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A kind of niobium-based composite material and its preparation method

A composite material and niobium-based technology, which is applied in the field of refractory metal composite material preparation, can solve the problem of low room temperature fracture toughness and achieve high temperature strength, low production cost, and high room temperature fracture toughness.

Inactive Publication Date: 2019-01-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the existing problems of niobium-based composite materials, provide a niobium-based composite material with simple preparation process, low cost, high strength and fracture toughness and its preparation process, and solve the problem of room temperature fracture toughness of niobium-based composite materials. lower question

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  • A kind of niobium-based composite material and its preparation method
  • A kind of niobium-based composite material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0033] (1) Nb foil pretreatment: pickling and alkali washing of Nb foil, the acid composition is HCl: HNO 3 :H 2 O=1:3:16 (volume fraction), the lye composition is NaOH solution with a pH value of 13, then ultrasonically cleaned in alcohol, and dried.

[0034] (2) Slurry preparation: the Nb powder with a particle size of 1 μm and the Si powder with a particle size of 1 μm are put into a ball mill jar by mass percent Nb80%, Si 20% (the purity of the above materials is not less than 99.9%), and The ethanol solution is used as a dispersant, the cemented carbide ball is used as a grinding ball, and the slurry is obtained by wet ball milling for 10 hours; the amount of alcohol is 1.5 times the mass of the ball milled material (the total mass of Nb powder and Si powder), and the ball-to-material ratio is 3 :1, the speed is 200r / min.

[0035] (3) Uniformly coat the slurry and dry: apply the slurry described in (1) evenly on the surface of Nb foil with an average thickness of 20 μm, f...

Embodiment 2

[0039] (1) Nb foil pretreatment: pickling and alkali washing of Nb foil, the acid composition is HCl: HNO 3 :H 2 O=1:3:16 (volume fraction), the lye composition is NaOH solution with a pH value of 13, then ultrasonically cleaned in alcohol, and dried.

[0040] (2) Slurry preparation: the Nb powder with a particle size of 3 μm and the Si powder with a particle size of 1 μm are put into a ball mill jar by mass percentage Nb85%, Si 15% (the purity of the above materials is not less than 99.9%), and The ethanol solution is used as a dispersant, the cemented carbide ball is used as a grinding ball, and the slurry is obtained by wet ball milling for 12 hours; the amount of alcohol is 2.5 times the mass of the ball milled material (the total mass of Nb powder and Si powder), and the ball-to-material ratio is 6 :1, the speed is 300r / min.

[0041] (3) Uniformly coat the slurry and dry: apply the slurry described in (1) evenly on the surface of Nb foil with an average thickness of 25 ...

Embodiment 3

[0045] (1) Nb foil pretreatment: pickling and alkali washing of Nb foil, the acid composition is HCl: HNO 3 :H 2 O=1:3:16 (volume fraction), the lye composition is NaOH solution with a pH value of 13, then ultrasonically cleaned in alcohol, and dried.

[0046] (2) Slurry preparation: the Nb powder with a particle size of 5 μm and the Si powder with a particle size of 1 μm are put into a ball mill jar by mass percent Nb90%, Si 10% (the purity of the above materials is not less than 99.9%), and Ethanol solution is used as dispersant, cemented carbide balls are used as grinding balls, and wet ball milling is carried out for 15 hours to obtain a slurry; the amount of alcohol is 3.5 times the mass of ball milled material (the total mass of Nb powder and Si powder), and the ball-to-material ratio is 10 :1, the speed is 400r / min.

[0047] (3) Uniformly coat the slurry and dry: apply the slurry described in (1) evenly on the surface of Nb foil with an average thickness of 30 μm, for...

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Abstract

The invention discloses a niobium-based composite material and a preparation method, and belongs to the field of refractory metal composite material preparation. The composite material is obtained by pressure sintering performed after Nb / Nb5Si3 stratified structures are stacked. The Nb / Nb5Si3 stratified structures are formed by coating the Nb foil surfaces with coatings. The preparation technology comprises the steps that Nb powder and Si powder are ball-milled to prepare slurry, the slurry evenly coats the Nb foil surfaces, and after the sprayed / dip-coated Nb foil stacking, vacuum hot-pressing sintering is performed under the temperature of 1,500-1,750 DEG C for 3 h to obtain the niobium-based composite material. The slurry components are reasonably prepared, the thermal matching performance of the composite material and Nb foil is good, and the alternately-distributed Nb / Nb5Si3 stratified microstructure is formed, the better high temperature strength is obtained in the direction parallel to the stratified microstructure, and meanwhile the high requirement for indoor temperature breaking tenacity is met in the direction perpendicular to the stratified microstructure. The preparation technology is simple, the production cost is low, the stratified structure is dense and uniform, and the purposes of enhancing the strength and tenacity and lowering the density can be effectively achieved.

Description

technical field [0001] The invention discloses a niobium-based composite material and Nb / Nb 5 Si 3 method of preparation. In particular, it refers to a kind of Nb / Nb 5 Si 3 The invention relates to a niobium-based composite material obtained by pressure sintering after lamination of layered structures and a preparation method thereof; it belongs to the technical field of preparation of refractory metal composite materials. Background technique [0002] With the rapid development of the current aerospace industry, there is a higher demand for high-temperature structural materials with high strength, high toughness, and low density. Niobium alloy is an excellent structural material with high melting point, high strength and high toughness. It has been widely used in aerospace and other fields, especially in aerospace vehicles. Most of the existing niobium alloys are solid-solution strengthened by adding high-melting-point metal elements, which increases the density while ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/04B22F3/14
CPCB22F3/14B22F7/04B22F2003/145B22F2007/042B22F2007/045B22F2999/00B22F2201/20
Inventor 肖来荣余宸旭张贝宋宇峰赵小军刘建飞郭蕾等
Owner CENT SOUTH UNIV