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Preparation method of NiAlIr alloy

A technology of alloy and alloy liquid, which is applied in the field of NiAlIr alloy preparation, can solve the problems of difficult metal wire, brittleness, and inability to be popularized and applied, and achieve the effect of good surface quality, uniform structure distribution, and internal compactness

Active Publication Date: 2017-06-23
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the NiAlIr alloy is composed of NiAl phase and IrAl phase with a B2 crystal structure, the NiAlIr alloy with this crystal structure presents a very serious brittleness, which makes it difficult to make metal wires of about φ1mm through plastic processing, so it cannot be popularized at present. application

Method used

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  • Preparation method of NiAlIr alloy
  • Preparation method of NiAlIr alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Taking the preparation of a NiAlIr alloy with a component content (atomic percentage) of 20% nickel, 50% aluminum, and 30% iridium as an example, the following steps are included:

[0051] (1) Mold installation: Assemble a graphite mold with a cavity diameter of 0.8 mm and a length of 5 mm in the negative pressure suction casting system in the vacuum arc furnace;

[0052] (2) Load samples: turn on the vacuum arc furnace, and put high-purity Ni, Al and Ir with a nominal composition of 50Al-20Ni-30Ir (> 99.9wt.%) placed in the crucible of the vacuum arc furnace;

[0053] (3) Vacuum: Open the vacuum valve and pump to a vacuum of 1.0×10 -3 MPa, then tighten the vacuum valve;

[0054] (4) Inflation: Flush argon gas into the sample chamber of the vacuum arc furnace to a vacuum degree of 0.7MPa;

[0055] (5) Repeat steps 3 to 4;

[0056] (6) The vacuum arc furnace is energized to start the arc to melt Ni, Al and Ir, and continue to heat until the metal is melted and then continue to heat...

Embodiment 2

[0062] The difference between this embodiment and embodiment 1 is that the composition (atomic percentage) of NiAlIr alloy is 10% nickel, 50% aluminum, and 40% iridium. In step 3, the vacuum degree is 1.5×10. -3 MPa, suction casting NiAlIr alloy wire, the heating temperature in step 6 is 2600℃, the heat preservation in step 7 is 1 min, and the output current of magnetic stirring is 30A. Due to the large diameter and length of NiAlIr alloy wire, argon is filled in step 8 to a vacuum of 0.85MPa , To increase the casting pressure of alloy wire.

[0063] The structure and phase analysis of the NiAlIr alloy prepared in this example are consistent with the results of Example 1, and will not be repeated here.

Embodiment 3

[0065] The difference between this embodiment and embodiment 1 is that the composition (atomic percentage) of the NiAlIr alloy is 15% nickel, 50% aluminum, and 35% iridium. In step 3, the vacuum degree is 1.2×10. -3 MPa, suction casting NiAlIr alloy wire, the heating temperature in step 6 is 2580 ℃, the holding time in step 7 is 0.8 min, and the output current of magnetic stirring is 25A. Because the diameter and length of the alloy wire are centered, argon is filled in step 8 to a vacuum of 0.80 MPa .

[0066] The structure and phase analysis of the NiAlIr alloy prepared in this example are consistent with the results of Example 1, and will not be repeated here.

[0067] In summary, the NiAlIr alloy wire prepared by the invention has uniform composition, compact microstructure, regular size and shape, reduces the amount of precious metal iridium in the spark plug electrode sheet, and reduces the production cost.

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Abstract

The invention provides a preparation method of a NiAlIr alloy. The preparation method is method that after being smelted, raw materials are cast through pressure to obtain the nickel aluminum iridium alloy under the condition of vacuum. Compared with the prior art, the preparation method has the advantages that the NiAlIr alloy prepared by the provided preparation method of the NiAlIr alloy is completely composed of a NiAl phase and an IrAl phase of a B2 crystal structure; structure distribution of the NiAlIr alloy is uniform; the minimum diameter of a prepared NiAlIr alloy wire is up to 0.8 mm; and a difficult problem that the NiAlIr alloy material used for an electrode slice of sparking plug can not be prepared in the prior art is solved; and therefore, application prospects of the preparation method of the NiAlIr alloy are very broad.

Description

Technical field [0001] The invention relates to the field of automobile spark plugs, in particular to a method for preparing an alloy, in particular to a method for preparing a NiAlIr alloy with good thermal, electrical and corrosion resistance. Background technique [0002] There are spark plugs on gasoline engines, one for each cylinder, and some high-speed gasoline engines also 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. [0003] The function of the spark plug is to introduce the high voltage electricity (above 10,000 volts) generated by the ignition coil into the engine cylinder, and generate a spark between the spark plug electrodes to ignite the air-fuel mixture. Among them, the working environment of the spark plug electrode as a discharge component is extremely harsh. For example, during the intake stroke, the temperature is 60-90°C, and the pressure is about 98...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/04C22C30/00B22D18/06
CPCB22D18/06C22C5/04C22C30/00
Inventor 王振生苏新彭真谭清奇宋力罗智浩
Owner HUNAN UNIV OF SCI & TECH
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