EP 0679736 B1 19980304 - Improvement of properties of the surface of a titanium alloy engine valve
Title (en)
Improvement of properties of the surface of a titanium alloy engine valve
Title (de)
Verbesserung der Oberflächeneigenschaften eines Maschinenventils aus einer Titanlegierung
Title (fr)
Amélioration des propriétés de surface d'une soupape de moteur en alliage de titane
Publication
Application
Priority
EP 94201220 A 19940428
Abstract (en)
[origin: EP0679736A1] There is provided a new method of improving properties of the surface of an internal combustion engine valve made from titanium alloy, which comprises; the steps of (a) forming a surface undercoat layer of nickel on a surface of the engine valve (T7); (b) heating the resulting nickel undercoated valve in vacuum or in an atmosphere of inert gas (T9); (c) forming further a three component coat layer comprising nickel, phosphorus and particles of material selected from the group consisting of silicone carbide,, silicone nitride, boron nitride, and the combination thereof, on the surface of the nickel undercoat layer (T11); and (d) heating the resulting coat layer formed on the nickel undercoat layer, at the temperature of 350 DEG C to 550 DEG C, for one to four hours (T13, so as to make the particles of ceramic material uniformly and homogenously dispersed in said coat layer.
IPC 1-7
IPC 8 full level
C25D 5/50 (2006.01); C25D 15/02 (2006.01); F01L 3/04 (2006.01)
CPC (source: EP)
C25D 5/50 (2013.01); C25D 15/02 (2013.01); F01L 3/04 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0679736 A1 19951102; EP 0679736 B1 19980304; DE 69408829 D1 19980409; DE 69408829 T2 19981022
DOCDB simple family (application)
EP 94201220 A 19940428; DE 69408829 T 19940428