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A kind of preparation method of molybdenum-chromium-zirconium boride composite material

A composite material, a technology of zirconium boride, is applied in the field of preparation of molybdenum-chromium-zirconium boride composite materials, which can solve the problems affecting the mechanical properties of transition metal boride ceramic materials, unable to meet the requirements of use, and the growth of ceramic materials grains, etc. problems, to achieve the effect of improving fracture toughness at room temperature, good matching, and reducing sintering temperature

Inactive Publication Date: 2015-09-30
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this process is that it will lead to abnormal growth of the internal grains of the ceramic material, causing internal stress and micro-cracks, which seriously affect the mechanical properties of transition metal boride ceramic materials.
On the other hand, a single zirconium boride ceramic material has low room temperature fracture toughness and cannot meet the requirements of use.

Method used

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  • A kind of preparation method of molybdenum-chromium-zirconium boride composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of the present embodiment molybdenum-chromium-zirconium boride composite material comprises the following steps:

[0022] Step 1, place the mixed powder of molybdenum powder, chromium powder and zirconium boride powder and dehydrated alcohol in the planetary ball mill at a volume ratio of 1:1, the rotating speed of the ball mill is 400rpm, and the ball-to-material ratio is 5:1. Lower the ball mill and mix for 20 hours to obtain a slurry; the mass percentages of molybdenum powder, chromium powder and zirconium boride powder in the mixed powder are respectively: 58% of molybdenum powder, 4% of chromium powder, and 38% of zirconium boride powder; The particle size of the zirconium powder is not greater than 5 μm, and the mass purity is not less than 98%. The particle size of the chromium powder is not greater than 5 μm, and the mass purity is not less than 99%. 99%;

[0023] Step 2, drying the slurry described in step 1 under vacuum conditions at a ...

Embodiment 2

[0027] The preparation method of the present embodiment molybdenum-chromium-zirconium boride composite material comprises the following steps:

[0028] Step 1, place the mixed powder of molybdenum powder, chromium powder and zirconium boride powder and dehydrated alcohol in the planetary ball mill at a volume ratio of 1:1, the rotating speed of the ball mill is 400rpm, and the ball-to-material ratio is 5:1. Lower the ball mill and mix for 20 hours to obtain a slurry; the mass percentages of molybdenum powder, chromium powder and zirconium boride powder in the mixed powder are respectively: 86% of molybdenum powder, 8% of chromium powder, and 6% of zirconium boride powder; The particle size of the zirconium powder is not greater than 5 μm, and the mass purity is not less than 98%. The particle size of the chromium powder is not greater than 5 μm, and the mass purity is not less than 99%. 99%;

[0029] Step 2, drying the slurry described in step 1 under vacuum conditions at a t...

Embodiment 3

[0033] The preparation method of the present embodiment molybdenum-chromium-zirconium boride composite material comprises the following steps:

[0034] Step 1, place the mixed powder of molybdenum powder, chromium powder and zirconium boride powder and dehydrated alcohol in the planetary ball mill at a volume ratio of 1:1, the rotating speed of the ball mill is 400rpm, and the ball-to-material ratio is 5:1. Lower the ball mill and mix for 20 hours to obtain a slurry; the mass percentages of molybdenum powder, chromium powder and zirconium boride powder in the mixed powder are respectively: 52% of molybdenum powder, 1% of chromium powder, and 47% of zirconium boride powder; The particle size of the zirconium powder is not greater than 5 μm, and the mass purity is not less than 98%. The particle size of the chromium powder is not greater than 5 μm, and the mass purity is not less than 99%. 99%;

[0035] Step 2, drying the slurry described in step 1 under vacuum conditions at a ...

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Abstract

The invention provides a method for preparing a molybdenum-chromium-zirconium boride composite material. The method comprises the following steps: 1, performing ball milling on mixed powder of molybdenum powder, chromium powder and zirconium boride powder and absolute ethyl alcohol in a ball mill according to a ratio, thereby obtaining slurry; 2, drying the slurry under vacuum conditions, grinding the dried slurry, and obtaining a blank; and 3, performing hot-pressing and sintering on the blank, thereby obtaining the molybdenum-chromium-zirconium boride composite material. Chromium is introduced into a complex system of molybdenum and zirconium boride, the room temperature breaking tenacity of the composite material can be improved, the sintering temperature is reduced, the sintering temperature of the composite material can be further reduced due to mechanical alloying, and separation between a ceramic phase and metals is avoided. The room temperature breaking tenacity and high-temperature tensile strength of the molybdenum-chromium-zirconium boride composite material prepared by the method can be well matched.

Description

technical field [0001] The invention belongs to the technical field of cermet composite materials, and in particular relates to a preparation method of a molybdenum-chromium-zirconium boride composite material. Background technique [0002] With the continuous development of aerospace technology, hypersonic weapons with hypersonic speed, high maneuverability and long-distance precision strike as the main technical features have become a military hotspot in the world, and will bring a revolution to the concept and mode of future warfare. Long-term service characteristics pose a severe challenge to the heat-resistant materials of weapons and equipment, especially the strict requirements on the temperature resistance limit and durability of anti-oxidation materials, high-temperature oxidation and light-weight strengthening and toughening performance under complex load conditions . Therefore, new materials with higher strength and toughness must be explored. [0003] Zirconium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10C22C27/04C22C32/00
Inventor 喻吉良张如郑欣李来平夏明星白润刘辉
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH