CN1071969A - Ni-mo-rare-earth alloy boat for reduction of w-mo powder - Google Patents
Ni-mo-rare-earth alloy boat for reduction of w-mo powder Download PDFInfo
- Publication number
- CN1071969A CN1071969A CN 92114672 CN92114672A CN1071969A CN 1071969 A CN1071969 A CN 1071969A CN 92114672 CN92114672 CN 92114672 CN 92114672 A CN92114672 A CN 92114672A CN 1071969 A CN1071969 A CN 1071969A
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- alloy
- boat
- powder
- reduction
- nickel
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Abstract
The invention discloses a kind of method that is suitable for the chemical ingredients of the nickel molybdenum rare earth alloy of working in the W-Mo powder reduction hydrogen environment and makes the W-Mo powder boat for reduction of W with this alloy.The chemical ingredients of alloy is: (16-32) % molybdenum, and (0.05-0.15) % cerium, surplus is nickel.Adopt the alloy of this composition, melting under the nitrogen protection in power frequency or medium-frequency induction furnace is the full form casting process of system shell binding agent with the tetraethyl silicate, can produce Ni-Mo-rare-earth alloy boat for reduction of W-Mo powder.
Description
The present invention relates to a kind of neoteric nickel molybdenum rare earth alloy and this alloy and make the method for W-Mo powder boat for reduction of W with investment casting method.
Adopting tube furnace hydrogen reducing tungstic oxide to produce in the tungsten powder process, anhydrous wolframic acid powder places boat to push tube furnace from boiler tube one end by pushing away boat mechanism, and top temperature is about 950 ℃ in the stove.Hydrogen air inlet dew point is lower than-40 ℃.For guaranteeing tungsten powder purity, boat must not have the oxide skin pollution tungsten powder that comes off, simultaneously, boat must have the distortion that enough hot strength opposings are caused by thermal stresses and mechanical force, to reduce to push away the boat resistance, avoid boat in boiler tube, to topple, be beneficial to that tungsten powder after the reduction is poured out and the packing into of anhydrous wolframic acid powder, and require boat to have long as far as possible work-ing life.
At present, generally to adopt pure nickel, nickel chromium triangle be that superalloy or stainless material welding are made to the boat of tungsten powder reduction both at home and abroad.The surface can form the oxide film of one deck and the firm difficult drop-off of matrix bond during nickel system boat used.But nickel boat hot strength is low, in that to push away under boat power and the thermal stresses effect distortion serious, and very easily adheres to tungsten powder; The nickel chromium high-temperature alloy boat has higher high temperature strength and non-deformability.But nichrome should not be worked under the reductibility environment.In 950 ℃ of hydrogen reducing tube furnaces, the nickel chromium high-temperature alloy boat has the oxide skin pollution tungsten powder that comes off, and has spot corrosion to take place, and local perforations can appear in severe patient.Also there is the nichrome similar problem in heat-resistance stainless steel, and oxidation and spot corrosion are more serious, and hot strength also is lower than nichrome.
The purpose of this invention is to provide a kind of alloy of new Chemical Composition and make the method for W-Mo powder boat for reduction of W with this alloy.This alloy has higher high temperature strength, boat non-scale under the tungsten powder reductive condition with its manufacturing peels off, pushing away under boat mechanical force and the thermal stresses effect indeformablely, and having castability preferably, available investment casting method manufacturing is suitable for the boat of W-Mo powder reduction usefulness.
Task of the present invention reaches like this: the Chemical Composition of alloy is (weight percent): (16-32) % molybdenum, and (0.05-0.15) % cerium, surplus is nickel.Adopting this alloy ingredient, with power frequency or medium-frequency induction furnace nitrogen protection melting, is system shell binding agent with the tetraethyl silicate, makes boat with investment casting method.
The particular content of invention is provided by following examples:
The Chemical Composition of alloy is (weight percent): 21.0% molybdenum, and 0.08% cerium, surplus is nickel.The melting of medium-frequency induction furnace nitrogen dynamic protection, tetraethyl silicate is the full form casting process of system shell binding agent, produces long 250mm, wide 50mm, high 42mm, wall thickness 3.5mm, the curving of castings is the nickel molybdenum rare earth alloy tungsten powder boat for reduction of W of 5mm.This boat is worked in 950 ℃ 13 pipe furnaces after four and half, and non-scale generates, and still keeps silvery white metalluster, does not have distortion, and the boat inwall does not almost have sticking powder, and charging and discharging are easy, the tungsten powder steady quality.Compare with adopting nickel and superalloy welding boat, the boat production cost reduces, and prolong work-ing life, and the tungsten powder quality improves, and tube furnace productivity improves.After boat damages, still recyclable casting again.
During the present invention also is applicable to that molybdenum powder reduction is produced.
Claims (2)
1, a kind of alloy of working in the hydrogen environment that is applicable to, its Chemical Composition is (weight percent): (16-32) % molybdenum, (0.05-0.15) % cerium, surplus is the nickel molybdenum rare earth alloy of nickel.
2, pressing the alloy ingredient of claim (1) defined, adopt power frequency or medium-frequency induction furnace nitrogen protection melting, is the full form casting process of system shell binding agent with the tetraethyl silicate, makes the method for W-Mo powder reduction with nickel molybdenum rare earth alloy boat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92114672 CN1071969A (en) | 1992-12-29 | 1992-12-29 | Ni-mo-rare-earth alloy boat for reduction of w-mo powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92114672 CN1071969A (en) | 1992-12-29 | 1992-12-29 | Ni-mo-rare-earth alloy boat for reduction of w-mo powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1071969A true CN1071969A (en) | 1993-05-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92114672 Pending CN1071969A (en) | 1992-12-29 | 1992-12-29 | Ni-mo-rare-earth alloy boat for reduction of w-mo powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1071969A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100579692C (en) * | 2007-12-27 | 2010-01-13 | 南京航空航天大学 | Reduction preparation method of electronic grade high pure molybdenum powder |
-
1992
- 1992-12-29 CN CN 92114672 patent/CN1071969A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100579692C (en) * | 2007-12-27 | 2010-01-13 | 南京航空航天大学 | Reduction preparation method of electronic grade high pure molybdenum powder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |