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Fine crystal rare earth oxide molybdenum alloy-doped and its preparation method

A technology of rare earth oxides and molybdenum alloys, which is applied in the field of fine-grained molybdenum alloy materials and their preparation, can solve the problems of unqualified quality of processed products and difficulties in deep processing of pure molybdenum materials, and achieve excellent mechanical properties, easy industrial production, and high yield big effect

Inactive Publication Date: 2006-04-12
山东铭特金属材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, molybdenum metal materials have the intrinsic characteristics of ductile-brittle transition and low-temperature brittleness inherent in body-centered cubic metals, so that the plasticity of pure molybdenum materials is reduced to brittleness at room temperature. This brittleness is difficult for deep processing of pure molybdenum materials and processed products. The essential reason for the poor quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 38.46 grams of lanthanum oxide and 2000 grams of molybdenum dioxide powder respectively, and dissolve 38.46 grams of lanthanum oxide in dilute nitric acid with a concentration of 5% by mass to prepare a lanthanum nitrate solution;

[0028] Add this lanthanum nitrate solution to 2000 grams of molybdenum dioxide powder by atomization method, wherein the mass percentage of lanthanum oxide is 2.5%, stir at room temperature to make it evenly doped, the stirring speed is 5rpm, and then bake at 120°C dry, the drying time is 1.5 hours;

[0029] The dried powder is roasted in a hydrogen protective atmosphere furnace, the roasting temperature is 500°C, and the time is 1h;

[0030] The roasted material is ball milled to pass through a 170-mesh sieve. The ball milling process is: powder: sphere = 3: 2 (mass ratio), and the time is 1 h. The sieved powder is subjected to multi-stage reduction treatment with hydrogen in the muffle furnace, the pressure of the hydrogen is 0.5Pa,...

Embodiment 2

[0033] Take by weighing 7.69 grams of cerium oxide and 2000 grams of molybdenum dioxide powder respectively, 7.69 grams of cerium oxide are dissolved in the dilute nitric acid that mass percentage concentration is 10%, prepare cerium nitrate solution, adopt this cerium nitrate solution to join 2000 gram of molybdenum dioxide powder, wherein the mass percentage of cerium oxide is 0.5%, stir at room temperature to make it evenly doped, the stirring speed is 10rpm, and then dry at 120°C for 1.5 hours. The final powder roasting, the roasting temperature is 650 ℃, and the time is 3h, and the material after drying is carried out ball milling and makes it pass through 170 mesh sieves, and ball milling process is: powder: spheroid=3: 2 (mass), and the time is 1h. The sieved powder is subjected to multi-stage reduction treatment with hydrogen in the muffle furnace, the pressure of the hydrogen is 0.5Pa, and the flow rate is 0.7m 3 / h, the specific reduction process is: 950°C×0.3h, 1100...

Embodiment 3

[0036] Weigh 3.02 grams of cerium oxide, 9.06 grams of yttrium oxide and 2000 grams of molybdenum dioxide powder respectively, and dissolve 3.02 grams of cerium oxide and 9.06 grams of yttrium oxide in dilute nitric acid with a concentration of 5% by mass to prepare cerium nitrate and yttrium nitrate mixed solution, the nitrate solution was added to 2000 grams of molybdenum dioxide powder by atomization method, wherein the mass percentage of cerium oxide was 0.2%, and the mass percentage of yttrium oxide was 0.6%, stirred at room temperature to make it doped evenly, and the stirring speed 5rpm, and then dried at 120°C for 1.5 hours. The dried powder was roasted at 600°C for 2h. The dried material was ball milled to pass through 170 mesh The sieve and ball milling process is: powder: sphere = 3: 2 (mass), and the time is 1h. The sieved powder is subjected to multi-stage reduction treatment with hydrogen in the muffle furnace, the pressure of the hydrogen is 0.3Pa, and the flow ...

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Abstract

A RE oxide doped fine-crystal Mo-alloy is prepared from MoO2 through doping RE oxide by atomizing method, ball grinding, sieving, reducing in H2 atmosphere in muffle furnace at 800-1100 deg.C, cold isostatic pressing under 150-200 MPa for shaping, segmental sintering in MF induction furnace and mechanical deforming to obtain rod or plate. It has high strength, ductility and toughness.

Description

technical field [0001] The invention relates to a rare earth oxide-doped molybdenum alloy material and a preparation method thereof, in particular to a fine-grained molybdenum alloy material and a preparation method thereof. Background technique [0002] Molybdenum metal has a high melting point (2620°C), high elastic modulus (320GPa~350GPa), high wear resistance, good electrical and thermal conductivity, and low expansion coefficient (5.03×10 -6 / K), and good acid and alkali resistance and liquid metal corrosion resistance, and the earth reserves are abundant. However, molybdenum metal materials have the intrinsic characteristics of ductile-brittle transition and low-temperature brittleness inherent in body-centered cubic metals, so that the plasticity of pure molybdenum materials is reduced to brittleness at room temperature. This brittleness is difficult for deep processing of pure molybdenum materials and processed products. The essential reason for the poor quality. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22F1/18B22F3/00B22F9/00
Inventor 孙军张国君孙院军丁向东刘刚江峰
Owner 山东铭特金属材料科技有限公司
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