SENSOR

• Main Authors: IMAGAWA KAZUNARI, SHIMAZAKI YUJI, FUJIMURA YOSHIYUKI, MORI KENTARO, FURUTA HIROYA
• Format: Patent
• Language: English; Japanese
• Published: 12.12.2019
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; METALLURGY; PHYSICS; TESTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide a sensor which is excellent in brittleness and oxidation resistance in a high temperature environment, and in which the occurrence of the falling and/or cracking of a cover body can be suppressed.SOLUTION: A sensor 2 is provided that is fitted to an exhaust pipe of an internal combustion engine, the sensor 2 comprises: a sensing part 8 detecting the condition of gas to be measured; a cylindrical cover body 42 surrounding the radial periphery of the sensing part 8; and a housing 38, wherein the cover body 42 is composed of austenitic stainless steel containing Cr: 18 mass% or more and 22 mass% or less, Ni: 7 mass% or more and 12 mass% or less, Si: 1.0 w% or more and 3.0 mass% or less, C: 0.08 mass% or less, Mn: 2.0 mass% or less, P: 0.04 mass% or less, S: 0.01 mass% or less, Nb: 0.05 mass% or more and 0.3 mass% or less, N: 0.1 mass% or more and 0.25 mass% or less, REM: 0.001 mass% or more and 0.1 mass% or less and the remainder composed of Fe and inevitable impurities.SELECTED DRAWING: Figure 1 【課題】高温環境下での脆性及び耐酸化性に優れ、カバー体の脱落やクラックが生じることを抑制できるセンサを提供する。【解決手段】内燃機関の排気管に取り付けられるセンサ２であって、被測定ガスの状態を検出するセンシング部８と、センシング部８の径方向周囲を取り囲む筒型のカバー体４２と、ハウジング３８と、を備えたセンサにおいて、カバー体４２は、Ｃｒ：１８質量％以上２２質量％以下、Ｎｉ：７質量％以上１２質量％以下、Ｓｉ：１．０質量％以上３．０質量％以下、Ｃ：０．０８質量％以下、Ｍｎ：２．０質量％以下、Ｐ：０．０４質量％以下、Ｓ：０．０１質量％以下、Ｎｂ：０．０５質量％以上０．３質量％以下およびＮ：０．１質量％以上０．２５質量％以下、ＲＥＭ：０．００１質量％以上０．１質量％以下を含有し、残部がＦｅおよび不可避的不純物からなるオーステナイト系ステンレス鋼で構成される。【選択図】図１