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Spark plug

A technology of spark plug and spark discharge, which is applied in the field of spark plugs, can solve the problems such as the reduction of insulator withstand voltage characteristics, and achieve the effect of high withstand voltage characteristics

Active Publication Date: 2010-03-24
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the insulator is not densified, or even though it appears to be densified, many pores remain in the grain boundaries composed of alumina grains, and the withstand voltage characteristics of the insulator are lowered

Method used

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Embodiment

[0131] Alumina powder (containing a small amount of Na as an unavoidable impurity) having an average particle size of 2.1 μm and a purity of 99.5% or higher, SiO having an average particle size of 2.8 μm and a purity of 99.5% or higher 2 Powder, MgCO with an average particle size of 6.0 μm and a purity of 99.5% or more 3 Powder, CaCO with an average particle size of 2.0 μm and a purity of 99.5% or more 3 Powder, BaCO with an average particle size of 5.0 μm and a purity of 99.5% or more 3 Powder, La with an average particle diameter of 9.0 μm and a purity of 99.5% or more 2 o 3 Powder, Nd with an average particle size of 4.0 μm and a purity of 99.5% or more 2 o 3 Powder, Sm having an average particle size of 3.0 μm and a purity of 99.5% or more 2 o 3 Powder, Er with a purity of 99.5% or more 2 o 3 Powder, Yb having an average particle size of 1.3 μm and a purity of 99.5% or more 2 o 3 Powder, and Y having an average particle diameter of 1.0 μm and a purity of 99.5% or...

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Abstract

An object of the invention is to provide a spark plug including an insulator which is difficult to cause breakdown and exhibits higher withstand voltage characteristics. This invention relates to a spark plug 1 including a center electrode 2, an insulator 3 and a grounding electrode 6, wherein the insulator is formed by an alumina-based sintered body which has a theoretical density ratio of 95.0%or more, which contains a rare earth element component, Si component, and at least two kinds of Group 2 element (2A) components, and in which the rare earth element being dispersed so as to satisfy the following condition: <Condition> when 7 places of measurement line (measurement length: 180 ¢mu!m) are selected in the alumina-based sintered body and the rare earth element (RE) present in each ofselected measurement lines is analyzed with an energy dispersion method, a total number of measurement lines in which 8 or more peaks derived from the rare earth element (RE) are observed is 4 placesor more of the 7 places.

Description

technical field [0001] The present invention relates to spark plugs. More particularly, the present invention relates to a spark plug including an insulator, which is difficult to cause breakdown and exhibits higher withstand voltage characteristics. Background technique [0002] Generally, a spark plug for an internal combustion engine such as an automobile engine includes an insulator for a spark plug (hereinafter also simply referred to as an "insulator") made of aluminum oxide (Al 2 o 3 ) type material obtained alumina-based sintered body formation. The reason why the insulator is formed of an alumina-based sintered body is that the alumina-based sintered body has excellent heat resistance, mechanical strength, and withstand voltage characteristics. For firing alumina-based sintered bodies, for example, silica (SiO 2 ), calcium oxide (CaO) and magnesium oxide (MgO) three-component system sintering aid to reduce firing temperature and improve sinterability. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/38C04B35/111
CPCC04B2235/3418C04B2235/3206H01T13/38C04B2235/3215C04B2235/6567C04B2235/3208C04B35/111C04B2235/80C04B2235/3222C04B2235/77C04B2235/3227C04B2235/96C04B2235/786C04B2235/656C04B2235/3224C04B2235/5436C04B2235/3225H01B1/12
Inventor 黑野启一本田稔贵竹内裕贵光冈健田中邦治高冈胜哉
Owner NGK SPARK PLUG CO LTD