Method for preparing W-Ni-Fe high-density alloy in microwave sintering way

A microwave sintering and high-density technology is applied in the field of preparing high-performance W-Ni-Fe high-density alloys, which can solve the problem of not reaching the performance range of tungsten-based high-density alloys, failing to obtain fully dense alloys, and low corresponding mechanical properties. problem, to achieve the effect of fine grain, low cost and good performance

Inactive Publication Date: 2010-01-13
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

[0003] The traditional W-Ni-Fe alloy sintering process adopts measures such as slow heating rate (about 5-10°C / min) and intermediate temperature insulation in a conventional resistance furnace to avoid alloy deformation and bubbling caused by excessive temperature gradients. And other defects, so the whole sintering cycle is longer, the production efficiency is lower, and the energy consumption is larger
[0004] In recent years, domestic and foreign studies on microwave sintering of high-density alloys, A.Upadhyaya prepared 92.5W-6.4Ni-1.1Fe alloy by microwave sintering technology, but its comprehensive mechanical properties were low (A.Upadhyaya, Microwave sinteringof W-Ni- Fe alloy, Scripta Materialia, Vol: 56, Page: 5-8, 2007); Peng Yuandong sintered 90W-7Ni-3Fe alloy in a microwave high-temperature furnace, but failed to obtain a fully dense alloy (relative density <98%), corresponding The mechanical properties are also low (Peng Yuandong, microwave sintered W-Ni-Fe high specific gravity alloy and its mechanism research, vol:37, No.1, Page: 125-129, 2008); these studies all have some shortcomings, that is, the obtained The alloy properties of this composition do not reach the performance range of tungsten-based high-density alloys for industrial applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The first step: the reduced W powder with a purity greater than 99.5% and a particle size of less than 1.98 microns, the carbonyl Ni powder with a purity greater than 99.5% and a particle size of less than 2.3 microns, and the carbonyl Fe powder with a purity greater than 99% and a particle size of less than 2.3 microns according to 93W-4.9 The mass percentage of Ni-2.1Fe is mixed in a stainless steel ball mill barrel for 5 hours, the ball milling medium is absolute alcohol or acetone, the ball-to-material ratio is 1:1, and the speed is 100rpm;

[0020] Step 2: Mold the mixed powder under a pressure of 300MPa to make a standard tensile sample with a length of 27mm, a width of 9mm, and a thickness of 4mm;

[0021] Step 3: Place the standard tensile sample obtained in the second step and 100g of auxiliary heating material SiC sheet in the alumina fiber insulation sheath, put it into the cavity of the microwave high-temperature furnace, and use a vacuum pump to pump the cav...

Embodiment 2

[0024] The first step: the reduced W powder with a purity greater than 99.5% and a particle size of less than 1.98 microns, the carbonyl Ni powder with a purity greater than 99.5% and a particle size of less than 2.3 microns, and the carbonyl Fe powder with a purity greater than 99% and a particle size of less than 2.3 microns according to 95W-3.5 The Ni-1.5Fe mass percentage ingredients are ball milled and mixed in a stainless steel ball mill cylinder for 6 hours, the ball milling medium is absolute alcohol or acetone, the ball to material ratio is 1:1, and the speed is 150rpm;

[0025] Step 2: Mold the mixed powder under a pressure of 350MPa to make a standard tensile sample with a length of 27mm, a width of 9mm, and a thickness of 4mm;

[0026] Step 3: Place the standard tensile sample obtained in the second step and 120g of auxiliary heating material SiC sheet in the alumina fiber insulation sheath, put it into the cavity of the microwave high-temperature furnace, and use a...

Embodiment 3

[0029] The first step: the reduced W powder with a purity greater than 99.5% and a particle size of less than 1.98 microns, the carbonyl Ni powder with a purity greater than 99.5% and a particle size of less than 2.3 microns, and the carbonyl Fe powder with a purity greater than 99% and a particle size of less than 2.3 microns according to 98W-1.4 The mass percentage of Ni-0.6Fe is mixed in a stainless steel ball mill barrel for 7 hours, the ball milling medium is absolute alcohol or acetone, the ball-to-material ratio is 1:1, and the speed is 200rpm;

[0030] Step 2: Mold the mixed powder under a pressure of 400MPa to make a standard tensile sample with a length of 27mm, a width of 9mm, and a thickness of 4mm;

[0031] Step 3: Place the standard tensile sample obtained in the second step and 140g of auxiliary heating material SiC sheet in the alumina fiber insulation sheath, put it into the cavity of the microwave high-temperature furnace, and use a vacuum pump to pump the cav...

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Abstract

The invention relates to a method for preparing W-Ni-Fe high-density alloy in a microwave sintering way, which comprises the following steps: 1. dispensing reduced W powder, carbonyl Ni powder and carbonyl Fe powder according to the weight percentage, then ball-milling and mixing; 2. mould-pressing the mixed powder materials under the pressure of 300-400MPa to form a pressed billet; 3. putting the pressed billet and auxiliary heating materials of SiC slices into an alumina fiber heat-preserving sheath and then putting the sheath into an oven chamber of a microwave high-temperature oven, and vacuumizing the oven chamber to the vacuum degree within 100Pa by a vacuum pump; 4. injecting mixed protection gases of N2 and H2 into the oven chamber of the microwave oven, controlling the temperature-rise speed to be 75-85 DEG C / min, heating to 1480-1500 DEG C, preserving the heat, powering the microwave oven off, and cooling to obtain the ideal alloy. The invention has simple process, convenient operation, short sintering period, low energy consumption, excellent performance as well as high compactness, fine crystal grains and even tissues of the obtained W-Ni-Fe high-density alloy, is suitable for industrial production and can substitute for the prior sintering process of the W-Ni-Fe high-density alloy.

Description

technical field [0001] The invention relates to a method for preparing a high-performance W-Ni-Fe high-density alloy; in particular, it refers to a method for preparing a W-Ni-Fe high-density alloy by microwave sintering. Background technique: [0002] Tungsten-based high-density alloy has high density, high strength, good ductility, good toughness, small thermal expansion coefficient, strong radiation absorption ability, good thermal conductivity and corrosion resistance, as well as excellent machinability and weldability, and is widely used Used in inertial components, counterweight components, and anti-ray shielding components, it is widely used in cutting-edge scientific fields, defense industry and civilian industry. [0003] The traditional W-Ni-Fe alloy sintering process adopts measures such as slow heating rate (about 5-10°C / min) and intermediate temperature insulation in a conventional resistance furnace to avoid alloy deformation and bubbling caused by excessive te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C33/02
Inventor 易健宏周承商罗述东郭颖利彭元东李丽娅
Owner CENT SOUTH UNIV
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