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A kind of spark plug insulator sintering aid and preparation method thereof

A technology of spark plug insulators and sintering aids, applied in the direction of organic chemistry, can solve problems such as insulator breakdown, achieve the effects of reducing sintering temperature, improving material mechanical properties, and excellent overall uniformity

Inactive Publication Date: 2017-01-04
重庆麦科斯新能源车业有限责任公司
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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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  • A kind of spark plug insulator sintering aid and preparation method thereof

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preparation example Construction

[0026] Correspondingly, the present invention also provides a preparation method of the above-mentioned sintering aid for spark plug insulators, comprising the following steps:

[0027] La(NO 3 ) 3 ·6H 2 Dissolve O and 3-pyridinecarboxylic acid in hot water at 40-80°C, then add Na 3 [CrMo 6 h 6 o 24 ]·8H 2 The aqueous solution of O obtains mixed solution, reflux reaction, after collecting filtrate, leave standstill, obtain the first solid;

[0028]The first solid and oxalyl chloride are mixed in dimethyl sulfoxide, and the solvent is removed by rotary evaporation after reflux reaction to obtain a second solid;

[0029] Dissolve the second solid in dimethyl sulfoxide by heating, add aminopropyl-heptaisobutyl-cage silsesquioxane and triethylamine, reflux reaction, remove the solvent by rotary evaporation, wash with water and filter to obtain Sintering aid for spark plug insulators.

[0030] In the above preparation process, the La(NO 3 ) 3 ·6H 2 O, 3-pyridinecarboxyl...

Embodiment 1

[0042] 0.5mol lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) Dissolve 0.5mol 3-pyridinecarboxylic acid in a certain amount of hot water at 60°C, then add 0.5mol Na 3 [CrMo 6 h 6 o 24 ]·8H 2 O aqueous solution, adjust the pH value to 3, then reflux the mixture, filter after the reflux, collect the filtrate, leave the filtrate for two weeks, and collect the precipitated solid in the filtrate.

[0043] The water consumption of above-mentioned reaction is 20L / 1mol lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) and 20L / 1mol Na 3 [CrMo 6 h 6 o 24 ]·8H 2 O.

[0044] The reflux temperature of the above mixture is 80°C; the reflux time is 2h.

[0045] The solid precipitated in the above filtrate was mixed with 50mL oxalyl chloride in dimethyl sulfoxide (DMSO), and then refluxed for 4 hours. After the reaction was completed, the solvent was removed by rotary evaporation; the solid after spinning was heated and dissolved in dimethyl In sulfoxide (DMSO), add 1mol aminopropyl-heptaisobut...

Embodiment 2

[0047] In terms of weight percentage, the raw material powder feeding ratio for firing the alumina-based sintered body is: 85% of alumina powder, 2% of the polyoxometalate sintering aid prepared in Example 1 of the present invention, 0.5% of polyethylene glycol, Methacrylamide 0.5%, ammonium citrate 1%, deionized water 11%.

[0048] Stir and mix the above-mentioned raw material powder in a mixer for 0.5h, and mix evenly. The uniformly mixed slurry is spray-dried by spray drying method, and then granulated into powder with an average particle size of about 100 μm by laser diffraction method.

[0049] The granulated powder is molded into a molded product of 10mm×10mm×3mm by isostatic pressing at 100MPa, and then the molded product is sintered at high temperature to obtain an alumina sintered body. The sintering temperature rise program is:

[0050] Room temperature ~ 200°C about 30°C / hour

[0051] 200℃~300℃ About 50℃ / hour

[0052] 300℃~700℃ About 60℃ / hour

[0053] 700℃~800℃ A...

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Abstract

The invention provides a spark plug insulator sintering aid and a preparation method thereof. The chemical formula of the spark plug insulator sintering aid is (C31H71NSi8O12)2[La(H2O)5(CrMo6h6O24)].xH2O, wherein x=1 or 2. The spark plug insulator sintering aid is a polyoxometallate sintering aid composed of a plurality of elements and is an organic / inorganic hybrid molecule; a plurality of sintering aid components can be synergistically and evenly dispersed into the raw material slurry of an aluminum oxide based sintered body in the mixing process so that the sintering temperature of the spark plug insulator, namely the aluminum oxide based sintered body, can be reduced; in addition, the La-beta-Al2O3 crystal phase can be effectively and evenly generated in the aluminum oxide based sintered body to ensure that a silicon dioxide glass phase of an obvious scale basically does not exist in the aluminum oxide based sintered body, and therefore, the high voltage resisting performance at a high temperature of the aluminum oxide based sintered body serving as the spark plug insulator can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of sintering aids, in particular to a sintering aid for spark plug insulators 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 plug insulator is made o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F19/00C04B35/632
Inventor 吴涵
Owner 重庆麦科斯新能源车业有限责任公司
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