CA1228455A - Method of applying a wear resistant and/or corrosion resistant coating to an article having an irregular surface - Google Patents
Method of applying a wear resistant and/or corrosion resistant coating to an article having an irregular surfaceInfo
- Publication number
- CA1228455A CA1228455A CA000439351A CA439351A CA1228455A CA 1228455 A CA1228455 A CA 1228455A CA 000439351 A CA000439351 A CA 000439351A CA 439351 A CA439351 A CA 439351A CA 1228455 A CA1228455 A CA 1228455A
- Authority
- CA
- Canada
- Prior art keywords
- irregular surface
- hardfacing
- sheet
- article
- brazing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
- B23K35/327—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C comprising refractory compounds, e.g. carbides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
- B23K31/025—Connecting cutting edges or the like to tools; Attaching reinforcements to workpieces, e.g. wear-resisting zones to tableware
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0244—Powders, particles or spheres; Preforms made therefrom
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0233—Sheets, foils
- B23K35/0238—Sheets, foils layered
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
A METHOD OF APPLYING A WEAR RESISTANT AND/OR CORROSION RESISTANT
COATING TO AN ARTICLE HAVING AN IRREGULAR SURFACE
Abstract of the Disclosure A method is provided for applying a wear resistant and/or cor-rosion resistant hardfacing to an article having an irregular sur-face. The method comprises providing an article having an irregular surface, supplying a brazing material adapted to come into contact with and coat at least a part of the irregular surface to be coated with a hardfacing material, positioning a sheet of hardfacing mater-ial, distributed in a polytetrafluoroethylene fibrous matrix in close proximity to but not in total direct contact with the ir-regular surface to be coated, encompassing the irregular surface together with the so-positioned brazing and hardfacing material in a pressure responsive flexible housing, applying pressure to the ex-terior of the housing to cause it to yield and thereby force the sheet of hardfacing material into direct contact with the irregular surface, and subjecting the so-treated article to a temperature sufficient to cause the polytetrafluoroethylene matrix to volatilize and the hardfacing material to form a coherent mass which is bonded to the irregular surface of the article.
COATING TO AN ARTICLE HAVING AN IRREGULAR SURFACE
Abstract of the Disclosure A method is provided for applying a wear resistant and/or cor-rosion resistant hardfacing to an article having an irregular sur-face. The method comprises providing an article having an irregular surface, supplying a brazing material adapted to come into contact with and coat at least a part of the irregular surface to be coated with a hardfacing material, positioning a sheet of hardfacing mater-ial, distributed in a polytetrafluoroethylene fibrous matrix in close proximity to but not in total direct contact with the ir-regular surface to be coated, encompassing the irregular surface together with the so-positioned brazing and hardfacing material in a pressure responsive flexible housing, applying pressure to the ex-terior of the housing to cause it to yield and thereby force the sheet of hardfacing material into direct contact with the irregular surface, and subjecting the so-treated article to a temperature sufficient to cause the polytetrafluoroethylene matrix to volatilize and the hardfacing material to form a coherent mass which is bonded to the irregular surface of the article.
Description
~L~22~r-i A MUTED OF APPLYING A WEAR RESISTANT AND/OR CORROSION RESISTANT
COATING TO AN ARTICLE WAVING AN IRREGULAR SURFACE
Background of the Invention The present invention relates to a means of bonding a coating maternal to an irregularly shaped surface.
ore particularly, the instant invention concerns a means of bonding a solid particulate hard facing material to at least a port ton of an irregularly shaped surface.
It it common practice in the industry to apply harclfacing materials to various articles. However, when it is desired to unit Eormly apply a coating of such materials to an article having an if-regularly shaped surface many problems are often encountered.
In this regard, various electrolytic plating processes are known for coating surfaces, but these techniques are limited to situations where it is desired to apply a relatively thin layer of material. To overcome this type of problem, spray techniques are generally used where thicker layers are desired. However, the major disadvantage encountered with this approach is that since these techniques are "line-of-sight" the thickness of the resultant coat-in can be very non-uniform. Another approach to the deposition of thick coatings is to provide a weld overlay. However, here too, us-less easy access is available to the surface contours of the article being coated, the weld bead will not have a uniform thickness.
Accordingly, it is the principle object of this invention to provide a means of applying a relatively thick, uniform coating of a hard facing material to an irregularly shaped surface.
Other objects of the invention will become apparent to those skilled in the art from a reading of the following specification and claims.
Summary of the Invention In the main, the present invention is directed to a process for applying a wear resistant and/or corrosion resistant hard facing material to an irregular surface of a given article, which method comprises providing an article having an irregular surface which is to be coated with a hard facing material, supplying a brazing mater-r~--9192--~5 I
tat adapted to come into contact with and coat at least a part of the irregular surface, positioning a sheet of hard facing material dls~ributed in a polytetrafluoroethylene fibrous matrix in close proximity to but not in total direct contact with the irregular surface to be coated, encompassing the irregular surface together with the so-positioned brazing and hard facing material in a pressure responsive flexible housing, applying pressure to the exterior of said housing to cause it to yield and thereby force the sheet of hardfaclng material into direct contact with the irregular surface, and subjecting said so-treated article to a temperature sufficient to cause the polytetrafluoroethylene to volatilize and the hard-facing and braze material to form a coherent mass which is bonded to the irregular surface of the article.
Brief Description of the Drawings The invention may take physical form in certain parts and arrangement of parts, the preferred embodiments which will be described in detail in the specification and illustrated in the accompanying drawings which form a part hereof and wherein:
FIG. 1 is a diagrammatical illustration of an apparatus suit-able for the practice of the subject invention; and FIG. 2 is a magnified, cross-sectional view of a portion of a threaded steel shaft having a wear resistant coating applied thereto according to the teaching of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The preferred practice of the instant invention will now be if-lust rated with respect to the following example wherein the threaded portion of a l/2 diameter steel bolt was coated with a tungsten carbide material in a nickel-rich braze alloy.
Example A steel bolt 2' long and having a diameter of 1/2' was ox-twined. The bolt was cleaned by grit blasting the surface. The bolt was characterized by having 13 threads per linear inch.
A sheet of hard facing material lo was loosely stretched over the threads lo of the bolt I Sheet lo has a matrix of fibrillated 5 polytetrafluoroethylene which entraps a solid particulate material of 65 percent by volume of tungsten carbide and 35 percent by volume of a nickel rich alloy similar to IS designation 4775. It was held in place with an adhesive material 16 which was lightly applied along the cloth periphery. however, it is not essential that an adhesive be utilized. The sheet material can simply be positioned over the article to which it is to be applied.
The bolt having the sheet of hard facing material wrapped around it was placed in a flexible rubber mold. The mouth 20 of the mold was sealed wealth a suitable rubber stopper 22. The mold was then ox-FLU tern.llly pressurized (apparatus used not shown). This was accom-plLshed by use of an isostatic press wherein the pressurizing fluid was water. Obviously, other means of exerting external pressure may be utilized and as the means of pressurizing does not form a part of the instant invention, such alternative means will not be discussed herein.
The threaded bolt having a layer or sheet of hard facing and braze material in contact with the threads thereof was subsequently placed in a furnace and heated to a temperature of about 2000 F in a vacuum atmosphere to cause the polytetrafluoroethylene to deco-pose and the hard facing and braze material present to form a bonded coherent mass.
The present invention can be used to apply a hard facing mater-tat to any article which has an irregular surface and which will not decompose or significantly soften upon heating to a temperature surf-Eicient to bond or adhere the hard facing material. Typical of such substrate materials are steels, nickel, cobalt, titanium and their respective alloys.
By the term "sheet of hard facing material" as utilized herein us meant a material of the type described in US. Patent No.
l~,l94,0~0, which is incorporated herein by reference. Specifically, the sheet of hard facing material consists essentially of from about 85 to about 99 percent by volume of a solid particulate material substantially uniformly distributed in a matrix of from about 1 to about 15 percent by volume of fibrillated polytetrafluoroethylene 5 resin with the fibrils of said polytetrafluoroethylene intercom-I
netting and entrapping the particulate material to impart a self-sustaining condition and flexibility to the sheet.
The method of producing the sheet material used in the practice of the subject invention is described in US. Patent No. 3,86~,124, which is also incorporated herein by reference. Specifically, this sheet material Lo produced by a process which comprises mechanically working, for example, by rolling, ball milling, stretching, elongate lung, spreading, and the like, a mixture of the polytetrafluoro-ethylene, and the particulate substance to form a sheet or mat having high green strength and low muddle of elasticity. This sheet or mat may then be shaped to a desired configuration and heated to a temperature where diffusion and/or melting occurs. The polytetrafluoroethylene is converted into a matrix of fibrils by mechanical working under the conditions specified. These fibrils have a diameter of less than 10 microns and generally having a ratio of length to diameter of 10 to 1 to loo to 1 or greater. The sheet or mat produced is characterized by low muddle of elasticity, that is, good cloth-like drawability and flexibility which permits it to fit closely around and conform to articles of various and diverse shapes despite its very high loading of particulate material. The filler particles in the sheet according to the invention are not chemically or metallurgically bonded to each other in the flexible non-woven composition of this invention.
The mechanical working of the mixture in the manner disclosed causes the polytetrafluoroethylene to become fibrillated and the no-suiting fi'brils to capture and interconnect the particulate mater-tats to produce a non-woven type of sheet or mat having good flex-ibLllty and high green strength. In other words, a three dime-signal matrix of Interwoven or interconnected fibrils having the particulate material uniformly distributed and Interconnected therein is produced by mechanically working the aforesaid mixtures in the manner hereinafter disclosed.
The solid particulate material employed in the sheet material can be an inter metallic abrasive material selected from the group consisting of carbides, nitrides, silicides or mixtures thereof. In addition, the solid particulate material can include a brazing at-toy.
In practice, it is preferred that the wear resistant material it a carbide selected from the group consisting of tungsten carbide, chromium carbide, tantalum carbide, titanium carbide molybdenum carbide, silicon carbide, boron carbide, or mixtures thereof.
Brazing alloys which are suitable include nickel, cobalt or iron based alloys, preferably having a Rockwell hardness on the C
scale of at least 40. In addition, nickel, cobalt, copper or silver based alloys with a melting point of less than 1200~ C can be utilized to obtain good results. In any event, the specific brazing alloy employed is not critical to the practice of the instant invent lion as brazing alloys are well known in the art. All that is no-squired is that the brazing alloy function to form a high-strength matrix and bond the hard facing material to the irregular surface.
In certain applications the function of both the wear resistant material and the brazing component may be satisfied by the same ingredient, for example, a hybrid braze. Typical examples of such hybrid brazes include nickel base brazes of the type described in material specifications AMOS, 4776 and 4777.
The brazing material can be applied either directly to the sun-face being coated or as a cloth material made in accordance with the teaching of US. Patent No. 4,194,040. That is, it can be incorpor-axed into the sheet of hard facing material; it can be applied as a separate sheet of material; or it can be applied as a laminate with a sheet of hard facing material.
From the foregoing, it is clear that the method of the instant invention provides a unique method for applying a wear resistant material to the surface of an irregularly shaped article to improve its physical properties. The present invention can be utilized, for example, to treat tool bits and the like to improve their operation-Al characteristics.
While there have been described herein what are at present con-sklerecl to be the preferred embodiments of the invention, it will be 5 appreciated by those skilled in the art that various changes and modifications may be made therein without departing from the invent lion, and it is, therefore, intended in the appended claims to cover all such changes and modifications as fall within the spirit and scope of the instant invention.
COATING TO AN ARTICLE WAVING AN IRREGULAR SURFACE
Background of the Invention The present invention relates to a means of bonding a coating maternal to an irregularly shaped surface.
ore particularly, the instant invention concerns a means of bonding a solid particulate hard facing material to at least a port ton of an irregularly shaped surface.
It it common practice in the industry to apply harclfacing materials to various articles. However, when it is desired to unit Eormly apply a coating of such materials to an article having an if-regularly shaped surface many problems are often encountered.
In this regard, various electrolytic plating processes are known for coating surfaces, but these techniques are limited to situations where it is desired to apply a relatively thin layer of material. To overcome this type of problem, spray techniques are generally used where thicker layers are desired. However, the major disadvantage encountered with this approach is that since these techniques are "line-of-sight" the thickness of the resultant coat-in can be very non-uniform. Another approach to the deposition of thick coatings is to provide a weld overlay. However, here too, us-less easy access is available to the surface contours of the article being coated, the weld bead will not have a uniform thickness.
Accordingly, it is the principle object of this invention to provide a means of applying a relatively thick, uniform coating of a hard facing material to an irregularly shaped surface.
Other objects of the invention will become apparent to those skilled in the art from a reading of the following specification and claims.
Summary of the Invention In the main, the present invention is directed to a process for applying a wear resistant and/or corrosion resistant hard facing material to an irregular surface of a given article, which method comprises providing an article having an irregular surface which is to be coated with a hard facing material, supplying a brazing mater-r~--9192--~5 I
tat adapted to come into contact with and coat at least a part of the irregular surface, positioning a sheet of hard facing material dls~ributed in a polytetrafluoroethylene fibrous matrix in close proximity to but not in total direct contact with the irregular surface to be coated, encompassing the irregular surface together with the so-positioned brazing and hard facing material in a pressure responsive flexible housing, applying pressure to the exterior of said housing to cause it to yield and thereby force the sheet of hardfaclng material into direct contact with the irregular surface, and subjecting said so-treated article to a temperature sufficient to cause the polytetrafluoroethylene to volatilize and the hard-facing and braze material to form a coherent mass which is bonded to the irregular surface of the article.
Brief Description of the Drawings The invention may take physical form in certain parts and arrangement of parts, the preferred embodiments which will be described in detail in the specification and illustrated in the accompanying drawings which form a part hereof and wherein:
FIG. 1 is a diagrammatical illustration of an apparatus suit-able for the practice of the subject invention; and FIG. 2 is a magnified, cross-sectional view of a portion of a threaded steel shaft having a wear resistant coating applied thereto according to the teaching of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The preferred practice of the instant invention will now be if-lust rated with respect to the following example wherein the threaded portion of a l/2 diameter steel bolt was coated with a tungsten carbide material in a nickel-rich braze alloy.
Example A steel bolt 2' long and having a diameter of 1/2' was ox-twined. The bolt was cleaned by grit blasting the surface. The bolt was characterized by having 13 threads per linear inch.
A sheet of hard facing material lo was loosely stretched over the threads lo of the bolt I Sheet lo has a matrix of fibrillated 5 polytetrafluoroethylene which entraps a solid particulate material of 65 percent by volume of tungsten carbide and 35 percent by volume of a nickel rich alloy similar to IS designation 4775. It was held in place with an adhesive material 16 which was lightly applied along the cloth periphery. however, it is not essential that an adhesive be utilized. The sheet material can simply be positioned over the article to which it is to be applied.
The bolt having the sheet of hard facing material wrapped around it was placed in a flexible rubber mold. The mouth 20 of the mold was sealed wealth a suitable rubber stopper 22. The mold was then ox-FLU tern.llly pressurized (apparatus used not shown). This was accom-plLshed by use of an isostatic press wherein the pressurizing fluid was water. Obviously, other means of exerting external pressure may be utilized and as the means of pressurizing does not form a part of the instant invention, such alternative means will not be discussed herein.
The threaded bolt having a layer or sheet of hard facing and braze material in contact with the threads thereof was subsequently placed in a furnace and heated to a temperature of about 2000 F in a vacuum atmosphere to cause the polytetrafluoroethylene to deco-pose and the hard facing and braze material present to form a bonded coherent mass.
The present invention can be used to apply a hard facing mater-tat to any article which has an irregular surface and which will not decompose or significantly soften upon heating to a temperature surf-Eicient to bond or adhere the hard facing material. Typical of such substrate materials are steels, nickel, cobalt, titanium and their respective alloys.
By the term "sheet of hard facing material" as utilized herein us meant a material of the type described in US. Patent No.
l~,l94,0~0, which is incorporated herein by reference. Specifically, the sheet of hard facing material consists essentially of from about 85 to about 99 percent by volume of a solid particulate material substantially uniformly distributed in a matrix of from about 1 to about 15 percent by volume of fibrillated polytetrafluoroethylene 5 resin with the fibrils of said polytetrafluoroethylene intercom-I
netting and entrapping the particulate material to impart a self-sustaining condition and flexibility to the sheet.
The method of producing the sheet material used in the practice of the subject invention is described in US. Patent No. 3,86~,124, which is also incorporated herein by reference. Specifically, this sheet material Lo produced by a process which comprises mechanically working, for example, by rolling, ball milling, stretching, elongate lung, spreading, and the like, a mixture of the polytetrafluoro-ethylene, and the particulate substance to form a sheet or mat having high green strength and low muddle of elasticity. This sheet or mat may then be shaped to a desired configuration and heated to a temperature where diffusion and/or melting occurs. The polytetrafluoroethylene is converted into a matrix of fibrils by mechanical working under the conditions specified. These fibrils have a diameter of less than 10 microns and generally having a ratio of length to diameter of 10 to 1 to loo to 1 or greater. The sheet or mat produced is characterized by low muddle of elasticity, that is, good cloth-like drawability and flexibility which permits it to fit closely around and conform to articles of various and diverse shapes despite its very high loading of particulate material. The filler particles in the sheet according to the invention are not chemically or metallurgically bonded to each other in the flexible non-woven composition of this invention.
The mechanical working of the mixture in the manner disclosed causes the polytetrafluoroethylene to become fibrillated and the no-suiting fi'brils to capture and interconnect the particulate mater-tats to produce a non-woven type of sheet or mat having good flex-ibLllty and high green strength. In other words, a three dime-signal matrix of Interwoven or interconnected fibrils having the particulate material uniformly distributed and Interconnected therein is produced by mechanically working the aforesaid mixtures in the manner hereinafter disclosed.
The solid particulate material employed in the sheet material can be an inter metallic abrasive material selected from the group consisting of carbides, nitrides, silicides or mixtures thereof. In addition, the solid particulate material can include a brazing at-toy.
In practice, it is preferred that the wear resistant material it a carbide selected from the group consisting of tungsten carbide, chromium carbide, tantalum carbide, titanium carbide molybdenum carbide, silicon carbide, boron carbide, or mixtures thereof.
Brazing alloys which are suitable include nickel, cobalt or iron based alloys, preferably having a Rockwell hardness on the C
scale of at least 40. In addition, nickel, cobalt, copper or silver based alloys with a melting point of less than 1200~ C can be utilized to obtain good results. In any event, the specific brazing alloy employed is not critical to the practice of the instant invent lion as brazing alloys are well known in the art. All that is no-squired is that the brazing alloy function to form a high-strength matrix and bond the hard facing material to the irregular surface.
In certain applications the function of both the wear resistant material and the brazing component may be satisfied by the same ingredient, for example, a hybrid braze. Typical examples of such hybrid brazes include nickel base brazes of the type described in material specifications AMOS, 4776 and 4777.
The brazing material can be applied either directly to the sun-face being coated or as a cloth material made in accordance with the teaching of US. Patent No. 4,194,040. That is, it can be incorpor-axed into the sheet of hard facing material; it can be applied as a separate sheet of material; or it can be applied as a laminate with a sheet of hard facing material.
From the foregoing, it is clear that the method of the instant invention provides a unique method for applying a wear resistant material to the surface of an irregularly shaped article to improve its physical properties. The present invention can be utilized, for example, to treat tool bits and the like to improve their operation-Al characteristics.
While there have been described herein what are at present con-sklerecl to be the preferred embodiments of the invention, it will be 5 appreciated by those skilled in the art that various changes and modifications may be made therein without departing from the invent lion, and it is, therefore, intended in the appended claims to cover all such changes and modifications as fall within the spirit and scope of the instant invention.
Claims (11)
1. A method of applying a wear resistant hardfacing to an article having an irregular surface which method comprises:
providing an article having an irregular surface which is to be coated with a hardfacing material;
supplying a brazing material adapted to become in contact with and coat at least a part of said irregular surface;
positioning a sheet of hardfacing material distributed in a polytetrafluoroethylene fibrous matrix in close proximity to but not in total direct contact with said irregular surface;
encompassing said irregular surface together with said brazing and hardfacing material in a pressure responsive flexible housing;
applying pressure to the exterior of said housing to cause it to yield and thereby force said sheet of hardfacing material into direct contact with said irregular surface; and, subjecting said so treated article to a temperature suf-ficient to cause said polytetrafluoroethylene to volatilize and said hardfacing material to form a coherent mass which is bonded to the irregular surface of said article.
providing an article having an irregular surface which is to be coated with a hardfacing material;
supplying a brazing material adapted to become in contact with and coat at least a part of said irregular surface;
positioning a sheet of hardfacing material distributed in a polytetrafluoroethylene fibrous matrix in close proximity to but not in total direct contact with said irregular surface;
encompassing said irregular surface together with said brazing and hardfacing material in a pressure responsive flexible housing;
applying pressure to the exterior of said housing to cause it to yield and thereby force said sheet of hardfacing material into direct contact with said irregular surface; and, subjecting said so treated article to a temperature suf-ficient to cause said polytetrafluoroethylene to volatilize and said hardfacing material to form a coherent mass which is bonded to the irregular surface of said article.
2. The method of Claim 1 wherein said sheet of hardfacing material consists essentially of from about 85 to about 99 percent, by volume of a solid particulate material substantially uniformly distributed in a matrix of from about 1 to about 15 percent by volume of fibrillated polytetrafluoroethylene resin, the fibrils of said polytetrafluoroethylene interconnecting and entrapping said particulate material to impart a self-sustaining condition and flexibility to said sheet.
3. The method of Claim 2 wherein said particulate material is an intermetallic abrasive material selected from the group con-sisting of carbides, nitrides, borides and silicides, or mixtures thereof.
4. The method of Claim 3 wherein said intermetallic abrasive material is a carbide selected from the group consisting of tungsten carbide, chromium carbide, tantalum carbide, titanium carbide, molybdenum carbide, silicon carbide, boron carbide, or mixtures thereof.
5. The method of Claim 1 wherein the brazing alloy is an al-loy selected from the group consisting of a nickel, cobalt or iron based alloys.
6. The method of Claim 1 wherein said brazing alloy is a nickel, cobalt, copper or silver based alloy.
7. The method of Claim 1 wherein the brazing material also functions as the hardfacing material.
8. The method of Claim 1 wherein the surface to be coated with said hardfacing material is first coated with a brazing alloy.
9. The method of Claim 1 wherein said brazing material is incorporated into said sheet of hardfacing material.
10. The method of Claim 1 wherein said brazing material is applied to said irregular surface as a separate sheet of material composed of particulate brazing material dispersed in a fibrillated polytetrafluoroethylene matrix.
11. The method of Claim 1 wherein said brazing material is applied to said irregular surface as a sheet of material which has been laminated to a sheet of hardfacing material composed of par-ticulate hardfacing material dispersed in a fibrillated poly-tetrafluoroethylene matrix.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47005283A | 1983-02-28 | 1983-02-28 | |
| US06/470,052 | 1983-02-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1228455A true CA1228455A (en) | 1987-10-27 |
Family
ID=23866072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000439351A Expired CA1228455A (en) | 1983-02-28 | 1983-10-20 | Method of applying a wear resistant and/or corrosion resistant coating to an article having an irregular surface |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS59193273A (en) |
| CA (1) | CA1228455A (en) |
| DE (1) | DE3406418A1 (en) |
| FR (1) | FR2541610A1 (en) |
| GB (1) | GB2135698B (en) |
| SE (1) | SE8305712L (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3419674A1 (en) * | 1983-05-26 | 1984-11-29 | Rolls-Royce Ltd., London | METHOD FOR APPLYING A COATING TO A COMPONENT |
| DE3508602A1 (en) * | 1985-03-11 | 1986-09-11 | Atilla Dipl.-Chem. Dr.-Ing. 4515 Bad Essen Akyol | METHOD FOR TREATING WEAR-RESISTANT LAYERS ON TOOLS OR DEVICES |
| US4624860A (en) * | 1985-10-15 | 1986-11-25 | Imperial Clevite Inc. | Method of applying a coating to a metal substrate using brazing material and flux |
| DE3708243A1 (en) * | 1987-03-13 | 1988-09-22 | Kloeckner Humboldt Deutz Ag | Method for local surface treatment |
| JPH01169099A (en) * | 1987-12-24 | 1989-07-04 | Jdc Corp | Casing for centrifugal projector |
| US6004683A (en) * | 1992-11-04 | 1999-12-21 | C. A. Patents, L.L.C. | Plural layered metal repair tape |
| AU6013494A (en) * | 1992-11-04 | 1994-06-08 | Coating Applications, Inc. | Metal repair tape |
| US5348215A (en) * | 1992-11-04 | 1994-09-20 | Kevin Rafferty | Method of bonding hard metal objects |
| US6164916A (en) * | 1998-11-02 | 2000-12-26 | General Electric Company | Method of applying wear-resistant materials to turbine blades, and turbine blades having wear-resistant materials |
| DE102006020101A1 (en) | 2006-04-29 | 2007-10-31 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Harmetall wear protection layers for soft and non-hardenable metals |
| US8708655B2 (en) | 2010-09-24 | 2014-04-29 | United Technologies Corporation | Blade for a gas turbine engine |
| JOP20200150A1 (en) * | 2011-04-06 | 2017-06-16 | Esco Group Llc | Hardfaced wearpart using brazing and associated method and assembly for manufacturing |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE201136C (en) * | ||||
| GB1049022A (en) * | 1963-04-10 | 1966-11-23 | Asahi Chemical Ind | Method for coating surfaces of material |
| US4194040A (en) * | 1969-04-23 | 1980-03-18 | Joseph A. Teti, Jr. | Article of fibrillated polytetrafluoroethylene containing high volumes of particulate material and methods of making and using same |
| US3876447A (en) * | 1973-06-22 | 1975-04-08 | Trw Inc | Method of applying hard-facing materials |
| US4049432A (en) * | 1976-09-30 | 1977-09-20 | The United States Of America As Represented By The United States Energy Research And Development Administration | High strength ferritic alloy-D53 |
| DE2848997C2 (en) * | 1978-11-11 | 1987-02-26 | Eickhorn, geb. Fischer, Annette, 5650 Solingen | Process for strengthening metal wear parts |
-
1983
- 1983-10-18 SE SE8305712A patent/SE8305712L/en not_active Application Discontinuation
- 1983-10-20 CA CA000439351A patent/CA1228455A/en not_active Expired
- 1983-11-18 GB GB08330833A patent/GB2135698B/en not_active Expired
- 1983-12-28 FR FR8320966A patent/FR2541610A1/en not_active Withdrawn
-
1984
- 1984-02-21 JP JP2970784A patent/JPS59193273A/en active Pending
- 1984-02-22 DE DE19843406418 patent/DE3406418A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE3406418A1 (en) | 1984-08-30 |
| GB8330833D0 (en) | 1983-12-29 |
| SE8305712D0 (en) | 1983-10-18 |
| JPS59193273A (en) | 1984-11-01 |
| GB2135698A (en) | 1984-09-05 |
| SE8305712L (en) | 1984-08-29 |
| FR2541610A1 (en) | 1984-08-31 |
| GB2135698B (en) | 1986-11-26 |
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| MKEX | Expiry |