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Spark plug

A technology of spark plugs and insulators, applied in the field of spark plugs, can solve the problem of undisclosed alkaline atmosphere tolerance, etc., and achieve the effect of excellent withstand voltage characteristics

Active Publication Date: 2015-03-04
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The spark plug described in Patent Document 1 discloses excellent resistance to an acidic atmosphere, but does not disclose resistance to an alkaline atmosphere

Method used

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Experimental program
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Effect test

Embodiment

[0069] 1. Manufacture and evaluation of alumina-based sintered body (manufacture of alumina-based sintered body)

[0070] A slurry is prepared by mixing powder of a compound as a raw material powder, polyvinyl alcohol as a binder, and water as a solvent, wherein the powder of the compound contains: alumina (Al 2 o 3 ) powder, Ti oxide as Ti compound powder, SiO as Si compound powder 2 powder, Ca, Mg, Sr or Ba carbonate as Group II element compound powder, and RE elements shown in Table 1 as RE element compound powder.

[0071] The obtained slurry is spray-dried by a spray drying method or the like to prepare a spherical granulated product having an average particle diameter of about 100 μm. Furthermore, the obtained granulated product was press-molded to form a disk-shaped unfired molded body. Under the atmospheric atmosphere, as shown in Table 2, set the firing time to be 2 to 8 hours in the range of firing temperature 1450°C to 1650°C to fire the unfired shaped body. The...

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Abstract

The present invention addresses the problem of providing a spark plug which has excellent withstand voltage characteristics at high temperatures and which has resistance to acidic atmospheres and basic atmospheres. This spark plug includes an insulating material which comprises 89 mass% or more Al component in terms of oxide amount and 0-0.2 mass%, excluding 0 mass%, Ti component in terms of oxide amount. The spark plug is characterized in that the insulating material is constituted of an alumina-based sintered object which contains, as grain boundary phases present among the alumina crystals, a first crystalline phase comprising at least one component selected from among a La component, Nd component, Pr component, Y component, Er component, Yb component, and Lu component and a second crystalline phase comprising at least one of components of Group 2 elements of the periodic table according to IUPAC Recommendations 1990, an Al component, and a Si component.

Description

technical field [0001] The present invention relates to a spark plug, and more specifically to a spark plug provided with a specific insulator. Background technique [0002] Spark plugs used in internal combustion engines such as automobile engines have, for example, aluminum oxide (Al 2 o 3 ) is an insulator for a spark plug (also referred to as an "insulator") formed of an alumina-based sintered body as the main component. As the reason why the insulator is formed of an alumina-based sintered body, the reason why the alumina-based sintered body is excellent in heat resistance, mechanical strength, and the like is listed. Such an alumina-based sintered body is formed by sintering a mixed powder containing a sintering aid containing SiO 2 And MgO etc. [0003] However, in the case of forming an insulator of a spark plug by sintering an alumina-based sintered body using a sintering aid, the sintering aid exists as a low-melting-point glass phase at the grain boundaries of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/38C04B35/111
CPCC04B2235/3418C04B2235/3206C04B2235/3201C04B2235/85G01R31/14H01T13/38C04B2235/3215C04B2235/3232G01R31/12C04B2235/3208H01T13/60C04B35/111C04B2235/80C04B2235/3222C04B2235/3213C04B2235/3227C04B2235/3224C04B2235/3481C04B2235/3225C04B35/10
Inventor 竹内裕贵横山裕田中邦治光冈健本田稔贵黑野启一高冈胜哉上垣裕则
Owner NGK SPARK PLUG CO LTD