Method of preparing high size precision profiled molybdenum parts

A technology for dimensional accuracy and parts, which is applied in the field of preparing special-shaped molybdenum parts with high dimensional accuracy, can solve the problems of high dimensional accuracy of molybdenum and the forming of parts with complex shapes, etc., so as to improve production efficiency and yield, uniform density, and reduce blanks The effect of body deformation risk

Inactive Publication Date: 2005-10-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing special-shaped molybdenum parts with high dimensional accuracy, which solves the high dimensional accuracy of molybdenum and the forming problems of complex shape parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix 60% paraffin wax, 25% high-density polyethylene, 10% polypropylene and 5% stearic acid evenly to prepare a binder. The volume ratio of molybdenum powder is 54%. Put molybdenum powder and binder in SK-160 After mixing on a type open rubber mixer, granulate on a PSJ32 mixing extruder to make the feeding more uniform. The feeding is injection molded on a CJ80-E injection machine with an injection temperature of 160°C and an injection pressure of 100MPa. The obtained injection body was extracted and degreased in trichlorethylene for 4 hours, then dried at 60°C for 30 minutes, and then placed in an atmosphere degreasing furnace for thermal degreasing. The thermal degreasing time was 8 hours. After pre-sintering for 1 hour in the medium frequency induction furnace, the sintering temperature is 2000 ° C, and the sintering time is 6 hours. The sintered products can be processed to obtain molybdenum parts.

Embodiment 2

[0019] Mix 55% paraffin wax, 25% high-density polyethylene, 15% polypropylene and 5% stearic acid to make a binder. The volume ratio of molybdenum powder is 54%. Put molybdenum powder and binder in SK- After mixing on the 160-type open rubber mixer, it is then granulated on the PSJ32 mixing extruder to make the feeding more uniform. The feeding is injection-molded on the CJ80-E injection machine, the injection temperature is 150 ° C, and the injection pressure is 120 MPa. , the obtained injection body was extracted and degreased in trichlorethylene for 2 hours, then dried at 60°C for 30 minutes, and then placed in an atmosphere degreasing furnace for thermal degreasing. The thermal degreasing time was 8 hours, and the degreasing body was heated in a hydrogen After pre-sintering in the furnace for 1 hour, place it in a medium-frequency induction furnace for sintering. The sintering temperature is 2100°C, and the sintering time is 3 hours. The sintered product will be processed t...

Embodiment 3

[0021] Mix 50% paraffin wax, 25% high-density polyethylene, 15% polypropylene and 10% stearic acid to make a binder. The volume ratio of molybdenum powder is 52%. Put molybdenum powder and binder in SK- After mixing on the 160-type open rubber mixer, granulate on the PSJ32 mixing extruder to make the feeding more uniform. The feeding is injection-molded on the CJ80-E injection machine, the injection temperature is 150 ° C, and the injection pressure is 100 MPa. , the obtained injection body was extracted and degreased in trichlorethylene for 4 hours, then dried at 60°C for 30 minutes, and then placed in an atmosphere degreasing furnace for thermal degreasing. The thermal degreasing time was 6 hours, and the degreasing body was heated in hydrogen After pre-sintering in the furnace for 1 hour, place it in a medium-frequency induction furnace for sintering. The sintering temperature is 2100°C, and the sintering time is 3 hours. The sintered product will be processed to obtain moly...

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Abstract

A process for preparing molybdenum part with high size precision and compactness includes preparing adhesive from paraffin wax, high-density polyethene, polypropene and stearic acid through proportionally mixing, mixing it with molybdenum powder, injection moulding, degreasing, presintering, sintering, holding the temp for 1-10 hr, and post treating.

Description

technical field [0001] The invention belongs to the technical field of injection molding, and in particular provides a method for preparing special-shaped molybdenum parts with high dimensional precision. Background technique [0002] As a rare refractory metal (melting point 2620°C), metal aluminum has a series of excellent properties such as high thermal conductivity, low thermal expansion coefficient, high elastic modulus and strength, making it an important material for modern defense, aerospace, and atomic energy industries. , high-performance electronic components and other widely used materials. For example, in the field of aviation, it can be used as throats, nozzles and valves of aircraft engines; in the electronics industry, it can be used as grid and anode support materials in electron tubes, thermionic cathode structural components of high-power microwave tubes, Substrates and heat sinks for transistors, silicon rectifiers, etc. [0003] The powder metallurgy m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10
Inventor 曲选辉秦明礼何新波段柏华罗铁钢
Owner UNIV OF SCI & TECH BEIJING
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