Method for preparing tungsten alloys with different components through same-furnace sintering

A technology of tungsten alloy and high tungsten, applied in the field of sintering preparation of tungsten alloys with different compositions in the same furnace, can solve the problems of long sintering production cycle, low sintering production efficiency, long sintering conversion time, etc. The effect of enhancing sintering activation performance and improving sintering resistance

Active Publication Date: 2021-03-09
XIAN HUASHAN TUNGSTEN PROD CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Due to the different sintering temperature and sintering holding time of tungsten alloys with different components, when sintering tungsten alloys with different components in a continuous molybdenum wire sintering furnace or a hydrogen-passing furnace, it is necessary to adjust the sintering temperature and holding time after the tungsten alloy of one component is released from the furnace (boat pushing speed ) to sinter the tungsten alloy of the next composition. The molybdenum wire sintering furnace needs at least 6 hours from feeding to discharging, and the sintering time of each furnace in the hydrogen furnace is between 18-24h. The sintering conversion time is long, which leads to the production cycle of tungsten alloy sintering Long, low sintering production efficiency restricts sintering capacity, and causes waste of energy during sintering conversion

Method used

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  • Method for preparing tungsten alloys with different components through same-furnace sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment includes the following steps:

[0026] Step 1. Select fine tungsten powder with a particle size of 3.0 μm, ultrafine iron powder with a particle size of 4.3 μm, fine-grained nickel powder with a particle size of 2.8 μm and cobalt powder with a particle size of 1.5 μm and add them to the mixer and mix to obtain activation High tungsten mixture; the mass content of fine tungsten powder in the described activated high tungsten mixture is 93%, the mass content of nickel powder is 4%, the mass content of superfine iron powder is 1%, and the mass content of cobalt powder is 2% %;

[0027] Step 2. Select coarse tungsten powder with a particle size of 6.0 μm, iron powder with a particle size of 8.0 μm and nickel powder with a particle size of 3.6 μm and add them to the mixer to obtain a passivated low-tungsten mixture; the passivated low-tungsten mixture The mass content of coarse tungsten powder in the mixture is 90%, the mass content of nickel powder is 7%, a...

Embodiment 2

[0031] This embodiment includes the following steps:

[0032] Step 1. Select fine tungsten powder with a particle size of 2.8 μm, fine nickel powder with a particle size of 2.5 μm, ultra-fine iron powder with a particle size of 4.0 μm and cobalt powder with a particle size of 1.2 μm and add them to the mixer and mix to obtain a highly activated Tungsten mixture; the mass content of fine tungsten powder in the described activated high-tungsten mixture is 95%, the mass content of fine nickel powder is 3.56%, the mass content of ultrafine iron powder is 1.19%, and the mass content of cobalt powder is 0.25% %;

[0033]Step 2. Select coarse tungsten powder with a particle size of 5.5 μm, nickel powder with a particle size of 3.2 μm and iron powder with a particle size of 7.0 μm and add them to the mixer to obtain a passivated low-tungsten mixture; the passivated low-tungsten mixture is The mass content of coarse tungsten powder in the mixture is 93%, the mass content of nickel pow...

Embodiment 3

[0037] This embodiment includes the following steps:

[0038] Step 1. Select fine tungsten powder with a particle size of 2.5 μm, fine nickel powder with a particle size of 2.2 μm, ultra-fine iron powder with a particle size of 3.3 μm and cobalt powder with a particle size of 0.9 μm and add them to the mixer and mix to obtain a highly activated Tungsten mixture; the mass content of fine tungsten powder in the activated high-tungsten mixture is 97%, the mass content of fine nickel powder is 2.16%, the mass content of ultrafine iron powder is 0.54%, and the mass content of cobalt powder is 0.3% %;

[0039] Step 2: select coarse tungsten powder with a particle size of 5.0 μm, nickel powder with a particle size of 3.0 μm and iron powder with a particle size of 6.6 μm and add them to the mixer to obtain a passivated low-tungsten mixture; the passivated low-tungsten mixture The mass content of coarse tungsten powder in the mixture is 95%, the mass content of nickel powder is 3.5%, ...

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Abstract

The invention discloses a method for preparing tungsten alloys with different components through same-furnace sintering. The method comprises the following steps of: 1, selecting fine tungsten powderand fine nickel powder, adding ultrafine iron powder, and carrying out mixing to obtain an activated high-tungsten mixture; 2, selecting coarse tungsten powder and nickel powder, adding iron powder, and carrying out mixing to obtain a passivated low-tungsten mixture; 3, obtaining an activated high-tungsten compact and a passivated low-tungsten compact by adopting cold isostatic pressing forming separately; and 4, carrying out same-furnace sintering on the activated high-tungsten compact and the passivated low-tungsten compact to obtain a high-tungsten alloy and a low-tungsten alloy separately.By selecting and designing the raw material components and contents of the high-tungsten alloy and the low-tungsten alloy, the sintering temperature of the activated high-tungsten mixture is reduced,and the sintering temperature of the passivated low-tungsten mixture is increased, so that the sintering temperature and the heat preservation time of the high-tungsten alloy and the low-tungsten alloy tend to be the same, the purpose of same-furnace sintering is achieved, the sintering periods of the tungsten alloys with different components are shortened, the production efficiency is improved,sintering conversion is not needed, and energy waste caused by sintering conversion is avoided.

Description

technical field [0001] The invention belongs to the technical field of tungsten alloy material manufacture, and in particular relates to a method for preparing tungsten alloys with different components by sintering in the same furnace. Background technique [0002] Tungsten alloy is composed of tungsten phase with high melting point and gamma phase (Ni-Cu, Ni-Fe) with lower melting point. The melting point of the two phases is very different (the melting point of tungsten phase is 3410 ℃, and the melting point of gamma phase is lower). , while tungsten alloys are usually sintered in liquid phase. During the sintering process, the sintering temperature and holding time must be strictly controlled. According to the equilibrium phase diagram of W-Ni-Fe alloy, if the content of tungsten in the alloy is high, the sintering temperature should be increased. On the contrary, when the content of tungsten is reduced, the sintering temperature should be lowered. In conventional tungste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C27/04B22F1/00
CPCC22C1/045C22C27/04B22F1/052
Inventor 赵永华郑军张广卫潘王虎白磊张磊杨孟霞吕娟宁
Owner XIAN HUASHAN TUNGSTEN PROD CO LTD
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