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Method for preparing dipping molybdenum alloy

A production method and molybdenum alloy technology, which is applied in the production field of molybdenum alloy doped with drawn filaments, can solve the problems that molybdenum alloy grains cannot grow thick and affect the deep processing of drawn filaments, etc.

Active Publication Date: 2009-02-18
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This liquid-liquid doping method can evenly distribute various rare earth elements in the molybdenum alloy, so that the overall performance of the molybdenum alloy product is significantly improved, but the crystal grains of the molybdenum alloy cannot grow thick, which seriously affects the deep processing of the drawn wire, making it difficult to enter certain Applications such as electric light source, CNC machine tool wire cutting processing and other industries are restricted

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  • Method for preparing dipping molybdenum alloy
  • Method for preparing dipping molybdenum alloy

Examples

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Effect test

Embodiment 1

[0015] Embodiment 1: prepare 1000Kg of ammonium molybdate according to the ratio of ammonium molybdate:ion water:ammonia=1Kg:0.55L:0.75L, heat and dissolve at 60 ℃~75 ℃ temperature, make ammonium paramolybdate solution, Control solution density to 1.40g / cm 3 ~1.41g / cm 3 , PH value is 6.0~6.3. The purity of 99.8%, La 2 O 3 4.8 kg of lanthanum nitrate with a content of not less than 37% is heated, dissolved and filtered at a solid-liquid ratio of 1:5. The prepared ammonium paramolybdate solution is evaporated and crystallized, and when the crystallization rate is about 75%, an aqueous solution of lanthanum nitrate is added, and the mixture is continued to be heated and stirred for 30 to 40 minutes until the mixture is uniform, and then the heating is stopped and cooled to room temperature. Ammonium Heteroparamolybdate. The doped ammonium paramolybdate is subjected to one-stage reduction at 400°C to 500°C and two-stage reduction at 850°C to 940°C in a hydrogen atmosphere to ...

Embodiment 2

[0016] Embodiment 2: prepare 1000Kg of ammonium molybdate according to the ratio of ammonium molybdate:ion water:ammonia=1Kg:0.58L:0.8L, heat and dissolve at 60 ℃~75 ℃ temperature, make ammonium paramolybdate solution, The density of the control solution is 1.42g / cm 3 ~1.43g / cm 3 , PH value is 6.5 to 6.8. 13 kg of yttrium nitrate with a purity of 99.5% was heated, dissolved and filtered at a solid-liquid ratio of 1:4 with ionized water. The obtained ammonium paramolybdate solution is evaporated and crystallized, and when the crystallization rate reaches about 78%, an aqueous solution of yttrium nitrate is added, and the mixture is continued to be heated and stirred for 30 to 40 minutes until the mixture is uniform, and then the heating is stopped and cooled to room temperature. Ammonium Heteroparamolybdate. Doped ammonium paramolybdate is subjected to one-stage reduction at 400°C to 500°C and two-stage reduction at 850°C to 940°C in a hydrogen atmosphere to prepare doped mo...

Embodiment 3

[0017] Example 3: Prepare 1000Kg of ammonium molybdate in the ratio of ammonium molybdate:ion water:ammonia=1Kg:0.55L:0.8L, heat and dissolve together at 60℃~75℃ to obtain ammonium paramolybdate solution , the control solution density is 1.43g / cm 3 ~1.45g / cm 3 , PH value is 7.2 to 7.5. Using ionized water, 5.6 kg of cerium nitrate with a purity of 99.5% was heated, dissolved and filtered at a solid-liquid ratio of 1:3.5. The obtained ammonium paramolybdate solution is evaporated and crystallized, and when the crystallization rate reaches about 75%, an aqueous solution of cerium nitrate is added, and the heating and stirring are continued for 30 to 40 minutes until the mixture is uniform, and then the heating is stopped and cooled to room temperature. Ammonium Heteroparamolybdate. The doped ammonium paramolybdate is subjected to one-stage reduction at 400°C to 500°C and two-stage reduction at 850°C to 940°C in a hydrogen atmosphere to prepare doped molybdenum powder with ytt...

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Abstract

The present invention provides a process for preparing doping molybdenum alloys through a liquor-liquor intermingle course. Said method comprises the following steps in sequences: preparing a para-molybdic acid ammonium solution proportionally and controlling the density and pH values of the solution, preparing aqueous solution of rare-earth metal salts, adding the aqueous solution of rare-earth metal salts into the para-molybdic acid ammonium solution when the evaporation crystallization yield of the para-molybdic acid ammonium solution achieves a centain value, deoxidizing the doping para-molybdic acid ammonium under hydrogen gas atmosphere to get molybdenum powder through two stages, pressing and high temperature sintering to prepare the desired molybdenum alloys.The present invention not only remarkably enhance all-round properties of molybdenum alloys by facilitating adequate distribution of rare-earth element, but also facilitates the realization of industrialisation mass production by overstriking the crystal particles of molybdenum alloys to satisfy the deep-processing requirement of doping filament drawing molybdenum strips.

Description

technical field [0001] The invention relates to a production method of doped molybdenum alloy, in particular to a production method of doped drawn wire molybdenum alloy. Background technique [0002] The application of pure molybdenum products is limited due to poor comprehensive mechanical properties and short service life. The preparation of doped molybdenum alloys by adding rare earth elements greatly improves the comprehensive properties of the products and has broad application prospects. Doping methods include: solid-solid doping, solid-liquid doping, and liquid-liquid doping. In order to ensure that the high temperature properties of molybdenum alloys are uniform in the working state, the uniform distribution of doping elements in molybdenum is extremely important, which is a prerequisite for the manufacture of uniform molybdenum materials. Comparing these three methods, the liquid-liquid doping method has the best effect of uniform distribution of doping elements; s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04B22F9/26B22F3/16
Inventor 李伯明曾建辉傅崇伟易晓明
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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