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Preparation method of boride ceramic particle reinforced niobium-molybdenum-based composite

A technology of ceramic particles and composite materials, applied in the field of composite materials, which can solve the problems of sharp drop in temperature and strength

Active Publication Date: 2017-09-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to propose a composition and preparation method of a novel boride ceramic particle-reinforced niobium-molybdenum-based composite material, which solves the problem that the strength of niobium-based alloys and molybdenum-based alloys drops sharply at temperatures above 1100°C. It has high strength in the ultra-high temperature environment of ≤1800°C, and is a new type of ceramic particle reinforced refractory metal matrix composite material that can be used in the ultra-high temperature environment

Method used

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  • Preparation method of boride ceramic particle reinforced niobium-molybdenum-based composite

Examples

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Embodiment 1

[0033] Preparation of ZrB 2 Niobium-molybdenum matrix composites reinforced with boride ceramic particles with a mass fraction of 22%:

[0034] The alloy powder and ceramic powder were weighed, and boride ceramic particles reinforced niobium-molybdenum-based composites were prepared by using a vacuum high-frequency induction heating ultra-high temperature hot-pressing sintering furnace. The powder material is made of ZrB 2 , Nb, Mo and other components. Among the selected powders, ZrB 2 Powder (600 mesh, purity ≥99.95%): 22wt.%; Nb powder (500-800 mesh, purity ≥99.95%): 38wt.%; Mo powder (500-800 mesh, purity ≥99.95%): balance.

[0035] The specific steps are:

[0036] (1) Place the mixed powder in a prefabricated mold, and use a Y32-50T press to press the mixed powder into a green tire at room temperature; the pressure applied by the press to the mixed powder is 25 MPa;

[0037] (2) Put the pressed tire base into a dryer for drying, the drying temperature is 250°C, and t...

Embodiment 2

[0045] Preparation of ZrB 2 Niobium-molybdenum matrix composites reinforced with boride ceramic particles with a mass fraction of 35%:

[0046] The alloy powder and ceramic powder were weighed, and boride ceramic particles reinforced niobium-molybdenum-based composites were prepared by using a vacuum high-frequency induction heating ultra-high temperature hot-pressing sintering furnace. The powder material is made of ZrB 2 , Nb, Mo and other components. Among the selected powders, ZrB 2 Powder (600 mesh, purity ≥99.95%): 35wt.%, Nb powder (500-800 mesh, purity ≥99.95%): 32wt.%, Mo powder (500-800 mesh, purity ≥99.95%): balance.

[0047] The specific steps are:

[0048] (1) The mixed powder is placed in a prefabricated mold, and the mixed powder is pressed into a green tire at room temperature by using a Y32-50T press; the pressure applied by the press to the mixed powder is 28MPa;

[0049] (2) Put the pressed tire green into a dryer for drying, the drying temperature is 2...

Embodiment 3

[0057] Preparation of ZrB 2 Niobium-molybdenum matrix composites reinforced with boride ceramic particles with a mass fraction of 50%:

[0058] The alloy powder and ceramic powder were weighed, and boride ceramic particles reinforced niobium-molybdenum-based composites were prepared by using a vacuum high-frequency induction heating ultra-high temperature hot-pressing sintering furnace. The powder material is made of ZrB 2 , Nb, Mo and other components. Among the selected powders, ZrB 2 Powder (600 mesh, purity≥99.95%): 50wt.%, Nb powder (500-800 mesh, purity≥99.95%): 25wt.%, Mo powder (500-800 mesh, purity≥99.95%): balance.

[0059] The specific steps are:

[0060] (1) The mixed powder is placed in a prefabricated mold, and the mixed powder is pressed into a green tire at room temperature by using a Y32-50T press; the pressure applied by the press to the mixed powder is 30MPa;

[0061] (2) Put the pressed tire base into a dryer for drying, the drying temperature is 300°C...

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Abstract

The invention discloses a preparation method of a boride ceramic particle reinforced niobium-molybdenum-based composite. The preparation method of the boride ceramic particle reinforced niobium-molybdenum-based composite comprises the following steps of (1) preparing mixed powder, wherein the powder comprises 15 wt%-50 wt% of ZrB2, 25 wt%-51 wt% Nb and the balance Mo, the weight ratio of Nb powder and Mo powder is 1:1.5, and the powder is dried and mixed; and (2) conducting vacuum hot pressing sintering on the mixed powder, wherein vacuum hot pressing sintering specifically comprises the steps that firstly, the mixed powder is pressed into a green body; secondly, the green body is dried; thirdly, sintering is conducted in dynamic vacuum; fourthly, the highest sintering temperature reaches 2600 DEG C, and the temperature raising rate is 40-95 DEG C / min; fifthly, pressurizing is conducted on the mixed powder in the sintering process; sixthly, the temperature raising rate is adjusted to 40-50 DEG C / min after pressurizing, and the temperature and pressure in a furnace are raised; and seventhly, a press machine is switched off, a heating power source is turned off, natural slow cooling is conducted, the temperature of a sintering furnace is lowered to indoor temperature, and the temperature lowering rate is 10-50 DEG C / min.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a method for preparing boride ceramic particle-reinforced niobium-molybdenum-based composite materials by vacuum hot-pressing sintering. Background technique [0002] Particle-reinforced metal matrix composites are a class of high-performance advanced materials due to their excellent properties such as high specific stiffness, specific strength, specific modulus, wear resistance and high temperature resistance. [0003] Ceramic materials have the advantages of good corrosion resistance and wear resistance, but are relatively brittle and difficult to process; metal materials have excellent ductility, but poor wear resistance, corrosion resistance, and high temperature resistance. Particle-reinforced metal matrix composites take into account the high temperature resistance of ceramics and the good toughness of metals. They have excellent performance that can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/02C22C30/00C22C29/14C22C32/00C22C1/05B22F3/14
CPCB22F3/14B22F2999/00C22C1/05C22C1/051C22C27/02C22C29/14C22C30/00C22C32/0073B22F2201/20
Inventor 刘宗德王琦王永田
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)