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Method of hardening a beta titanium member

a beta titanium and hardening technology, applied in the direction of metallic material coating process, solid-state diffusion coating, coating, etc., can solve the problems of low wear resistance of titanium alloy, high surface processing difficulty of either material, poor adhesion between the plating layer and the titanium surface,

Inactive Publication Date: 2005-09-08
SHIMANO INC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, titanium and titanium alloy are active metals and have low wear resistance.
Also, surface processing of either material is extremely difficult.
However, plating processes encounter the problems of poor adhesion between the plating layer and the titanium surface and damage to the appearance of the titanium, and surface hardening via nitriding or carburizing encounter the problems of coarsening of the product surface and extended processing times.
Although the surface hardness can be increased using such methods, because the titanium member must be buried in oxygen-absorbing powder each time processing is carried out, the process is relatively inefficient and costly.
Furthermore, because the titanium member is buried in the oxygen-absorbing powder, the desired cooling rate cannot be obtained following the heat processing, so an appropriate aging treatment cannot be performed.

Method used

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  • Method of hardening a beta titanium member
  • Method of hardening a beta titanium member
  • Method of hardening a beta titanium member

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Embodiment Construction

[0011]FIG. 1 shows the basic construction of a particular embodiment of a beta titanium surface hardening apparatus 10 in the form of a titanium melting furnace for surface hardening a beta titanium member 11. In general, beta titanium member 11 is placed in a processing chamber S of beta titanium surface hardening apparatus 10, and then beta titanium member 11 is heated in an atmosphere comprising a gas mixture comprising oxygen and an inert gas such as argon gas. As a result, heat processing can be carried out in an atmosphere having a lower oxygen concentration than ordinary atmospheric air. In this embodiment, the oxygen concentration ranges from approximately 0.05 vol % to approximately 20 vol % (preferably approximately 1.0 vol % to approximately 10 vol %), the heating temperature ranges from approximately 700° C. to approximately 1000° C. (preferably approximately 850° C. to approximately 950° C.), and the heat processing time ranges from approximately 10 minutes to approxima...

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Abstract

A method of hardening the surface of a beta titanium member comprises the step of heating the beta titanium member in a gas mixture consisting essentially of an inert gas and oxygen.

Description

BACKGROUND OF THE INVENTION [0001] The present invention is directed to metal hardening processes and, more particularly, to a method of hardening a beta titanium member. [0002] In recent years, products made of titanium or of titanium alloy, both of which are lightweight and hard, have become widely used. However, titanium and titanium alloy are active metals and have low wear resistance. Also, surface processing of either material is extremely difficult. [0003] To overcome such problems, methods have been employed to increase the surface hardness of members formed from such metals. Such methods include forming an outer hardened layer via surface plating or hardening the product surface itself via nitriding or carburizing. However, plating processes encounter the problems of poor adhesion between the plating layer and the titanium surface and damage to the appearance of the titanium, and surface hardening via nitriding or carburizing encounter the problems of coarsening of the prod...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22F1/02C22F1/00C22F1/18C23C8/10C23C8/12C23C8/80
CPCC23C8/10
Inventor IWAI, TORUTSUBOUCHI, KENJIKASHIMOTO, YOSHIKAZUHAYASHI, KENTARO
Owner SHIMANO INC
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