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Nb5Si3/SiC composite material and hot pressed sintering preparation method thereof

A composite material, hot pressing sintering technology, applied in the field of composite materials, can solve the problems of inability to form liquid phase, product shape and size limitations, liquid metal infiltration method to prepare composite materials, etc.

Pending Publication Date: 2021-07-06
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a kind of Nb 5 Si 3 / SiC composite material and hot pressing sintering preparation method thereof, adopting hot pressing sintering process method to prepare Nb 5 Si 3 The preparation method of SiC / SiC composite material overcomes the problems that the traditional liquid metal impregnation process is too complicated, the preparation cost is high, and the shape and size of the prepared product are limited; and because Nb 5 Si 3 Intermetallic compounds have a high melting point and cannot form a liquid phase, so for Nb 5 Si 3 / SiC composite materials cannot be prepared by liquid metal infiltration method

Method used

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  • Nb5Si3/SiC composite material and hot pressed sintering preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] NB 5 Si 3 / SiC composite, according to quality percentage, including the following components:

[0028] In NB 5 Si 3 / SiC composite, with NB 5 Si 3 Intermetallic compounds are enhanced toughening phase, with SiC as matrix; where NB 5 Si 3 Intermetallic compound in NB 5 Si 3 The mass fraction in the / SiC composite is 10 wt%.

[0029] The NB 5 Si 3 The intermetallic compound was prepared by mechanical alloying and heat treatment process; NB-Si intermetallic compound powder was prepared by mechanical alloying process ball milling 60h, wherein Nb: Si was 63:37; and the prepared NB- The Si Intermetallic compound powder is heat treated process, wherein the heat treatment process is 800 ° C, the heat treatment time is 1 h; NB is prepared by the heat treatment process 5 Si 3 Intermetallic compound powder.

Embodiment 2

[0031] NB 5 Si 3 / SiC composite, according to quality percentage, including the following components:

[0032] In NB 5 Si 3 / SiC composite, with NB 5 Si 3 Intermetallic compounds are enhanced toughening phase, with SiC as matrix; where NB 5 Si 3 Intermetallic compound in NB 5 Si 3 The mass fraction in the / SiC composite is 35 wt;

[0033] The NB 5 Si 3 The intermetallic compound was prepared by mechanical alloying and heat treatment process; NB-Si intermetallic compound powder was prepared by mechanical alloying process ball milling 60h, wherein Nb: Si was 63:37; and the prepared NB- The Si Intermetallic compound powder is heat treated process, wherein the heat treatment process is 1000 ° C, the heat treatment time is 1 h; NB is prepared by the heat treatment process. 5 Si 3 Intermetallic compound powder.

Embodiment 3

[0035] NB 5 Si 3 / SiC composite, according to quality percentage, including the following components:

[0036] In NB 5 Si 3 / SiC composite, with NB 5 Si 3 Intermetallic compounds are enhanced toughening phase, with SiC as matrix; where NB 5 Si 3 Intermetallic compound in NB 5 Si 3 The mass fraction in the / SiC composite is 60 wt%.

[0037] The NB 5 Si 3 The intermetallic compound was prepared by mechanical alloying and heat treatment process; NB-Si intermetallic compound powder was prepared by mechanical alloying process ball milling 60h, wherein Nb: Si was 63:37; and the prepared NB- The Si Intermetallic compound powder is heat treated process, wherein the heat treatment process is 1200 ° C, the heat treatment time is 1 h; NB is prepared by the heat treatment process. 5 Si 3 Intermetallic compound powder.

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Abstract

An Nb5Si3 / SiC composite material comprises the following components that in the Nb5Si3 / SiC composite material, an Nb5Si3 intermetallic compound is used as a reinforcing and toughening phase, and SiC is used as a matrix, wherein the mass fraction of the Nb5Si3 intermetallic compound in the Nb5Si3 / SiC composite material is 10wt%-60wt%. A hot pressed sintering preparation method of the Nb5Si3 / SiC composite material comprises the steps that firstly, Nb-Si intermetallic compound powder is prepared through a mechanical alloying technology, wherein the molar ratio of Nb to Si is 63:37; Nb5Si3 intermetallic compound powder is prepared through a high-temperature heat treatment technology, wherein the ball-milling time of the mechanical alloying process is 60 hours, the heat treatment temperature is 800-1200 DEG C, and the heat preservation time is 1 hour, so that the Nb5Si3 intermetallic compound powder is prepared; the prepared Nb5Si3 intermetallic compound powder and SiC powder are mixed to prepare Nb5Si3 / SiC composite powder, the Nb5Si3 / SiC composite powder is subjected to a hot pressed sintering process, the hot pressed sintering temperature is 1600 DEG C, the pressure is 35 MPa, and the heat preservation time is 2 h; and an Nb5Si3 / SiC composite material block is prepared through the hot pressed sintering process, the Nb5Si3 / SiC composite material block prepared by the hot pressed sintering process has the advantages of high preparation efficiency and simple preparation process, the Nb5Si3 / SiC composite material product can be rapidly sintered and manufactured, and the Nb5Si3 / SiC composite material prepared by the hot pressed sintering process has high density and high mechanical properties.

Description

Technical field [0001] The present invention belongs to the technical field of composite materials, and specific to a NB 5 Si 3 Preparation method of SiC composites and its thermal pressure sintering. Background technique [0002] NB 5 Si 3 The intermetallic compound has high strength, high toughness, high melting point, high hardness and good wear resistance, and widely used in the engineering field with corrosion resistance and high temperature oxidation properties. And NB 5 Si 3 The intermetallic compound has good compatibility with the ceramic material, and the composite material can be prepared in combination with the ceramic material, which can be used as the enhancement and toughening phase of the ceramic material to improve the mechanical properties of the ceramic material and the anti-high temperature oxidation properties. Silicon carbide ceramic materials have high strength and higher hardness and have a wide range of applications with good abrasion resistance and high ...

Claims

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Application Information

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IPC IPC(8): C22C1/05B22F3/14C22C29/06C22C30/00C22C32/00
CPCC22C1/05B22F3/14C22C29/065C22C29/067C22C30/00C22C32/0063
Inventor 江涛
Owner XI'AN PETROLEUM UNIVERSITY
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