Non-carburized components of track-type machines having a metallurgically bonded coating

Patent metadata

Field	Value
Publication number	US-9616951-B2
Application number	US-49527109-A
Country	US
Kind code	B2
Filing date	Jun 30, 2009
Priority date	Mar 6, 2002
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

Undercarriage assembly components of track-type machines having a metallurgically bonded wear-resistant coating and methods for forming such coated undercarriage assembly components is taught herein. The bodies of the undercarriage assembly components, formed of an iron-based alloy, have a hard metal alloy slurry disposed on a surface or into an undercut or channel and then fused to form a metallurgical bond with the iron-based alloy. The wear-resistant coating comprises a fused, metal alloy comprising at least 60% iron, cobalt, nickel, or alloys thereof. The portion of the outer surface of the undercarriage assembly components having the wear-resistant coating corresponds to a wear surface of the component during operation of the endless track of the track-type vehicle.

First claim

What is claimed is:

1. A track chain bushing comprising:
a bushing comprising non-carburized hardened steel and having at least one wear surface therein, comprising an inner surface having an inner diameter and/or an outer surface having an outer diameter; and
a metallurgically bonded wear-resistant coating disposed on at least a portion of the wear surface around said inner diameter and/or said outer diameter and along at least a portion of a length of the bushing, the wear-resistant coating comprising a fused hard metal alloy comprising at least 60% by weight of iron, cobalt, nickel, or alloys thereof and having a Vickers hardness greater than 950 HV,
wherein the non-carburized hardened steel comprises medium carbon steel.

2. A method for producing the a track chain bushing comprising: a bushing comprising non-carburized hardened steel and having at least one wear surface therein, comprising an inner surface having an inner diameter and/or an outer surface having an outer diameter; and a metallurgically bonded wear-resistant coating disposed on at least a portion of the wear surface around said inner diameter and/or said outer diameter and along at least a portion of a length of the bushing, the wear-resistant coating comprising a fused hard metal alloy comprising at least 60% by weight of iron, cobalt, nickel, or alloys thereof and having a Vickers hardness greater than 950 HV, the method comprising:
coating an exposed area of a non-carburized steel bushing with a slurry comprising the fusible, hard metal alloy with at least 60% by weight of iron, cobalt, nickel, or alloys thereof in the form of a finely divided powder, polyvinyl alcohol, a suspension agent, and a deflocculant;
forming the metallurgical bond between the exposed area and the coating slurry to form the wear-resistant coating;
and hardening the coated bushing.

3. The method according to claim 1 , wherein the hardening composes induction hardening.

4. The method according to claim 1 , wherein the non-carburized steel bushing comprises medium carbon steel.

Assignees

• Wodrich Timothy D
• Deere & Co

Inventors

• Wodrich Timothy D

Classifications

• C23C24/08

  by application of heat or pressure and heat (C23C24/04 takes precedence) · CPC title

• B62D55/12

  Arrangement, location, or adaptation of driving sprockets · CPC title

• B62D55/202

  Wheel engaging parts; Wheel guides on links · CPC title

• B62D55/32

  Assembly, disassembly, repair or servicing of endless-track systems · CPC title

• B22D19/08

  for building-up linings or coverings, e.g. of anti-frictional metal · CPC title