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A platform for research: civil engineering, architecture and urbanism
ALUMINA SINTERED BODY AND SPARK PLUG
PROBLEM TO BE SOLVED: To provide an alumina sintered body and a spark plug excellent in alkaline corrosion resistance.SOLUTION: There are provided an alumina sintered body 1 having at least a main phase 2 composed of: alumina crystal 21; a first dispersion phase 3; and a second dispersion phase 4 dispersed in the main phase 2 and a spark plug having an insulation glass composed of the alumina sintered body 1. The first dispersion phase 3 is composed of a MgAlOcrystal and the second dispersion phase contains SiOand/or CaO. The percentage content of the main phase 2 is 90 mass% or more and less than 98 mass%. A highest peak strength Iof X ray diffraction peaks derived from alumina in the alumina sintered body 1 and highest peak strength Iof X ray diffraction peaks derived from MgAlOsatisfy a relationship of 100×I/I≥5.5%. A percentage of existing area of the second dispersion phase 4 in a surface of the alumina sintered body 1 is 15.2% or less.SELECTED DRAWING: Figure 2
【課題】耐アルカリ腐食性に優れたアルミナ質焼結体及びスパークプラグを提供すること。【解決手段】アルミナ結晶２１からなる主相２と、主相２に分散された第１分散相３及び第２分散相４とを少なくとも有するアルミナ質焼結体１、及びこのアルミナ質焼結体１からなる絶縁碍子を有するスパークプラグである。第１分散相３はＭｇＡｌ2Ｏ4結晶からなり、第２分散相４はＳｉＯ2及び／又はＣａＯを含有する。主相２の含有割合は９０質量％以上かつ９８質量％未満である。アルミナ質焼結体１におけるアルミナ由来のＸ線回折ピークのうち最も高いピーク強度Ｉ1と、ＭｇＡｌ2Ｏ4由来のＸ線回折ピークのうち最も高いピーク強度Ｉ2とが１００×Ｉ2／Ｉ1≧５．５％の関係を満足する。アルミナ質焼結体１の表面における第２分散相４の存在面積が占める割合が１５．２％以下である。【選択図】図２
ALUMINA SINTERED BODY AND SPARK PLUG
PROBLEM TO BE SOLVED: To provide an alumina sintered body and a spark plug excellent in alkaline corrosion resistance.SOLUTION: There are provided an alumina sintered body 1 having at least a main phase 2 composed of: alumina crystal 21; a first dispersion phase 3; and a second dispersion phase 4 dispersed in the main phase 2 and a spark plug having an insulation glass composed of the alumina sintered body 1. The first dispersion phase 3 is composed of a MgAlOcrystal and the second dispersion phase contains SiOand/or CaO. The percentage content of the main phase 2 is 90 mass% or more and less than 98 mass%. A highest peak strength Iof X ray diffraction peaks derived from alumina in the alumina sintered body 1 and highest peak strength Iof X ray diffraction peaks derived from MgAlOsatisfy a relationship of 100×I/I≥5.5%. A percentage of existing area of the second dispersion phase 4 in a surface of the alumina sintered body 1 is 15.2% or less.SELECTED DRAWING: Figure 2
【課題】耐アルカリ腐食性に優れたアルミナ質焼結体及びスパークプラグを提供すること。【解決手段】アルミナ結晶２１からなる主相２と、主相２に分散された第１分散相３及び第２分散相４とを少なくとも有するアルミナ質焼結体１、及びこのアルミナ質焼結体１からなる絶縁碍子を有するスパークプラグである。第１分散相３はＭｇＡｌ2Ｏ4結晶からなり、第２分散相４はＳｉＯ2及び／又はＣａＯを含有する。主相２の含有割合は９０質量％以上かつ９８質量％未満である。アルミナ質焼結体１におけるアルミナ由来のＸ線回折ピークのうち最も高いピーク強度Ｉ1と、ＭｇＡｌ2Ｏ4由来のＸ線回折ピークのうち最も高いピーク強度Ｉ2とが１００×Ｉ2／Ｉ1≧５．５％の関係を満足する。アルミナ質焼結体１の表面における第２分散相４の存在面積が占める割合が１５．２％以下である。【選択図】図２
ALUMINA SINTERED BODY AND SPARK PLUG
アルミナ質焼結体及びスパークプラグ
IMADA SHOTA (author) / SUZUKI HIROBUMI (author) / ARAKI HIROSHI (author)
2016-09-05
Patent
Electronic Resource
Japanese
ALUMINA SINTERED BODY PRODUCTION METHOD AND ALUMINA SINTERED BODY
| European Patent Office | 2022