Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D7/00—Modifying the physical properties of iron or steel by deformation
  • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
  • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
• • 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
  • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
  • C23C8/02—Pretreatment of the material to be coated
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/02—Parts of sliding-contact bearings
  • F16C33/04—Brasses; Bushes; Linings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49636—Process for making bearing or component thereof
  • Y10T29/49709—Specific metallic composition

Definitions

• the invention relates to methods for producing friction elements especially resistant to wear by abrasion.
• Said patent discloses a method for producing metallic parts in rubbing frictional contact and having a high resistance to seizure and to wear by friction with no or doubtful lubrication, wherein the parts are made from a metallic material chosen from the group of metals capable of hardening by cold-hammering while exhibiting in its superficial crystalline structure a high density of planes of shear, and consisting of austenitic stainless steels, hypereutectoid alloy steels containing at least 11% by Weight of manganese, titanium and titanium alloys containing a major part of titanium, are subjected to a deep cold-hardening executed in such manner that it produces, on the surface of the part, striations substantially perpendicular to the direction of the friction.
• the part is subjected to the superficial incorporation of at least one element chosen from the group of the metalloids and transition metals, which metalloids and transition metals possess one of the two properties consisting firstly in the capacity of depositing at the surface of the parts an ionic compound by reaction with the underlying metal, and secondly of the capacity of inserting its atoms into the structure of the underlying metal while forming a solid insertion solution.
• the metalloid group consists of nitrogen, carbon and sulphur and the transition metal group of selenium and tellurium.
• the superficial incorporation is obtained by maintaining a contact during a period comprised between 1 and 6 hours at a temperature from 400 to 590 C. between said part and a fiuid such as a salt bath or a gaseous atmosphere, which contains the element to be incorporated.
• said deep cold-hardening may be effected by hammering with a striated hammer or by knurling.
• the parts in the case where the element is sulphur, the parts may be subjected to a thermal treatment of at least two hours in a sulphurizing bath or a sulphurizing atmosphere at a temperature higher than 500 C.
• a treatment of this kind can for example be applied by means of a process known in France under the commercial name of Sulfinuz.
• all the identical or similar processes using salt baths or a gaseous medium producing superficial structure layers of compositions similar or identical with those which are obtained by the Sulfinuz process may be employed.
• the parts are pre heated to about 300 to 350 C. and are then immersed for a period of 2 to 6 hours in a salt bath maintained at an approximate temperature of 570 C. and are composed of an inactive base such as the alkali and alkaline-earth chlorides and carbonates, permitting a melting point to be obtained of less than 500 C. of sulphur compounds, the action of which is preponderant and buffer cyanides or cyanates which protect the sulphur compounds by keeping the bath in a reducing medium.
• an inactive base such as the alkali and alkaline-earth chlorides and carbonates
• the treatment temperature in salt baths or in a gaseous atmosphere may, depending on the composition of the bath, for example when it contains a sulphide and a ferro-cyanide, be less than 570 C., the sulphuretting action being then capable of taking place from 400 C.
• the said incorporation may be obtained by means of any nitriding process which is effective below a maximum temperature of 580 C. It is also possible to make use of the process known by the commercial name of Tenifer or of all identical or similar processes using salt baths or gaseous media producing superficial layers of structures and of compositions similar or identical to those which are obtained by the Tenifer process.
• Tuiftride is a process of mild nitridation which makes it possible to obtain on the steel parts, an outer layer comprising iron carbide and iron nitride covering a diffusion layer of nitrogen in the steel.
• This result can be obtained for example by immersing the part for a sufiicient pre-determined period, for example for two hours, in a salt bath heated to a temperature comprised between 550 and 580 C., for example 565 C., comprising about 32 to 35% of alkali cyanates, for example 45% of potassium cyanate, and 50 to 55% approx. of alkali cyanides, for example 55% of potassium cyanide, the bath being stirred by blowing-in air.
• the cold hardened parts can advantageously be successively subjected to a nitridation such as the Tenifer treatment and then to a sulphurizing treatment, for example according to the Sulfinuz process.
• a nitridation such as the Tenifer treatment
• a sulphurizing treatment for example according to the Sulfinuz process.
• the other part being a bushing formed by rolling a metal sheet submitted to a laminating, said laminating and said rolling being carried out with a pressure sufficient to give the metal of said bushing a superficial micro-hardness superior to about 450 Vickers for a charge of about 50 g. and at a depth of about 0.005 mm.
• the metal of said journal as well as of the sheet will be a hypereutectoid steel containing at least 11% of manganese, commonly known as Hadfield stee What is claimed is:
• a method for producing metallic parts in rubbing frictional contact and having a high resistance to seizure and to wear by friction wherein the parts are made from a metallic material chosen from the group of metals capable of hardening by cold-hammering while exhibiting in its superficial crystalline structure a high density of planes of shear, and consisting of austenitic stainless steels, hyper-eutectoid alloy steels containing at least 11% by weight of manganese, titanium and titanium alloys containing a major part of titanium, one of the parts being a journal subjected to a deep cold-hardening executed in such manner that it produces, on the surface of the part, striations substantially perpendicular to the direction of the friction, following which the part is subjected to the superficial incorporation of at least one element chosen from the group of the metalloids and transition metals, which metalloids and transition metals possess one of the two properties consisting firstly in the capacity of depositing at the surface of the parts an ionic compound by reaction with the underlying metal, and
• the other part being a bushing formed by rolling a metal sheet submitted to a laminating, said laminating and said rolling being carried out with a pressure sufficient to give the metal of said bushing a superficial microhardeness superior to about 450 Vickers for a charge of about g. and at a depth of about 0.005 mm.
• journal is subjected to a treatment for at least two hours in a sulphurizing bath at a temperature of at least 400 C.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Crystallography & Structural Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Sliding-Contact Bearings (AREA)
• Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=8635952

Family Applications (1)

Country Status (4)

Cited By (7)

Families Citing this family (1)

Citations (2)

• 1968
  • 1968-06-14 BE BE716636D patent/BE716636A/xx unknown
  • 1968-06-14 US US736978A patent/US3535169A/en not_active Expired - Lifetime
  • 1968-06-26 DE DE1758550A patent/DE1758550C3/de not_active Expired
  • 1968-07-17 LU LU56513D patent/LU56513A1/xx unknown

Patent Citations (2)

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