Powder metal valve guide

#1. Field of the Invention

#The present invention relates in general to powder metal blends, and more particularly to a new and improved powder metal blend useful for making an improved engine component such as a valve guide.

#2. Description of the Related Art

#FIG. 1 is a cross sectional view illustrating a valve assembly and its associated environment;

#FIG. 2 is a cross-sectional view illustrating a valve assembly in more detail;

#FIG. 3 is a graph illustrating material and cycle effect on stem/guide wear; and

#The present invention resides in a new and improved powder metal blend that is particularly suited for an engine component like a valve guide for an internal combustion engine. It should be understood that the powder metal blend of the instant invention may be used for manufacturing any vehicle part and is not to be limited to simply a valve guide. In the specification, unless otherwise specified, all temperatures are in degrees Celsius (° C.), and all percentages (%) are on a weight percent basis.

#Powder metallurgy processes can offer a cost-effective, near-net shape production yet allow versatility in material selection and post sintering treatments. The novel material blend of the present invention offers superior properties of abrasive and adhesive wear resistance, scuffing resistance, and can run against various types of valve stems and stem coatings including chrome plated and nitrided valve stems.

#The powder metal blend in accordance with the present invention is applicable as engine components in leaded and unleaded gasoline, diesel and natural gas engines in both light and heavy duty applications. Also, the powder part produced in accordance with the present invention has superior machinability and can be employed as an intake or an exhaust valve guide.