Method for preparing molybdenum and molybdenum alloys effuser by powder injection forming

A technology of molybdenum alloy and nozzle, which is applied in the field of preparing molybdenum or molybdenum alloy nozzle by powder metallurgy near-net forming technology, which can solve the problem of residual carbon or uneven distribution of carbon, absence of molybdenum or molybdenum alloy nozzle, and unfavorable alloy properties Influence and other problems, to achieve the effect of short process cycle, small size deviation and fine grain

Inactive Publication Date: 2008-09-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when powder injection molding is used to prepare molybdenum nozzles, due to the introduction of more binders with a volume content of 40% to 55%, it is easy to cause residual carbon or uneven distribution of carbon during thermal degreasing, and residual Carbon or uneven distribution of carbon can adversely affect the properties of the alloy
[0004] At present, there are relatively few studies on the injection molding technology of molybdenum alloys at home and abroad, coupled with the special shape requirements of the nozzle, so there is no literature on the preparation of molybdenum or molybdenum alloy nozzles by powder injection molding technology

Method used

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  • Method for preparing molybdenum and molybdenum alloys effuser by powder injection forming
  • Method for preparing molybdenum and molybdenum alloys effuser by powder injection forming

Examples

Experimental program
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Effect test

example 1

[0020] (1) Weigh the mass of each binder component according to the mass percentage ratio (take 100g binder as an example):

[0021]

[0022] Mix each component on the internal mixer to form a uniform color mixture, which is the binder used;

[0023] (2) Take by weighing 3000g molybdenum powder and 234g binding agent according to powder volume loading (such as 55%), powder and binding agent are mixed 2.5h in internal mixer, prepare the feeding material of mixing;

[0024] (3) Inject the feed material on the injection machine to produce the nozzle injection base;

[0025] (4) Solvent degreasing the injection base in solvent gasoline, and the degreasing time is 30h;

[0026] (5) The solvent degreasing base is carried out degreasing pre-burning in the degreasing furnace, and the degreasing atmosphere adopts H 2 Protection, the process is: from room temperature to 350°C at 1°C / min (120min hold), then to 450°C at 2°C / min (120min hold), and finally to 1000°C at 2°C / min (90min h...

Embodiment 2

[0030] (1) Weigh the mass of each binder component according to the mass percentage ratio (take 100g binder as an example):

[0031]

[0032] Mix each component on the internal mixer to form a uniform color mixture, which is the binder used;

[0033] (2) Weigh 3000g molybdenum alloy powder (Mo-0.5%Ti) and 266g binder according to powder volume loading, mix powder and binder in internal mixer for 1.5h, and prepare uniformly mixed feed ;

[0034] (3) Inject the feed material on the injection machine to produce the nozzle injection base;

[0035] (4) Solvent degreasing the injection base in solvent gasoline, and the degreasing time is 40h;

[0036] (5) The solvent degreasing base is carried out degreasing pre-burning in the degreasing furnace, and the degreasing atmosphere adopts H 2 Protection, the process is: from room temperature to 300°C at 2°C / min (180min hold), then to 450°C at 1°C / min (120min hold), and finally to 900°C at 2°C / min (120min hold );

[0037] (6) Sinte...

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Abstract

A molybdenum or molybdenum alloy nozzle with very complicated shape is manufactured by powder injection molding. The molybdenum or molybdenum alloy nozzle is prepared by the following steps: mixing molybdenum or molybdenum alloy powder with a multi-component bonding agent consisting of paraffin wax, oil, low-molecule coupling agent and polymer to obtain uniform feeding material, injecting the feeding material on an injecting machine to obtain the injected blank of molybdenum or molybdenum alloy nozzle, degreasing solvent of the injected blank at a degreasing rate between 50% to 65%, pre-heating the solvent degreasing blank in a hot degreasing furnace, and high-temperature sintering the sample after hot degreasing pre-heating to obtain the molybdenum or molybdenum alloy nozzle with no deformation and stable performance.

Description

Technical field: [0001] The invention relates to the field of powder metallurgy, in particular to a method for preparing molybdenum or molybdenum alloy nozzles by adopting powder metallurgy near net shape technology. Background technique: [0002] Molybdenum is an important metal material, which has high melting point, low thermal expansion coefficient, low vapor pressure, high wear resistance, high thermal conductivity, high high temperature strength, good electrical conductivity and excellent compatibility with molten metals, so It has a wide range of applications in aviation, aerospace and high temperature structural parts and other fields. Nozzle is an important part of weaponry and aero-engine, which has a great influence on its performance. Molybdenum and molybdenum alloys have become an important nozzle material due to its series of excellent properties. [0003] At present, the method for preparing molybdenum nozzles is mainly to prepare molybdenum slabs by casting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/00
Inventor 范景莲成会朝黄伯云田家敏刘涛卢明园
Owner CENT SOUTH UNIV
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