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Metallurgy technological method for replacing W with Ti

A process method and alloy technology, which is applied in the field of metallurgical technology, can solve the problems of difficult removal, large alloy microporosity, low density, etc., and achieve good thermal processing performance, fine distribution, memory effect and excellent corrosion resistance.

Active Publication Date: 2015-04-15
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The NiTiW alloy was previously obtained by powder metallurgy. The NiTiW alloy prepared by powder technology uses Ni, W, and Ti metal powders. On the one hand, the purity of Ni, W, and Ti metal powders is lower than that of induction. The bulk metal material used in smelting, the high content of N, H, O and other gases in the material alloy, which makes the purity of the finally obtained NiTiW alloy low, there are more inclusions in the alloy, and the alloy has large microporosity and low density. ; On the other hand, due to the strong chemical activity of Ti, it is easy to combine with O to form TiO 2 , due to TiO 2 High chemical stability, once formed TiO 2 , it will be difficult to remove during the preparation of materials by powder metallurgy, resulting in very poor machinability of the alloy during cold and hot pressure processing; in addition, it is necessary to use high-temperature vacuum or H protection for a long time when powder metallurgy technology prepares NiTiW alloys Sintering, the production cost is high, and only NiTiW alloy with uniform composition can be obtained, but it cannot be very selective whether the composition of the alloy in the present invention is uniform or not, and the alloy has higher material density and purity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Ingredients and Weighing:

[0023]

W

Ni

Ti

Distribution point (wt%)

18

46

36

Loading position

Crucible bottom

above the W at the bottom

feeder

Added weight (g)

1728

4416

3456

[0024] Design feeding amount: 9.6kg

[0025] 1. Equipment parameters:

[0026] The melting power supply of the vacuum induction furnace should reach an effective output power of 95kW, the melting power frequency is 2000Hz, the inner diameter of the crucible is 130mm, and the depth of the molten pool is 88mm.

[0027] 2. Use the ingot mold:

[0028] A water-cooled copper ingot mold with a capacity of 9.6kg.

[0029] 3. Smelting:

[0030] Put all the W in the alloy into the bottom of the vacuum induction furnace crucible, then put all the Ni in the alloy into the crucible, put all the Ti in the vacuum induction furnace feeder, place the water-cooled copper ingot mold at a proper position in the vacuum chamber...

example 2

[0034] 1. Ingredients and weighing:

[0035]

W

Ni

Ti

Distribution point (wt%)

8

50

42

Loading position

Crucible bottom

above the W at the bottom

feeder

Added weight (g)

696

4250

3654

[0036] Design feeding amount: 8.7kg

[0037] 2. Equipment parameters:

[0038] The melting power supply of the vacuum induction furnace should reach an effective output power of 95kW, the melting power frequency is 2000Hz, the inner diameter of the crucible is 130mm, and the depth of the molten pool is 100mm.

[0039] 3. Use investment casting mold shell:

[0040] Investment casting shell baking temperature ≥ 750 ℃, holding time ≥ 1h.

[0041] 4. Smelting:

[0042]Put all the W in the alloy into the bottom of the vacuum induction furnace crucible, then put all the Ni in the alloy into the crucible, put all the Ti in the vacuum induction furnace feeder, and place the investment casting shell in a proper pos...

example 3

[0046] 1. Ingredients and weighing:

[0047]

NiW alloy prepared by powder metallurgy

Ti

Distribution point (wt%)

70 (W: 40%, Ni: 60% in NiW alloy)

30

Loading position

in the crucible

feeder

Added weight (g)

5600

2400

[0048] Design feeding amount: 8kg

[0049] 2. Equipment parameters:

[0050] The melting power supply of the vacuum induction furnace should reach an effective output power of 95kW, the melting power frequency is 2000Hz, the inner diameter of the crucible is 130mm, and the depth of the molten pool is 62mm.

[0051] 3. Smelting:

[0052] Put all the NiW alloy prepared by powder metallurgy into the crucible of the vacuum induction furnace, and put all the Ti in the feeder of the vacuum induction furnace. After closing the furnace cover, the vacuum chamber of the vacuum induction furnace is evacuated to 1.2Pa, and the W, Heating and melting Ni to melt Ni-W and adjusting the melting power at 2...

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PUM

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Abstract

The invention belongs to the technical field of metallurgy process, and relates to a metallurgy technological method for replacing W with Ti. W-Ti particles in NiTiW alloy prepared by using the method are finely distributed, and the NiTiW alloy has better hot working performance. When Ti is added, W in the Ni-W alloy is replaced and the W-Ti particles are formed; under combined action of density difference between Ni-Ti and W-Ti, cooling conditions and electromagnetic stirring, in one case, when the cooling condition is poor, for example, the alloy is cooled in a crucible, the alloy forms W-Ti particle sediment at bottom, thus, the sediment rich in W is formed at the bottom of the crucible; in other case, after the molten alloy is treated by strong electromagnetic stirring and injected into a copper ingot mould, since the cooling condition is good and the electromagnetic stirring is strong, the alloy forms dispersed W-Ti particles; when the cooling condition is between the two conditions, for example, the molten alloy is injected into a roasted invest shell after being stirred and forms W-Ti particles in graded distribution, the content of W-Ti on the upper part is low, and the content of W-Ti at the bottom is high.

Description

technical field [0001] The invention belongs to the technical field of metallurgical technology, and relates to a metallurgical technology method for substituting W with Ti. Background technique [0002] Ni-W alloy exists in the form of solid solution. After adding Ti to the molten Ni-W alloy, Ti and Ni form an intermetallic compound, and the excess Ti and W form W-Ti and are replaced. The alloy is used as an in-situ Composite material, W-Ti is distributed in NiTi matrix in the form of particles. [0003] The NiTiW alloy was previously obtained by powder metallurgy. The NiTiW alloy prepared by powder technology uses Ni, W, and Ti metal powders. On the one hand, the purity of Ni, W, and Ti metal powders is lower than that of induction. The bulk metal material used in smelting, the high content of N, H, O and other gases in the material alloy, which makes the purity of the finally obtained NiTiW alloy low, there are more inclusions in the alloy, and the alloy has large microp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22C14/00C22C30/00C22C1/02C22C1/03
Inventor 倪志铭韩劲王二敏官磊洪起虎杨根林
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS