Iridium-nickel alloy and preparation method and application thereof

A technology of nickel alloy and alloy liquid, applied in the field of spark plug iridium electrode preparation, can solve the problems of easy falling off of alloy, large thermal expansion coefficient of nickel-based alloy, limited application, etc., and achieve the effect of saving precious metal and good resistance to cold and heat fatigue.

Inactive Publication Date: 2018-05-11
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the thermal expansion coefficient of iridium and iridium-rhodium alloy is small, and the thermal expansion coefficient of nickel-based alloy is large. After welding, the alternating action of cold and heat during use will easily cause iridium and iridium-rhodium alloy to fall off and fail, especially for larger-sized iridium and iridium-rhodium alloys. Rhodium alloys fall off more easily
In addition, the high prices of iridium and iridium-rhodium alloys also limit the application of iridium and iridium-rhodium alloys as spark plug electrode materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An iridium-nickel alloy is composed of the following components in mass percentage: 40% iridium and 60% nickel. Its preparation method comprises the following steps:

[0038] (1) Mold installation: Assemble a smelting mold with a cavity diameter of 20 mm and a length of 60 mm in a vacuum electric arc furnace;

[0039] (2) Loading samples: start the vacuum electric arc furnace, put 40g of high-purity iridium (>99.9 wt.%) and 60g of high-purity nickel (>99.9 wt.%) into the crucible of the vacuum electric arc furnace;

[0040] (3) Vacuuming: Open the vacuum valve and evacuate the vacuum electric arc furnace to a vacuum degree of 2.0×10 -3 MPa, then tighten the vacuum valve;

[0041] (4) Gas filling: fill the sample chamber of the vacuum electric arc furnace with argon until the vacuum degree is 0.50MPa;

[0042] (5) Repeat step (2) to step (3);

[0043] (6) The vacuum electric arc furnace is energized, the arc is melted to melt the mixture of Ni and Ir, and the heating...

Embodiment 2

[0053] An iridium-nickel alloy is composed of the following components in mass percentage: 70% iridium and 30% nickel. Its preparation method comprises the following steps:

[0054] (1) Mold installation: Assemble a smelting mold with a cavity diameter of 30 mm and a length of 50 mm in a vacuum electric arc furnace;

[0055] (2) Loading samples: start the vacuum electric arc furnace, put 70g of high-purity iridium (>99.9 wt.%) and 30g of high-purity nickel (>99.9 wt.%) into the crucible of the vacuum electric arc furnace;

[0056] (3) Vacuuming: Open the vacuum valve and evacuate the vacuum electric arc furnace to a vacuum degree of 5.0×10 -3 MPa, then tighten the vacuum valve;

[0057] (4) Gas filling: fill the sample chamber of the vacuum electric arc furnace with argon until the vacuum degree is 0.80MPa;

[0058] (5) Repeat steps (2) to (3) twice;

[0059] (6) The vacuum electric arc furnace is energized, the arc is melted to melt the mixture of Ni and Ir, and the heati...

Embodiment 3

[0069] An iridium-nickel alloy is composed of the following components in mass percentage: 50% iridium and 50% nickel. Its preparation method comprises the following steps:

[0070] (1) Mold installation: Assemble a smelting mold with a cavity diameter of 45 mm and a length of 20 mm in a vacuum electric arc furnace;

[0071] (2) Loading samples: start the vacuum electric arc furnace, put 50g of high-purity iridium (>99.9 wt.%) and 50g of high-purity nickel (>99.9 wt.%) into the crucible of the vacuum electric arc furnace;

[0072] (3) Vacuuming: Open the vacuum valve and evacuate the vacuum electric arc furnace to a vacuum degree of 3.5×10 -3 MPa, then tighten the vacuum valve;

[0073] (4) Gas filling: fill the sample chamber of the vacuum electric arc furnace with argon until the vacuum degree is 0.65MPa;

[0074] (5) Repeat steps (2) to (3) three times;

[0075] (6) The vacuum electric arc furnace is energized, the arc is melted to melt the mixture of Ni and Ir, and the...

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Abstract

The invention provides an iridium-nickel alloy and a preparation method and application of the iridium-nickel alloy. The iridium-nickel alloy is composed of, by mass, 40%-70% of iridium and 30%-60% ofnickel. The preparation method of the iridium-nickel alloy comprises the following steps that (1) the iridium and the nickel are weighed according to the mass percent and placed in a vacuum environment; (2) the mixture of the iridium and the nickel are heated, and alloy liquid is obtained; (3) the alloy liquid obtained in the step (2) is poured into a smelting mold for casting; (4) homogenizationtreatment is conducted on an iridium-nickel alloy ingot obtained in the step (3). The iridium-nickel alloy is an intermediate layer welding material, good welding between iridium, IrRh10, IrRh25, IrRh40, Inconel 600 and the like and the iridium-nickel alloy can be achieved, and the problem of welding between the iridium-nickel alloy and the iridium, the IrRh10, the IrRh25, the IrRh40 and the Inconel 600 alloy is finally solved. The iridium-nickel alloy is used for preparation of a sparking plug electrode, and noble metal can be saved by 30%-60%.

Description

technical field [0001] The invention belongs to the technical field of preparation of iridium electrodes for spark plugs, and in particular relates to an iridium-nickel alloy, a preparation method and an application thereof. Background technique [0002] All gasoline engines have spark plugs, one per cylinder, and some high-speed gasoline engines have two spark plugs per cylinder. Although the spark plug is small, it affects the engine's starting ability, fuel consumption and exhaust emission level. If the engine is the heart of the car, then the spark plug is the "pacemaker" of the "heart". [0003] The function of the spark plug is to introduce the high-voltage electricity (above 10,000 V) generated by the ignition coil into the engine cylinder, and generate sparks between the electrodes of the spark plug to ignite the air-fuel mixture. Among them, the working environment of the spark plug electrode as the discharge part is extremely harsh. Take the spark plug of an ord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/04C22C19/03C22C1/02H01T13/39
CPCH01T13/39C22C1/02C22C5/04C22C19/03
Inventor 王振生陈光云吴克军
Owner HUNAN UNIV OF SCI & TECH
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