Microwave excitation auto-igniting synthesizing method for porous titanium nickel alloy

A synthesis method and self-propagating combustion technology, which is applied in the field of microwave chemical self-propagating combustion synthesis, can solve the problems of high brittleness of titanium-nickel alloys and shorten the residence time, and achieve the advantages of reducing high-temperature oxidation burning loss, simplifying synthesis equipment, and short heating time Effect

Inactive Publication Date: 2008-03-12
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention proposes a microwave-excited self-propagating synthesis method for porous titanium-nickel alloys, which can shorten the residence time of titanium and nickel raw material powders at high temperatures, reduce oxidation and pollution on the metal surface, improve the purity of titanium-nickel alloys, and overcome existing self-propagating The brittleness of titanium-nickel alloy synthesized by combustion can be improved, and at the same time, it can improve heating efficiency, increase production efficiency, reduce energy consumption, save the electronic ignition device of traditional self-propagating combustion synthesis, simplify equipment, simplify operation, and can replace traditional self-propagating combustion Synthesis process for the synthesis of various materials

Method used

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  • Microwave excitation auto-igniting synthesizing method for porous titanium nickel alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The first step, mixing powder:

[0026] Powder raw materials: 99.0% purity, 300-mesh Ti powder, 99.6% purity, 300-mesh Ni powder.

[0027] No pore-forming agent was added (addition amount was 0).

[0028] Put the above powder into the powder mixer according to the ratio of titanium to nickel atomic ratio = 50:50, the speed of the powder mixer is 100 rpm, and the mixing time is 2 hours.

[0029] The second step, billet making:

[0030] Put the mixed powder into the mold cavity and press it into a billet, and the range of the applied pressure is 5MPa. 5% turpentine is added during pressing.

[0031] The third step, microwave synthesis:

[0032] Open the door of the microwave oven, put the gas chamber into the microwave oven, and connect the gas circuit.

[0033] Install the feed table, powder compact sample, initiator, and gas hood in sequence.

[0034] Close the furnace door and pass in an inert protective gas.

[0035] Set the microwave power and time, the sample...

Embodiment 2

[0042] The first step, mixing powder:

[0043] Powder raw materials: 99.5% purity, 300-mesh Ti powder, 99.7% purity, 250-mesh Ni powder.

[0044] Add 10% TiH pore-forming agent, TiH powder with a purity of 99.5% and a particle size of 300 mesh.

[0045] Put the above powder into the powder mixer according to the ratio of titanium to nickel atomic ratio = 50.5:49.5, the speed of the powder mixer is 200 rpm, and the mixing time is 4 hours.

[0046] The second step, billet making:

[0047] Put the mixed powder into the mold cavity and press it into a billet, and the range of the applied pressure is 30MPa. No excipients are added during the pressing process.

[0048] The third step, microwave synthesis:

[0049] Open the door of the microwave oven, put the gas chamber into the microwave oven, and connect the gas circuit.

[0050] Install the feed table, powder compact sample, initiator, and gas hood in sequence.

[0051] Close the furnace door and pass in an inert protective...

Embodiment 3

[0059] The first step, mixing powder:

[0060] Powder raw materials: 99.5% purity, 300-mesh Ti powder, 99.7% purity, 250-mesh Ni powder.

[0061] Add 10% (NH 4 ) 2 CO 3 Porogen, (chemically pure).

[0062] Put the above powder into the powder mixer according to the ratio of titanium to nickel atomic ratio = 50:50, the speed of the powder mixer is 300 rpm, and the mixing time is 12 hours.

[0063] The second step, billet making:

[0064] Put the mixed powder into the mold cavity and press it into a billet, and the range of the applied pressure is 60MPa. No excipients are added during the pressing process.

[0065] The third step, microwave synthesis:

[0066] Open the door of the microwave oven, put the gas chamber into the microwave oven, and connect the gas circuit.

[0067] Install the feed table, powder compact sample, initiator, and gas hood in sequence.

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Abstract

The invention provides a synthesizing method of microwave exciting self-propagation for a porous Ti-Ni alloy, which pertains to a self-propagating synthesizing method for powder metallurgy. The method comprises such procedures as mixing titanium powder, nickel powder and optional hole-making agent at proportion by Ti and Ni atoms 51:49 swung dash 49:51, pressing under certain pressure the mixed powder into blanks, heating by microwave the blanks in a synthesizer having a microwave generator and carrying out microwave exciting self-propagation synthesizing, and then carrying out necessary after treatment. The method can shorten the staying time of titanium and nickel powder under high temperature, lighten oxidation and pollution on surfaces of metals, improve the purity of the Ti-Ni alloy, overcome the problem of poor internal quality of Ti-Ni alloy synthesized by self-propagation through heating and pre-warming by a resistance furnace, also improve the heating efficiency, increase productivity, reduce energy consumption, eliminate an electronic igniter in prior self-propagation synthesizing, simplify equipment and operation, and can be used for synthesizing various materials by substituting the traditional self-propagation synthesizing process.

Description

Technical field: [0001] The invention belongs to the powder metallurgy preparation method of metal materials, in particular to the microwave chemical self-propagating combustion synthesis of porous titanium-nickel alloy materials. Background technique: [0002] Titanium-nickel alloys with nearly equiatomic ratios have many excellent properties and are widely used in many fields. Shape memory, superelasticity and high damping enable it to be used in machinery, electronic instruments and civil applications; high fatigue life, wear resistance and corrosion resistance, non-magnetic and non-toxic, good biocompatibility and low biodegradation making it an ideal biomedical material. [0003] In addition to superelasticity and shape memory properties, porous titanium-nickel alloys also have some properties that dense materials do not have, such as low density, high porosity, and high permeability. If these properties are combined with traditional materials, it is possible to injec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C1/04C22C14/00C22C19/03
Inventor 赵兴科罗俞华黄继华张华
Owner UNIV OF SCI & TECH BEIJING
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