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Method for preparing molybdenum-silicium-boron alloy

A boron alloy and alloy powder technology, applied in the field of preparation of molybdenum-silicon-boron alloy, can solve the problems of high oxygen content and other impurities, high cost, complicated operation and the like

Inactive Publication Date: 2009-04-01
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

Although this method has the advantages of stable process and uniform composition, the method has disadvantages such as long time, complicated operation, and high cost. Generally, this preparation method requires a long time for homogenization to obtain the required molybdenum-silicon-boron alloy material. In addition, the silicon-based intermetallic compound powder obtained by this method often has high oxygen content and other impurities, which affects the engineering application of the material. These problems have become key issues restricting the development and application of molybdenum-silicon-boron alloys one

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Weigh 85.2g molybdenum powder, 12.6g silicon powder and 2.2g boron powder respectively, and use a blender for uniform mixing treatment, and smelt in an arc melting furnace with a smelting working current of 700A. The smelted block The body is crushed and annealed. The annealing temperature is: 1200℃, and the time is: 1.0 hour. Then the annealed alloy powder is put into a graphite mold, and the mold is sintered in a spark plasma sintering furnace. Argon is used for sintering. Protected by gas atmosphere, the heating rate is 300℃ / min, the sintering temperature is: 1450℃, the sintering axial pressure is: 25MPa, the sintering holding time: 3min, after sintering, the mold is taken out after the furnace is cooled to 450℃, and cooled to At room temperature, after demolding, the obtained sintered body is processed to remove the surface layer by 0.3 mm, and the molybdenum-silicon-boron alloy material is obtained.

Embodiment 2

[0014] Example 2: Weigh 86.1g of molybdenum powder, 11.5g of silicon powder and 2.4g of boron powder, and use a blender for uniform mixing, and then smelt in an electric arc smelting furnace. The smelting current is 750A. The smelted block The body is crushed and annealed, the annealing temperature is: 1250℃, the time is: 1.0 hour, and then the annealed alloy powder is put into a graphite mold, and the mold is sintered in a spark plasma sintering furnace. Argon is used for sintering. Protected by gas atmosphere, the heating rate is 400℃ / min, the sintering temperature is: 1400℃, the sintering axial pressure is: 28MPa, the sintering holding time: 5min, after sintering, the mold is taken out after the furnace is cooled to 400℃, and cooled to At room temperature, after demolding, the obtained sintered body is processed to remove the surface layer by 0.3 mm, to obtain a molybdenum-silicon-boron alloy material.

Embodiment 3

[0015] Example 3: Weigh 87.5g molybdenum powder, 11.2g silicon powder and 1.3g boron powder respectively, use a blender for uniform mixing treatment, and smelt in an arc melting furnace with a smelting working current of 800A. The smelted block The body is crushed and annealed, the annealing temperature is: 1300℃, the time is: 1.0 hour, and then the annealed alloy powder is put into a graphite mold, and the mold is sintered in a spark plasma sintering furnace. Argon is used for sintering. Protected by gas atmosphere, the heating rate is 350℃ / min, the sintering temperature is: 1550℃, the sintering axial pressure is: 28MPa, and the sintering holding time: 3min. After sintering, the mold is taken out after the furnace is cooled to 400℃ and cooled to At room temperature, after demolding, the obtained sintered body is processed to remove the surface layer of 0.4 mm to obtain a molybdenum-silicon-boron alloy material.

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Abstract

The invention discloses a method for preparing molybdenum-silicon-boron alloy, which comprises the steps that: molybdenum powder, silicon powder and boron powder are taken as raw materials; after even mixed treatment, the alloy powder is subjected to smelting in an arc-melting furnace, a smelting operating current is 700A to 800A; a lump after smelting is subjected to crushing and annealing treatment, the annealing temperature is 1200 DEG C to 1300 DEG C, the time is 0.5 hour to 1.5 hours; and then the alloy powder after the annealing treatment is put in an electricity-discharging plasma sintering furnace for sintering, the sintering temperature is 1400 DEG C to 1600 DEG C, the sintering time is 2min to 5min and the sintering pressure is 10MPa to 30MPa. The molybdenum-silicon-boron alloy prepared by the method has the advantages of simple method and fast speed, and has high organization compaction, strength and extensibility.

Description

Technical field [0001] The invention belongs to the technical field of powder metallurgy, and particularly relates to a method for preparing a molybdenum-silicon-boron alloy. Background technique [0002] In recent years, with the rapid development of the aerospace and defense industries, higher and more stringent requirements have been placed on the high-temperature mechanics and oxidation resistance of high-temperature structural materials. However, the currently widely used nickel-based superalloys and other high-temperature alloys are due to their own The limitation (the maximum service temperature cannot exceed 1100°C) has become a bottleneck restricting the development of related industrial fields. Therefore, scientists from various countries have accelerated the research progress of the next generation of high-temperature structural materials. The current research results show that the molybdenum-silicon-boron alloy has the most potential to replace nickel-based superalloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C27/04
Inventor 孙军张国君杨双平孙院军江峰刘刚
Owner 山东铭特金属材料科技有限公司
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