Abstract:
A movable wall member in the form of an exhaust valve spindle (1) or a piston (7) in an internal combustion engine is on the side of the wall member facing a combustion chamber provided with a hot-corrosion-resistant material (5, 14) made from a particulate starting material of an alloy containing nickel and chromium which by a HIP process has been unified to a coherent material substantially without melting the starting material. The corrosion-resistant material has a hardness of less than 310 HV measured at approximately 20 DEG C after the material has been heated to a temperature within the range of 550-850 DEG C for more than 400 hours.
Abstract:
Method of operating a catalytic ignition internal combustion engine wherein the fuel is injected into a combustion chamber (24) at a time near maximum compression such that at least part of the fuel impinges upon an oxidation catalyst surface (14) comprising a portion of the wall (11) of said combustion chamber, said catalytic surface (14) being insulated from the surroundings external to the combustion chamber by a low thermal conductivity material (13), said catalytic surface (14) preferably comprising platinum. Also disclosed are combustion chambers constructed specially for the use of this method and the methods of constructing them.
Abstract:
A heat resistant member includes a metal or ceramic substrate (1) and a thermal-barrier coating layer (4) disposed on the substrate. The thermal-barrier coating layer includes a metal layer (2) functioning as a bonding layer and one or more ceramic layers (3) disposed on the metal layer. At least one of the ceramic layers (3) is mainly composed of a hafnium oxide-based ceramic layer containing 85% or more of hafnium oxide. Due to the above structure, there can be provided a heat resistant member with high heat resistance and durability which has a thermal-barrier coating layer (4) with stable thermal conductivity at elevated temperatures, namely, not less than 1,200°C, and resistance to cracking and delamination due to sintering.
Abstract:
A method for preventing the deposit on a metal surface of thermal degradation products selected from metal sulfides, metal oxides or mixtures thereof derived from the reaction of sulfur, oxygen or mixtures thereof in hydrocarbon fluid with metal atoms which diffuse to the surface, comprises applying to the metal surface a diffusion barrier coating comprising a thermally stable metal oxide, amorphous glass, metal fluoride or mixtures thereof, the metal oxide, amorphous glass, metal fluoride or mixtures thereof being applied by chemical vapor deposition (CVD), e.g. by effusive CVD of an organometallic compound on the surface without the use of carrier gas, without pre-oxidation of the surface and without thermal decomposition of the diffusion barrier coating material. Examples of coating materials deposited by effusive CVD are Ta₂0₅, Si0₂, Ti0₂, spinel and Al₂0₃. Articles having the coated surfaces find utility in components subjected to high temperatures wherein the components are in contact with hydrocarbon fluids without additives, without special attention to quality control and without the need for special processing.
Abstract translation:一种用于防止金属表面沉积在烃流体与扩散到表面的金属原子的硫,氧或其混合物的金属硫化物,金属氧化物或其混合物中的热降解产物沉积的方法包括: 金属表面是包含热稳定金属氧化物,无定形玻璃,金属氟化物或其混合物的金属氧化物,非晶玻璃,金属氟化物或其混合物的扩散阻挡涂层,其通过化学气相沉积(CVD)施加,例如 通过在不使用载气的情况下在表面上进行有机金属化合物的高效CVD,而不会使表面预氧化并且不会扩散阻挡涂层材料的热分解。 通过渗透CVD沉积的涂层材料的实例是Ta 2 O 5,SiO 2,TiO 2,尖晶石和Al 2 O 3。 具有涂层表面的制品在经受高温的组分中发挥作用,其中组分与没有添加剂的烃流体接触,而不特别注意质量控制,并且不需要特殊加工。
Abstract:
Bei einem Zylinderkopf (1) eines Kolbenmotors besteht ein wärmeisolierendes Bauteil mit Öffnungen zur Aufnahme von Ventilsitzen, Zündkerzen, Einspritzdüsen aus einer kreisförmigen Aluminiumtitanatplatte (2), die in einen flachen und im Zylinderkopf (1) eingespannten oder eingeschrumpften Kreisring (12) aus Zirkonoxid eingeschrumpft ist. Die kreisförmige Platte (2) aus Aluminiumtitanat bildet den größten Teil des Zylinderkopfbodens (9).
Abstract:
A heat resistant member includes a metal or ceramic substrate and a thermal-barrier coating layer disposed on the substrate. The thermal-barrier coating layer includes a metal layer functioning as a bonding layer and one or more ceramic layers disposed on the metal layer. At least one of the ceramic layers is mainly composed of a hafnium oxide-based ceramic layer containing 85% or more of hafnium oxide. Due to the above structure, there can be provided a heat resistant member with high heat resistance and durability which has a thermal-barrier coating layer with stable thermal conductivity at elevated temperatures, namely, not less than 1,200°C, and resistance to cracking and delamination due to sintering.
Abstract:
본 발명의 과제는, 종래보다 부식성 가스의 침입을 억제할 수 있는 표면 보호막을 제공하는 것에 있다. 본 발명의 표면 보호막은, 이트리아 (Y 2 O 3 ) 를 주성분으로 하고, 세륨을 함유하는 막이다. 세륨을 함유함으로써, 막 중의 미소 포어 등의 결함을 감소시켜, 부식성 가스의 침입을 억제할 수 있다.