FR2640009A1 - SURFACE-TREATED ROLLING OR BEARING CONTACT ELEMENT AND BEARING BEARING USING SAME - Google Patents

Abstract

A sliding or rolling contact element which is surface treated. According to the invention, it comprises a film of a reaction product of 0.05 to 0.5 mum in thickness, which has been produced by chemical treatment of the surface of the sliding or rolling contact element; this element has low friction property, low wear property, better load bearing ability and better galling resistance. The invention applies in particular to ball bearings.

Description

The present invention relates to a sliding contact element or

  which is surface-treated to reduce friction and wear between the contact surfaces of two elements in sliding or rolling contact with each other and to increase the bearing capacity of the load and resistance to seizing each of these two elements. It also relates to a rolling bearing employing the element of

rolling contact.

  In the normal lubrication of bearings, the coefficient of friction between two sliding contact surfaces or metal body rolling surfaces changes

  with the absolute viscosity of the oil used for lubricating

  cation, the load on the bearings and the speed of rotation between

  the two sliding or rolling contact surfaces.

  In full or full fluid lubrication o a

  thick film and continuous oil is formed at the interface

  be the two sliding or rolling contact surfaces.

  contact between the underlying surfaces of the two

  metal body will almost never take place so the coeffi-

  friction of the two sliding contact surfaces

  - or rolling is very small. In the lubrifica-

  combination, where the metal-to-metal contact partly takes place or in the boundary lubrication in which a film

  lubricating oil is interrupted to thereby provoke

  few plates where a metal-to-metal contact takes place, it is possible that a surface

  seizing sliding or rolling contact surfaces

  To lubricate, take place. In order to prevent this degradation

  various types of lubricant additives (such as a lubricity agent, an extreme pressure agent

anti-wear) were used.

  The interface between the contact surfaces of the two metal bodies is at a high temperature and a

  high pressure to be in good condition very reactive.

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  An additive to the lubricant organic compound with chlorine, sulfur or phosphorus such as paraffin

  chlorine, dibenzyl sulphide or triphosphate

  created) into the contact zone reacts easily

with a bearing metal.

  As a result of the reaction, inorganic compounds

  or organometallic with each element (such as a metal chloride, a metal sulfide, a metal phosphate etc ...) occur on the contact surfaces of the two metal bodies. The reaction products are believed to prevent galling and wear between the contact surfaces of two metal bodies. However, the immediate effect of the lubricant additive can only be anticipated because it takes a considerable time at the beginning

  of the reaction between the lubricant additive and the

  contact or friction surfaces of two metal bodies.

  In the prior art, there are some examples where a sliding or rolling contact element has

  previously treated on the surface with the lubricant additive

  like tricresyl phosphate (ie TCP).

  However, there is currently no established theory of the effect obtained if this sliding or rolling contact element has been previously treated on the surface by the lubricant additive, the effect of which can be estimated in a variable manner; In particular, this effect in serious condition o

  a supply of lubricating oil is frequently

  interrupted during the operation of the element

  slip or rolling contact has not been

  crit. Indeed, the thickness of a layer treated with

  of the additive to the lubricant formed on the sliding or rolling surface by the prior art is as thin as less than 0.05 μm by measuring by X-ray photoelectron spectroscopy (ie XPS, that one

  will describe later). The present inventors have

  killed a four-ball test at a very high speed to study the improvement of the lubrication property

  of a bearing because of such a thin layer treated with

  face. This high speed four-ball test is a kind of extreme pressure test essentially equal to ASTM D-2783. The rotational speed of the vertical shaft of a very high speed four-ball test device can be increased up to 20,000 rpm while that of a four-ball test device according to ASTM D-2783 can be increased up to 1770 rpm. The very high speed four-bead test revealed that the surface-treated layer was as thin as

  0.05 pm would not improve the property of extreme

  in particular in serious condition in which, for example, the supply of lubricating oil

is interrupted.

  Another surface treatment of the bearing metal with an inorganic compound, such as zinc phosphate

  or manganese phosphate, instead of the reaction product

  above mentioned lubricant additive, has been attempted. In this case, there is a problem that

  this inorganic compound causes corrosion of the surface

  these metal bearings. In addition, the thickness of the

  surface treatment of this inorganic product is

  less than 0.05 μm. The high-speed four-bead test applied to this surface-treated layer of the inorganic product revealed that the surface-treated layer of this inorganic product could not improve the

property of extreme pressure.

  Thus, the prior art can not reveal sufficiently

  effective thickness of the treated layer

  face formed on each of the two surfaces in contact, therefore a sufficient improvement of the property of

  lubrication caused by the surface treatment

  to the sliding or rolling contact element

is not obtained.

  This intention is intended to overcome the above problems. Its purpose is a sliding or rolling contact element and a rolling bearing having a low friction property, a low wear property, a bearing capacity of the

  load and resistance to seizing which are sufficient

improved.

  In order to achieve this goal, the surface of

  metal of the sliding or rolling contact element

  It is chemically treated so that a reaction product film of 0.05 μm is formed on the surface of the sliding or rolling contact element.

  0.5 μm thick. The film of the reaction product

  an inorganic and / or organometallic compound of sub-micron thickness which is produced by a chemical reaction between a chemically active organic compound and the metal surface of the contact element of the

  slip or rolling and which has a characteristic

  different from that of the mass or sub-body

  of the sliding or rolling contact element

  is lying. The film thickness of the reaction product is

  preferably between 0.05 μm and 0.3 μm and in particular

It is 0.1 pm.

  The film of the above reaction product mentions

  is made of at least one of the phosphorus compounds,

sulfur and chlorine.

  Indeed, the film of the reaction product is

  made of at least one of the inorganic and / or

  metal products that are produced by reactions between

  organic compounds (organophosphorus compounds,

  organosulfur compounds, organochlorine compounds and compounds

  organometal) and a metal of the sliding contact element

  or rolling. In particular, the film of the product

  The reaction is preferably produced from a reaction

  between a mixture of an organophosphorus compound and an organosulfur compound and the contact element of

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sliding or rolling.

  The reaction product film with the phosphorus element comprises the reaction product films which are produced by reactions between at least one of the esters, phosphite, phosphate esters and phosphorus esters.

  acid phate and the metal of the sliding contact element-

ment or turnover.

  The film of the reaction product with the sulfur element comprises the reaction product films produced by reactions between at least one of fats and oils.

  sulfurized olefin, mercaptans, sulphides, sulphox-

  and sulfones and the metal of the contact element of

sliding or rolling.

  the film of the reaction product with the chlorine element comprises the reaction product films obtained by reactions between the chlorinated paraffins and / or the chlorinated fats and oils and the metal of the element of chlorine.

  sliding or rolling contact.

  The film of the organometal reaction product

  with the organometal includes the reaction product films

  produced by reactions between at least one of dihydrocarbyl dithiophosphates, metal dihydrocarbyl dithiophosphates and metal salts of

  naphthenic material and the metal of the sliding contact

ment or turnover.

  A rolling bearing of the present invention has at least one of the retaining means, the inner and outer tracks and the rolling element which is made of

  rolling contact elements having various

  reaction product of the present invention.

  According to the present invention, at least one of the

  two contact surfaces of the sliding contact elements

  or rolling is subjected to chemical treatment.

  that it is formed on this surface of

  tact, a reaction product film of 0.05 μm to 0.5 μm

  thick. A contact element for sliding or rolling

  and a rolling bearing of the present invention have a low friction property, a low wear property and a load carrying capacity and the

  resistance to galling sufficiently improved.

  The invention will be better understood, and other purposes,

  characteristics, details and advantages of it

  will become clearer in the course of the description

  following diagram with reference to the schematic drawing.

  annexed tick given solely by way of example illustrating an embodiment of the invention, and in which: the single figure is a graph illustrating

  an example of a measurement of the film thickness of a film

  phosphorus-containing reaction flask with the phosphorus element of the present invention, the Ar + etching time being indicated on the abscissa and the atomic percentage on the ordinate. Hereinafter, the present invention will be described in detail. The film thickness of the reaction product is

  measured by a photoelectron spectrophotometer

  XPS (XPS) XPS transmits X-rays to a surface of a sample and analyzes the energy of a photoelectron that is emitted from the outer surface (approximately several tenths of a nanometer) to produce data. a surface element and the chemical state. Similarly, XPS measures the thickness of a film of the reaction product while an argon ion gun (Ar)

  sprays the surface of the sample, thus analyzing.

  the in-depth distribution of the film element of the

reaction duit.

  The figure is a graph illustrating an example

  measurement of the film thickness of the reaction product

  of the organophosphorus compound (such as tridecyl acid phosphate).

  reaction product (a) is defined in terms of the profile in

  foundry of the sample, taken by XPS immediately before

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  that the phosphorus content of the film of the reaction product is unchanged (as shown in the figure, an attack time per Ar + is 27 minutes). In this case, since the etch rate is 3 nm / min, the film thickness of the reaction product is about 0.8 μm (i.e.

27 min x 3 nm / min).

  Controls of the concentration of the compound in the solution, the temperature of the reaction and the duration of the reaction between a compound and the sliding or rolling contact element, made in response to the type of compound, may force adjust the thickness of the

  film of the reaction product as described above.

  The film of the reaction product was formed by a reaction between the contact-slip member or

  and at least one of an organophosphorus compound.

  phore, an organosulfur compound, an organo

  chlorine and an organometallic compound. The film of the

  The reaction product which is obtained by a reaction between the slip or rolling contact member and the organophosphorus compound is called the reaction product-organophosphorus compound film. The film of the product

  reaction which is obtained by a reaction between the

  sliding contact or rolling contact and the

  organosulfur is called the reaction product film-

  composed of organosulfur. The film of the reaction product which is obtained by a reaction between the slip or rolling contact element and the organochlorine compound

  is called the film of the reaction product-organo compound

  chlorine. The film of the reaction product which is obtained by a reaction between the sliding or rolling contact element and the organometallic compound is called the

  film of the reaction product of the organometallic compound.

  The organophosphorus compound used to produce the film of the reaction product-organophosphorus compound comprises phosphite esters, phosphate esters,

and acid phosphate esters.

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  Phosphite esters include phosphite esters derived from E1 to C18 hydrocarbyl groups such as alkyls, phenyls, benzyls, cresyls, cinnamyls and aryls. For example, trioctylphosphilate, triphenyl phosphite, tricresyl phosphite, bis-2-ethyl hexyl

  phosphate, tridecyl phosphite, dibutylhydrogen phosphate

  phite. the tris nonl pheni, 1 phosphite. dilauryl hydro-

  genophosphite, diphenyl monodecyl phosphite, triphenyl

  lauryltrithiophosphite and diphenylhydrogenophosphite

are preferable.

  Phosphate esters include esters

  of phosphates derived from C1 to C20 hydrocarbyl groups.

  For example, triphenylphosphate, triethylphosphate,

  phate. tributyl phosphate, tris (2-ethyl hexyl)

  phosphate, tridecyl phosphate, diphenyl mono-

  2-ethyl hexol phosphate, tricresyl phosphate,

  trioctyl phosphate, tristearyl phosphate are preferred

fold them.

  The esters of acid phosphates comprise mono- or dihydrocarbyl acid phosphates C to C20. By

1 1 20 '

  For example, methyl acid phosphate, isopropyl acid phosphate, butyl acid phosphate, 2-ethyl hexyl acid phosphate, isodecyl acid phosphate, tridecyl acid phosphate. the acid phosphate of

lauryl are preferred.

  The organosulfur compound used for

  the film of the reaction product

  sulfur includes fats and sulfurized oils (such as sulfurized spermacéti oil, sulfurized olefin),

  mercaptans, sulphides, sulphoxides and sulpho

  nes. Olefin sulphides include sulphides derived from C3 to C8 olefin sulphides or polyolefin sulphides

  low molecular weight derivatives of C3 to C8 olefins.

  For example, pentene sulphide, sulphide

  butylene and octene sulfide.

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  Mercaptans include alkyl mercaptans

  C4 to C20 tans and C4 to C20 fatty mercapto esters. For example, n-butyl mercaptan, isobutyl mercaptan,

  tertiary butyl mercaptan, n-octyl mercaptan,

  tertiary mercaptan nyl, tertiary dodecyl mercaptan, butyl thioglycolate, ethyl thiopropionate, and

  octyl 3-mercaptopropionate are preferable.

  The sulfides include monosulfides (-S-) with C4 to C20 hydrocarbyl groups, (S-S-) disulfides with C4 to C20 hydrocarbyl groups and

  polysulfides (-S-S-S-) with hydrocarbon groups

  the C4 to C20. For example, dibutyl monosulfufe, dibutyl disulfide, diphenyl sulfide and dibenzyl

sulphide are preferable.

  The sulfoxides include sulfoxides with

  C4 to C20 hydrocarbyl groups. For example, the dibu-

  Tyl sulfoxide and dibenzyl sulfoxide are preferable.

  The sulfones include sulfones with C4 to C20 hydrocarbyl groups. For example, dibutyl sulfone, didodecyl sulfone and phenyl sulfone are preferable. The organochlorine compound used to obtain the film of the reaction product-organochlor compound

  includes chlorinated paraffins and fats and oils

chlorinated.

  Chlorinated paraffins include, for example,

  n-octyl chloride, paraffin chloride, chlo-

  octadecyl chloride. Chlorinated fats and oils include

  For example, chlorinated spermaceti oil is used.

  The organometallic compound used to obtain the film of the reaction product-organometallic compound comprises metal dihydrocarbyl dithiophosphates,

  metal dihydrocarbyl dithiocarbonates and naphthalenes

metal thénates.

  Metal dihydrocarbyl dithiophosphates include the group of dihydrocarbyl dithiophosphates

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  of metal each of which includes one of the hydrocarbyl groups

  the C4 to C20. For example, zinc dimethyl dithiophosphate, zinc butyl isooctyl dithiophosphate,

  zinc di (4-methyl-2-pentyl) dithiophosphate, the di (tetra

  zinc propenyl phenol) dithiophosphate, (2-ethyl-1-

  zinc hexithium phosphate, isooctyl dithiophos-

  zinc phate, zinc (ethyl phenyl dithiophosphate,

  zinc amyl dithiophosphate, and dihexyl dithiophos-

  zinc phate. In addition to the above-mentioned dihydrocarbylated zinc dithiophosphates, the dihydrocarbyl dithiophosphates of

  lead (Pb, cadmium (Cd ', antimony óSb) and molyb-

dene (Mo 'are preferable.

  metal dihydrocarbyl dithiocarbamates include the group of dihydrocarbyl dithiocarbamates

  of metal each containing one of the hydrocarbon groups

  byles C4 to C2. For example, dimethyl dithiocarbamate

4 '

  zinc, zinc butyl isooctyl dithiocarbamate, zinc di (4-methyl-2-pentyl) dithiocarbamate, zinc di (tetrapropenyl phenyl), dithiocarbamate, zinc (2-ethyl-11-hexyl) dithiocarbamate, zinc isooctyl dithiocarbamate, zinc (ethylphenyl) dithiocarbamate, zinc dithiocarbamate and zinc dihexyl dithiocarbamate In addition to dithiocarbamates

  zinc dihydrocarbylates above, dihydro-

  carb (d) dithiocarbamates of lead (Pb), cadmium (Cd),

  of antimony (Sb) and molybdenum (Mo).

  Naphthenates include a salt of a metal

  of naphthenic acid. For example, naphthene is preferred.

nate of lead.

  The various compounds yielding the reaction product may be used directly or in a condition in which the compounds are dissolved in an oil or a solvent and diluted to a concentration range of 0.1 to 100% by weight. For example, refined paraffinic oil and diphenyl oil can be used as an oil and benzene, toluene,

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  hexane and the like can be used as solvents.

  Non-polar oils and solvents are preferred.

  In forming the reaction product film, the organophosphorus compound, the organosulfur compound, the organochlorine compound and the organometallic compound are

  that at a predetermined concentration may be used

  alone or mixed. In particular, it has been found that

  when the organophosphorus compound and the organophosphorus compound

  nosoufre are mixed, an interaction between them favor-

  the rate of formation of the film of the reaction product.

  In the same type of organophosphorus compound, organosulfur compound or organochlorine compound, corresponding specific organic compounds have been used.

separately or in combination.

  In response to the type and content of each of the specific organic compounds used separately or in combination, a film of a corresponding reaction product

  containing phosphorus, sulfur, chlorine, an or-

  -organic or at least two of these elements is formed at the

  surface of the sliding or rolling contact

LEMENT.

  The contact element for sliding or rolling

  The process to be treated is immersed in a solution of the organophosphorus compound, the organosulfur compound, the organochlorine compound, the organometallic compound or their mixture, the concentration of which is adjusted to the predetermined value above. The reaction between the metal of the sliding or rolling contact element and this organic compound takes place for a certain period of time, between 0.5 hours and 8 hours, so that the

  temperature of the reaction is controlled at a pre-

  determined between ambient temperature and 120 ° C. Thus, the film of the reaction product having a thickness of 0.05 μm to 0.5 μm is formed on the surface of the contact element of

  sliding or rolling. In other words, the concentration

* Treating the solution of this organic compound, the temperature

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  and the duration of the reaction between the metal of the sliding or rolling contact element and the solution of

  organic compound are controlled in such a way that the thick

  the film of the reaction product formed on the sliding or rolling contact element is between

0.05 μm and 0.5 μm.

  In the process of forming the film of the reaction product, the use of an ultrasonic wave in

  the condition of a predetermined temperature may improve

  the uniformity of the film of the reaction product and

  Maintaining the reaction rate between the metal of the slip or rolling contact element and the organic compound. The high speed four-bead test was applied to the surface-treated roll contact elements and reaction product films of various thicknesses had formed on their surface. When the thickness of each of the reaction product films was less than 0.05 μm and greater than 0.5 μm, the seizing between the surfaces of the rolling contact elements and an oscillation

  place. On the other hand, when the thickness of this film from

  The reaction mixture was between 0.05 μm and 0.5 μm and particularly preferably between 0.05 μm and 0.3 μm. The high-speed four-bead test revealed

  experimentally that very good results from the

  low friction tee, low wear property ,.

  the load carrying capacity and seizing resistance of the bearing contact element were

obtained.

  At least one sliding contact surface

  rolling element of the sliding contact

  or turnover may be subject to the treatment of

  this invention. Of course, other parts of the

  slip or rolling contact may also

  subject to the surface treatment of the pre-

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  this invention. When the contact area of at least

  one of the two sliding or rolling contact elements

  is subject to the surface treatment of the

  In the invention, a sufficient improvement is obtained in the low friction property, the low wear property, the load bearing capacity and the

resistance to seizure.

  Below are examples of the present invention. Example 1 12.7 mm diameter steel balls having respective six-layer reaction product films produced by a phosphate ester were prepared. Then, the very high speed four-bead test was applied to the bearing steel balls of Example 1. Tridecyl acid phosphate (i.e.

  a mixture of tridecyl monohydrate phosphate and phosphorus

  tridecyl diacid pest) having a high reactivity, a

  has been used as phosphate ester.

  Composition and physical properties (ie

  that is, the mechanical strength, adhesion, uniformity and lubricating property of each of the reaction product films depend on the chemical structure of the hydrocarbyl group of the acidic phosphate ester (R = C to C 2, this ester can be an aliphatic or aromatic compound or a mixture) and the concentration in the oil or a solvent. The thickness of each of the reaction product films depends on the temperature and the

  duration of surface treatment. Consequently, the conditions

  of the reaction between the bearing steel balls and tridecyl acid phosphate were determined taking into account the concentration, temperature and

  the duration of the surface treatment.

I4

  In Example 1, the steel balls were immersed in

  in a solution in which the tridecyl acid phosphate was diluted with a refined oil to a concentration of 5% by weight and reacted with the solution at 40 C for 4 hours so that a film of reaction product of about

  0.3 μm thick on the surfaces of the balls.

  Thus, the temperature and duration of the reaction were controlled so that reaction product films having thicknesses of 0.01 μm, 0.05 μm,

  0.1 μm, 0.3 μm, 0.5 μm and 0.8 μm are formed on the surface.

faces of the balls. respectively.

  Table I below shows the results of the very high speed four-ball test applied to

  samples that are surface treated.

  In example i, the speed of rotation was ac-

  raw up to the speed causing seizure at 1000 rpm at the oil temperature and load shown

in table 1.

TABLE 1

  Maximum Pressure Temperature Seizing Hertg Oil Hertg Unprocessed Turning Speed C GPa RPM

3.0 6000

0.01 um 120 3.0 7000

E I II

  0.05 pm 120 3.0 10000 0.1 pm 120 3.0 12500 0.3 1im 120.0 11000 0.5 pm 120 3.0 10000 0.8 w '120 3.0 Large oscillation i. The galling resistance of the bearing steel ball having a reaction product film of 0.1 μm thickness was substantially equal to that of the balance sheet.

  bearing steel untreated on the surface. The galling resistance of the bearing steel ball having the 0.8 μm thick reaction product film could not be

  measured because there was a big swing.

  In addition, resistance to seizure of

  one of the bearing steel balls having pro-

  The reaction temperature of 0.05 μm to 0.5 μm thick was considerably increased. In particular, the galling resistance of the bearing steel ball having a reaction product film of 0.1 μm thickness was the best. Example 2 Bearing steel balls having a diameter of 12.7 mm having respective films of the six-ply reaction products produced by the same phosphate ester

  than in Example 1, have been prepared. So, the test at

  very high speed beads was applied to the balls

of steel of Example 2.

  In Example 2, a supply of lubricating oil

  fication was interrupted. This interruption was effected

as follows:

  1 / - an interruption of one minute was made

  killed at the pv value of 5886 N / mm.mn / s in an oil bath

  whose temperature was 120 C.

  2 / - after a lapse of one minute, the lubricating oil of the oil bath was immediately exhausted and the time was measured until the presence of galling

  of the bearing steel ball. Table 2 which follows

  be the result of the test of four balls at very high speed.

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TABLE 2

Not treats Time to seizure

  -----_----------- r ------------------ ------ ------

  0'00 "0.01 um 0'40" 0.05 Tm 1 '40 "0.1 ium 3 '00" 0.3 m' 27 "0.5 pm 2'00" 0.8 μm | 1'00 "

  When the thickness of the reaction product film

  it is 0.8 mm, it has a large oscillation

  the operation of the high-speed four-ball test apparatus and the bearing steel ball suffers a great deal of friction. On the other hand, when the thickness of the reaction product film is 0.05 μm, the coefficient of friction of the ball is relatively low. Even in severe condition where it has been depleted of lubricating oil, it is apparent that the effect of each of the reaction product films formed on the surface of the steel ball is very advantageous. In particular, the galling resistance of the steel ball having the reaction product film of 0.1 μm thick is

the best.

Example 3

  Tapered rollers of steel from a roller bearing

  conical waters (outer diameter: 52 mm and inner diameter: mm before respective reaction product films

  various thicknesses, produced by the same phosphate ester

  phate than in Example 1, were prepared. then, the temperature rise of the bearing having each of the tapered rollers was measured under conditions of a radial load of 100 N, an axial load of 1500 N, a speed of rotation of 3000 rpm and very low oil content,

such as oil veneer.

  Table 3 below shows the results of the

  the conical bearing water of Example 3:

TABLE 3

  t Temperature increase of the path

external (C) -

  Untreated O 100 0.01 μm 98 0.1 μm 60 0.3 μm 72 μm 0.8 0.8 μm large oscillation It is apparent that the temperature increase of each of the conical rolls having the reaction product of 0.1 μm to 0.5 μm in thickness is about 30 to 40 ° C lower than for the untreated conical roll and the tapered rolls having reaction product films of 0.1 μm and 0, 8 Pm. In particular, the increase in temperature of the conical roll having the reaction product film of 0.1 μm thickness was the best to reflect the low friction of the reaction product film of 0.1 μm thick. Such results have also been

obtained on a ball bearing.

I8

Example 4

  Zinc hydrocarbyl dithiophosphate

  holding 20.7% sulfur in its molecule was diluted in a refined oil to have a concentration of 1% by weight. Steel ball with a diameter of 12.7 mm has

  was immersed in this solution of hydrocarbyl dithio-

  zinc phosphate and reacted at 120 C during

  24 hours. Thus, a reaction product film was produced.

0.1 μm thick.

  The time until the presence of seizure has been

  measured on the sample thus produced, in the same way

  than in Example 2. This measure gave a

  until there is seizure of the l0 ".

Example 5

  Tertiary octyl disulfide, a disulfide

  containing two sulfur in its molecule, is diluted

  in a refined oil so as to have a concentration

  50% by weight. The 12.7 mm diameter steel ball was immersed in the tertiary octyl disulfide solution and reacted at 600 ° C. for 30 minutes.

  4 hours. Thus, a film of the reaction product was formed.

  0.1 μm thick on the surface of the ball

  of 12.7 mm steel. The period of time up to the pre-

  Seizure was measured on the sample thus produced, under the same conditions as in Example 2. This measurement gave a time until the presence of seizure

1'30 ".

Example 6

  N-octyl chloride was diluted with a refined oil in order to have a concentration of 50%

  weight. The 12.7 mm thick steel ball was im-

  merged into this solution of n-octyl chloride and it was

  reacted at 60 ° C. for 4 hours. Thus, the film of the

  a reaction thickness of 0.1 μm thick was formed at

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  12.7 mm steel ball surface. The time until a seizure was measured was measured on the sample

  thus produced, under the same conditions as in Example 2.

  This measure gave a time until the presence of

page of 1'35 ".

Example 7

  As it was found that the organosulfur compound

  and the organophosphorus compound acted with each other.

  and a film formation reaction of the reaction product was favored, the 12.7 mm bearing steel ball was immersed in a mixture of a solution.

  5% by weight of trioctyl phosphate, 4% wt.

  tridecyl acid phage constituting a kind of phosphoric acid and 5% by weight of di-tert-octyl disulfide and reacted at 60 ° C. for 2 hours. Thus, the reaction product film 0.1 μm thick formed on the surface of the 12.7 mm steel ball. We have

  measured the period of time until the presence of a grip-

  page on the sample thus produced, in the same

  than in Example 2. This measurement gave a time until the seizure was 30'20 ".

  is better than that of Example 2.

  Example 7 reveals that even when mixing different organic compounds to form the reaction product film on the surface of the sample, the sliding or rolling contact member with

  this film has good resistance to seizure.

  The surface treatment of the present invention is applied not only to the ball or roll of the

  rolling bearing but also for example

  these gorges the internal and external paths and to the

  bearing retaining surface. A rolling bearing

  taking at least one of the two elements has a very good

  load carrying capacity and very good resistance

  to seizure, and can therefore be used even in

  drying o a supply of lubricating oil

  tion is interrupted during the operation of the

rolling.

Z640U09

Claims (16)

R E V E N D I C A T I 0 N S   1. Sliding or rolling contact element   treated surface, characterized in that it comprises:   a film of a reaction product of a thickness   from 0.05 μm to 0.5 μm which has been produced by chemical treatment of the surface of a sliding contact element. ment or turnover.   2. Element according to claim 1, characterized in that the thickness of said film of the reaction product   is between 0.05 Hm and 0.3 pm.   3. Element according to revendicatin 1, characterized in that the thickness of the film of the reaction product is 0.1 pm.   4. Element according to claim 1, characterized in that the film of the reaction product is made of at least one of a metal phosphate, a sulfide of metal and a metal chloride.   5. Element according to claim 1, characterized in that the reaction product film comprises at least one of a film of a reaction product-organophosphorus compound, film of a reaction product composed of organosulfur, film of a reaction product-an organochlorine compound and a film of a reaction product-organometallic compound wherein the slip or rolling contact element has reacted with a corresponding compound of an organophosphorus compound, an organosulfur compound,   an organochlorine compound and an organometallic compound.   6. Element according to claim 5, characterized in that the film of the reaction product comprises a film of the reaction product in which the sliding contact element or rolling contact reacts with a mixture of   organophosphorus compound or oganosulfur compound.   Element according to claim 5, characterized   in that the film of the reaction product-organo compound   phosphor comprises a reaction product film for which the sliding or rolling contact element   reacts with at least one of phosphite esters.   phosphate esters and acid phosphate esters.   Element according to claim 7, characterized   in that the film of the reaction product-organo compound   phosphorus comprises a reaction product in which the sliding or rolling contact element reacts   with tridecyl acid phosphate.   Element according to claim 5, characterized   in that the film of the reaction product-organo compound   sulfur comprises a reaction product film where the   slip or rolling contact reacts with at least one of sulfurized fats and oils, sulfurized olefins, mercaptans, sulphides, sulfoxides and sulfones.   Element according to claim 9, characterized   in that the film of the reaction product-organo compound   sulfur comprises a reaction product film where the slip or rolling contact element reacts   with di-tert-octyl disulfide.   11. Element according to claim 5, characterized in that the film of the reaction product - organochlorine compound comprises a film of the reaction product o the slip or rolling contact element reacted with chlorinated paraffins and / or greases. and chlorinated oils.   Element according to claim 11, characterized   in that the film of the reaction product-organo compound   chlorine comprises a reaction product film where the   slip or rolling contact has reacted with n-octyl chloride.   Element according to claim 5, characterized   in that the film of the reaction product-organic compound   metal comprises a film of the reaction product o the sliding or rolling contact element has reacted ú640009   at least with one of dihydridarbyI dithiophosphates of   metal, dihydrocarbyl dithiocarbamates of metal and naphtha metal thénate.   14. Element according to claim 13, characterized in that the film of the reaction product-organometallic compound comprises a film of the reaction product o the sliding contact element or rolling reacted   with zinc dithiocarbyl dithiophosphate.   15. Element according to claim 6, characterized in that the film of the reaction product comprises a film   of reaction product o the sliding contact element   ment or rolling reacted with a mixture of phosphate   tridecyl acid and dedi-tert-octyl disulfide.   16. Bearing unit characterized in that at least one of an internal and external path retaining means and a rolling element of said bearing is made of an element.   rolling contact according to any one of the previous statements.