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Aluminium-oxide-based spark plug insulation material and preparation method thereof

A technology based on spark plugs and insulating materials, applied in the field of alumina-based spark plug insulating materials and their preparation, can solve the problems of insulator breakdown and the like

Inactive Publication Date: 2015-04-22
NINGBO DIYANG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working condition of the spark plug is high-voltage instantaneous discharge. If the above-mentioned undensified alumina-based sintered body is used as an insulator, under high-voltage conditions, a strong electric field will be concentrated in the residual pores, which may stimulate strong air ionization. lead to insulator breakdown

Method used

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  • Aluminium-oxide-based spark plug insulation material and preparation method thereof
  • Aluminium-oxide-based spark plug insulation material and preparation method thereof
  • Aluminium-oxide-based spark plug insulation material and preparation method thereof

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preparation example Construction

[0029] The embodiment of the present invention discloses a preparation method of an alumina-based spark plug insulating material, which includes the following steps:

[0030] 95-97 parts by weight of alumina powder, 1-3 parts by weight of silicon dioxide powder, 0.5-1 part by weight of magnesium carbonate powder, 0.2-0.5 parts by weight of calcium carbonate powder, 0.2-0.5 parts by weight of barium carbonate powder, lanthanum oxide powder 0.1 to 0.5 parts by weight, 0.2 to 0.5 parts by weight of yttrium oxide powder, 0.1 to 0.5 parts by weight of scandium oxide powder and 0.1 to 0.3 parts by weight of titanium oxide powder are added to the ball mill, mixed and pulverized by alumina balls, and the ball milling time is 10~ 14h, obtain the first mixed material;

[0031] The first mixed material is heated to 300°C under a mixed atmosphere of nitrogen and oxygen, and the second mixed material is obtained after gravity-free mixing;

[0032] The second mixed material is filtered and...

Embodiment 1

[0048] The raw material powder feeding ratio of firing the alumina-based sintered body is: 95.5 parts by weight of alumina powder, 2 parts by weight of silicon dioxide powder, 0.5 part by weight of magnesium carbonate powder, 0.4 part by weight of calcium carbonate powder, and 0.4 part by weight of barium carbonate powder, 0.25 parts by weight of lanthanum oxide powder, 0.5 parts by weight of yttrium oxide powder, 0.25 parts by weight of scandium oxide, and 0.2 parts by weight of titanium oxide powder.

[0049] Put the above raw material powder into the QM-3B high-speed vibrating ball mill, and use alumina balls with a diameter of 10mm for mixing and crushing. The ball milling time is 10h, and the material is discharged after the ball milling is completed.

[0050] Add raw material powder after ball milling figure 1 In the shown improved heatable atmosphere control gravity-free mixer (volume 3L), the control intake composition is nitrogen: oxygen=9:1 (volume ratio), the contro...

Embodiment 2

[0054] The raw material powder feeding ratio of firing the alumina-based sintered body is: 96 parts by weight of alumina powder, 2 parts by weight of silicon dioxide powder, 0.5 part by weight of magnesium carbonate powder, 0.5 part by weight of calcium carbonate powder, 0.2 part by weight of barium carbonate powder, 0.25 parts by weight of lanthanum oxide powder, 0.5 parts by weight of yttrium oxide powder, 0.25 parts by weight of scandium oxide, and 0.1 part by weight of titanium oxide powder.

[0055] Put the above raw material powder into the QM-3B high-speed vibrating ball mill, and use alumina balls with a diameter of 10mm for mixing and crushing. The ball milling time is 10h, and the material is discharged after the ball milling is completed.

[0056] The raw material powder after ball milling is added as figure 1 In the shown improved heatable atmosphere control gravity-free mixer (volume 3L), the intake composition is controlled to be nitrogen: oxygen = 9:1 (volume ra...

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Abstract

The invention provides an aluminium-oxide-based spark plug insulation material and a preparation method thereof. The preparation method comprises the following steps: adding aluminium oxide powder, silicon dioxide powder, magnesium carbonate powder, calcium carbonate powder, barium carbonate powder, lanthanum oxide powder, yttrium oxide powder, scandium oxide powder and titanium oxide powder in a ball mill, mixing and crushing by virtue of aluminium oxide balls, then heating under the mixed atmosphere of nitrogen and oxygen, mixing without a gravity, filtering and forming, sintering and then obtaining the aluminium oxide-based spark plug insulation material. According to the preparation method provided by the invention, the dispersions of the raw material powders are more uniform by virtue of the zero-gravity mixing method, a glass phase area is reduced by an La-beta-aluminium oxide phase obtained through Si-Al-La co-growth, and thus an aluminium oxide-based sintered body has higher high-temperature voltage-resistant characteristic; an Sc2Si2O7 refractory phase is formed by the co-melting overgrowth of scandium oxide and SiO2 at the edges of fine grains, thus improving the high-temperature high-atmospheric-pressure-resistant performance of the aluminium oxide-based sintered body.

Description

technical field [0001] The invention relates to the technical field of spark plug insulating materials, in particular to an alumina-based spark plug insulating material and a preparation method thereof. Background technique [0002] Spark plugs cooperate with the ignition system and fuel supply system to make the engine work, and to a large extent determine the performance of the engine together, and are essential accessories for modern engines. The function of the spark plug is to introduce the high-voltage electricity generated by the ignition coil into the combustion chamber of the engine, form a high-energy electric spark in its electrode gap, and ignite the compressed mixed gas to make the engine work. The spark plug insulator is a key part of the spark plug. If the insulator is unqualified, the high voltage used for the ignition of the spark plug may not be able to reach the spark plug electrode smoothly, resulting in no spark. [0003] Generally speaking, the spark p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 吴涵
Owner NINGBO DIYANG ELECTRONICS TECH