes; and the ball miller is shut down for 10 to 15 minutes every 15 to 20 minutes. In ball milling, a ball milling medium is added. The powder after ball milling is put to a module and is sintered in a discharge plasma machine; the sintering temperature is between 1,000 and 1,649 DEG C; and in the sintering process, the powder is heated to the sintering temperature at the speed of between 50 and 100 DEG C / minute, is kept warm for 5 to 10 minutes, is applied with pressure of between 20 and 40 MPa and is cooled to the room temperature. The method has the advantages that the method can prepare the NbAl3 intermetallic compound with density of more than 96.7 percent and even tissue, contains no Nb2Al intermetallic compound, and has good antioxygenic property and mechanical property, simple process and easy operation.

Description

technical field [0001] The invention belongs to the technical field of preparation of intermetallic compounds, and in particular provides a method for preparing high-performance NbAl by powder metallurgy technology. 3 The method of intermetallic compounds. Background technique [0002] With the development of the aerospace industry, the performance requirements for high-temperature structural materials are getting higher and higher, and it is expected that high-temperature structural materials can withstand higher temperatures and have greater specific strength. Refractory intermetallic compounds with extremely high melting points have attracted much attention due to their high melting point, low density, and excellent high temperature strength and creep resistance. Near-formed niobium alloys are intended to replace nickel-based superalloys used in key hot-end parts of aerospace and aero-engines. The melting point of niobium is 2468°C and the density is 8.57g / cm 3 , is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00
Inventor 贾成厂欧阳明亮廉冀琼
Owner UNIV OF SCI & TECH BEIJING
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