The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 1980
Filed:
Dec. 16, 1977
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A method of surface hardening a substrate made of an inorganic material by diffusing a different inorganic material into the substrate is disclosed wherein the diffusion is effected in an alkali metal gas atmosphere. The substrate may be made of titanium, zirconium, iron, yttrium, tungsten, tantalum or a material containing one of those elements as a principle component. The diffusion material may be boron, silicon or a material containing one of those elements. The alkali metal gas atmosphere is produced by heating metallic sodium, potassium, lithium or a combination thereof. The surface hardened substrate produced according to the method exhibits an increased Young's modulus of elasticity, hardness and mechanical strength and is particularly suitable in the manufacture of electro-acoustic diaphragms as well as other light weight, high mechanical strength articles.