nb‑ti‑zr‑nb 5 the si 3 Composite material and its preparation method

A technology of nb-ti-zr-nb5si3, composite material, applied in the field of Nb-Ti-Zr-Nb5Si3 composite material and its preparation, can solve the problem that room temperature fracture toughness, high temperature mechanical properties and oxidation resistance have not reached a good balance, The mechanical properties and anti-oxidation properties are reduced, and the mechanical properties at room temperature and high temperature are poor.

Active Publication Date: 2017-12-05
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nb 3 Si has a low melting point, poor mechanical properties at room temperature and high temperature, and is unstable, resulting in a decrease in the mechanical properties and oxidation resistance of Nb-Si composite materials, reducing the reliability of the material
In addition, the room temperature fracture toughness, high temperature mechanical properties and oxidation resistance of Nb-Si composite materials have not reached a good balance, so they cannot be used in high temperature and ultra high temperature air environments

Method used

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  • nb‑ti‑zr‑nb <sub>5</sub> the si <sub>3</sub> Composite material and its preparation method
  • nb‑ti‑zr‑nb <sub>5</sub> the si <sub>3</sub> Composite material and its preparation method
  • nb‑ti‑zr‑nb <sub>5</sub> the si <sub>3</sub> Composite material and its preparation method

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Effect test

Embodiment 1

[0027] In this embodiment Nb-Ti-Zr-Nb 5 Si 3 The composite material is made of the following raw materials in mass percentage: Titanium 5%, Zirconium 3%, Nb 5 Si 3 25%, and the balance is niobium; the raw materials are all powdery raw materials, namely: titanium is titanium powder with a particle size not greater than 5 μm, zirconium is zirconium powder with a particle size not greater than 6 μm, Nb 5 Si 3 Nb with a particle size not greater than 5 μm 5 Si 3 Niobium powder, niobium is niobium powder with a particle size not greater than 8 μm, of which titanium powder, zirconium powder and Nb 5 Si 3 The mass purity of the niobium powder is not less than 99%, and the mass purity of the niobium powder is not less than 99.9%.

[0028] In this embodiment Nb-Ti-Zr-Nb 5 Si 3 The preparation method of composite material comprises the following steps:

[0029] Step 1. Weigh each raw material according to the mass percentage, then ball mill the weighed raw materials and mix them...

Embodiment 2

[0035] This embodiment is the same as embodiment 1, wherein the difference is: Nb-Ti-Zr-Nb 5 Si 3 The composite material is made of the following raw materials in mass percentage: titanium 15%, zirconium 8%, Nb 5 Si 3 55%, and the balance is niobium.

[0036] Nb-Ti-Zr-Nb prepared in this embodiment 5 Si 3 The room temperature fracture toughness of the composite material is 15MPa m 1 / 2 ; Compressive strength at 1300°C is 1024MPa; material loss after oxidation in air at 1200°C for 100h is 0.08mg / cm 2 , indicating that the composite material has the characteristics of high strength, high toughness and excellent oxidation resistance, and can be used in high temperature and ultra-high temperature air environments.

Embodiment 3

[0038] This embodiment is the same as embodiment 1, wherein the difference is: Nb-Ti-Zr-Nb 5 Si 3 The composite material is made of the following raw materials in mass percentage: titanium 8%, zirconium 4.5%, Nb 5 Si 3 35%, the balance is niobium.

[0039] Nb-Ti-Zr-Nb prepared in this embodiment 5 Si 3 The room temperature fracture toughness of the composite is 23MPa m 1 / 2 ; Compressive strength at 1300°C is 812MPa; material loss after oxidation in air at 1200°C for 100h is 0.09mg / cm 2 , indicating that the composite material has the characteristics of high strength, high toughness and excellent oxidation resistance, and can be used in high temperature and ultra-high temperature air environments.

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Abstract

The invention provides a Nb-Ti-Zr-Nb5Si3 composite. The Nb-Ti-Zr-Nb5Si3 composite is composed of, by mass, 5%-15% of Ti, 3%-8% of Zr, 25%-55% of Nb5Si3 and the balance Nb. The invention further provides a preparation method of the Nb-Ti-Zr-Nb5Si3 composite. The preparation method comprises the following steps that firstly, the raw materials are weighed and taken according to the mass percents, the weighed raw materials are subjected to ball milling, mixed evenly, and dried under a vacuum condition, and mixed powder is obtained; secondly, the mixed powder is subjected to compression molding to obtain blanks; thirdly, the blanks are put into a shell, and the shell is sealed after being vacuumized; and fourthly, hot isostatic pressing sintering is conducted, and the Nb-Ti-Zr-Nb5Si3 composite is obtained. The Nb-Ti-Zr-Nb5Si3 composite has the characteristics of high strength, high toughness, good oxidation resistance and the like, and can be used in high-temperature and ultrahigh-temperature air environments.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a kind of Nb-Ti-Zr-Nb 5 Si 3 Composite materials and methods for their preparation. Background technique [0002] Nb-Si composite materials have low density, high melting point, high temperature strength and good oxidation resistance, and are considered to be one of the most promising next-generation ultra-high temperature structural materials. At present, the methods for preparing Nb-Si composite materials mainly include: casting method, vacuum consumable arc melting method, electron beam melting method, powder metallurgy technology, etc. The microstructure of Nb-Si composite materials prepared by these methods is composed of Nbss, Nb 5 Si 3 and a large amount of Nb 3 Si composition. Nb 3 Si has low melting point, poor mechanical properties at room temperature and high temperature, and is unstable, which leads to the decline of mechanical properties and oxidat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/02C22C32/00C22C29/18C22C1/05
CPCB22F3/15C22C1/05C22C1/051C22C27/02C22C29/18C22C32/0078
Inventor 喻吉良郑欣张如李来平张文裴雅王峰郭林江夏明星蔡小梅
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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