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A kind of mo-si-b alloy doped with rare earth oxide and preparation method thereof

A rare earth oxide, mo-si-b technology, applied in the field of powder metallurgy, can solve the problems of fineness, fracture toughness cannot meet the needs of application promotion of Mo-Si-B alloy, small grain size span, etc., and achieves the preparation process. Simple, good strength and fracture toughness, low equipment requirements

Active Publication Date: 2020-03-31
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the overall grain size of α-Mo in the existing Mo-Si-B alloy doped with rare earth oxides shows that the grains are relatively small, and the scale span of the grains is small, so that the existing doped rare earth oxides However, the fracture toughness of Mo-Si-B alloys still cannot meet the needs of the application and popularization of Mo-Si-B alloys.

Method used

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  • A kind of mo-si-b alloy doped with rare earth oxide and preparation method thereof
  • A kind of mo-si-b alloy doped with rare earth oxide and preparation method thereof
  • A kind of mo-si-b alloy doped with rare earth oxide and preparation method thereof

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preparation example Construction

[0037] A method for preparing rare earth oxide-doped Mo-Si-B alloy mainly includes the following steps:

[0038] Step 1. Weigh the raw materials. According to the mass fraction, weigh 4.5%-9.5% of molybdenum powder, 4.0%-5.0% of silicon powder, 1.0%-2.0% of boron powder, and the rest are prepared by liquid-liquid doping technology with 0.3% -1.5wt% molybdenum alloy powder of rare earth oxide particles, the sum of the above components is 100%.

[0039] Step 2. Put the molybdenum alloy powder, silicon powder and boron powder weighed in step 1 into a planetary ball mill and mix for 6h-10h to obtain a mixed powder; the ball mill jar and ball used in the ball mill are made of agate. The material ratio is 1:1-3:1, the speed of the ball mill is 200r / min-400r / min, and the Ar gas atmosphere is introduced during the ball milling process, and the gas pressure in the ball mill tank is 0.3MPa-0.6MPa;

[0040] After the ball milling and mixing are completed, mechanical alloying treatment is carri...

Embodiment 1

[0050] A method for preparing rare earth oxide-doped Mo-Si-B alloy mainly includes the following steps:

[0051] Step 1. Weigh the raw materials and weigh the 0.3wt% La prepared by liquid-liquid doping technology 2 O 3 200g of molybdenum alloy powder, 10.5g of molybdenum powder with a purity of not less than 99.995% by weight, 9.27g of silicon powder with a purity of not less than 99.995% by weight, and 2.53g of boron powder with a purity of not less than 99.95% by weight.

[0052] Step 2. Put the molybdenum alloy powder, silicon powder and boron powder weighed in step 1 into a planetary ball mill and mix for 6 hours to obtain a mixed powder; the ball mill jar and ball used in the ball mill are made of agate, and the ratio of ball to material is 1:1, the speed of the ball mill is 200r / min, and the Ar gas atmosphere is introduced during the ball milling process, and the gas pressure in the ball mill tank is 0.3MPa;

[0053] After the ball milling and mixing are completed, mechanical a...

Embodiment 2

[0065] A method for preparing rare earth oxide-doped Mo-Si-B alloy mainly includes the following steps:

[0066] Step 1. Weigh the raw materials, weigh 1.5wt% CeO prepared by liquid-liquid doping technology 2 200g of molybdenum alloy powder, 9.94g of molybdenum powder with a purity of not less than 99.995% by weight, 8.84g of silicon powder with a purity of not less than 99.995% by weight, and 2.2g of boron powder with a purity of not less than 99.95% by weight.

[0067] Step 2. Put the molybdenum alloy powder, silicon powder and boron powder weighed in step 1 into a planetary ball mill, and mix for 10 hours to obtain a mixed powder; the ball mill jar and ball used in the ball mill are made of agate, and the ratio of ball to material is It is 3:1, the speed of the ball mill is 400r / min, and the Ar gas atmosphere is introduced during the ball milling, and the gas pressure in the ball mill tank is 0.6MPa;

[0068] After the ball milling and mixing are completed, mechanical alloying tre...

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Abstract

The invention particularly relates to a rare-earth-oxide-doped Mo-Si-B alloy. The alloy is prepared from alpha-Mo, Mo3Si, Mo5SiB2 and rare-earth oxide; alpha-Mo grains include 10%-25% of micron-scalealpha-Mo grains, 60%-70% of submicron-scale alpha-Mo grains and 5%-30% of nano-scale alpha-Mo grains; the micron-scale alpha-Mo grains are distributed in the submicron-scale alpha-Mo grains or the nano-scale alpha-Mo grains; Mo3Si grains and Mo5SiB2 grains are in the submicron scale and are distributed in the alpha-Mo grains; the rare-earth oxide includes 10%-30% of submicron-scale rare-earth oxide and 70%-90% of nano-scale rare-earth oxide; and rare-earth oxide particles are distributed in the grains and grain boundaries of alpha-Mo, Mo3Si and Mo5SiB2. The invention further relates to a preparation method of the rare-earth-oxide-doped Mo-Si-B alloy. The method comprises steps including weighing of raw materials, ball-milling mixing, mechanical alloying, high-energy ball milling, re-ball-milling mixing, sintering and the like. The Mo-Si-B alloy has the more excellent strength and fracture toughness. According to the preparation method of the rare-earth-oxide-doped Mo-Si-B alloy, the equipment requirements are low, the preparation technology is simple, the cost is low, and industrial production is easy to realize.

Description

Technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a Mo-Si-B alloy doped with rare earth oxides and a preparation method thereof. Background technique [0002] Molybdenum-based alloy has the characteristics of high melting point, corrosion resistance, good thermal conductivity, low thermal expansion coefficient and chemical stability. It is an excellent high temperature resistant material, which can meet the high temperature resistance of materials in the fields of aviation, aerospace, automobile and aircraft. Performance requirements. In particular, Mo-Si-B alloy is expected to become the next generation of widely used high temperature structural materials due to its excellent creep resistance and oxidation resistance. [0003] Mo-Si-B alloy mainly refers to Mo 5 Si 3 , Mo 5 SiB 2 And Mo 3 Si three-phase Mo-Si-B alloy or α-Mo, Mo 3 Si and Mo 5 SiB 2 Three-phase Mo-Si-B alloy. But Mo 5 Si 3 , Mo 5 SiB 2 And Mo 3 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C1/05C22C1/10
CPCC22C1/05C22C27/04
Inventor 张国君李瑞陈璇王娟
Owner XIAN UNIV OF TECH