| 摘要 |
PURPOSE:To prevent rupture of a nozzle part, by a method wherein a nozzle part for the auxiliary chamber of an internal-combustion engine is made of a ceramic sintering material, and a ceramic porous material is used in a surface part where a high thermal strain is yielded due to cooling of a cylinder block. CONSTITUTION:A nozzle part for an auxiliary chamber is formed with a body 1 and a surface part 2 integrally formed on the surface the body, and a nozzle hole 3 is formed in the base thereof. The nozzle part is formed such that sintering powder consisting of mainly silicon nitrogen is injection-molded togetherwith a binder, and the molding is sintered under a nitrogen gas atmosphere to form the body 1. Thereafter, alcohole is added to mixture of alumina fiber and alumina to prepare slurry. Slurry is applied on a surface part, centring aroung a boundary part between the side and the bottom of the body 1, and after it is dried, the resultant work is sintered under a nitrogen gas atmosphere to form a surface part 2 formed by a ceramic porous material. When, with the nozzle mounted to a diesel engine, full load operation is effected, a thermal stress exerted on the nozzle part is decreased. |
