US4368107A
Expired / Lapsed
US
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Method of surface treatment of porous material
Assignee: Fujikura Cable Works Ltd
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Filing: 1981-06-11
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Granted: 1983-01-11
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Expires: 2001-06-11
Abstract
Abstract A method of the surface treatment of a porous material which comprises the step of electrolyzing the porous material in an electrolytic bath composed of an aqueous solution of at least one salt selected from the group consisting of alkali metal thiotungstate, alkali metal thioantimonate, alkali metal thiostannate, alkali metal thiocuprate, alkali metal thioarsenate, alkali metal thioaurate, alkali metal thioplatinate, alkali metal thioniobate, alkali metal thiovanadate, alkaline earth metal thiotungstate, alkaline earth metal thioantimonate, alkaline earth metal thiostannate, alkaline earth metal thiocuprate, alkaline earth metal thioarsenate, alkaline earth metal thioaurate, alkaline earth metal thioplatinate, alkaline earth metal thioniobate, alkaline earth metal thiovanadate, ammonium thiotungstate, ammonium thioantimonate, ammonium thiostannate, ammonium thiocuprate, ammonium thioarsenate, ammonium thioaurate, ammonium thioplatinate, ammonium thioniobate and ammonium thiovanadate, to thereby impregnate the porous material with the metallic sulfide. Optionally, the porous material may be immersed alternately in an aqueous solution prepared as described above for the electrolytic bath and an acid aqueous solution after the electrolysis to further impregnate the porous material with the metallic sulfide.
Inventors
- 👤 Masatsugu Maejima
- 👤 Koichi Saruwatari
- 👤 Kazuo Isawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:05
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D5/00; C25D5/48; C25D9/00; C25D9/04; C25D9/06
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
131 words
A method of the surface treatment of a porous material which comprises the step of electrolyzing the porous material in an electrolytic bath composed of an aqueous solution of at least one salt selected from the group consisting of alkali metal thiotungstate, alkali metal thioantimonate, alkali metal thiostannate, alkali metal thiocuprate, alkali metal thioarsenate, alkali metal thioaurate, alkali metal thioplatinate, alkali metal thioniobate, alkali metal thiovanadate, alkaline earth metal thiotungstate, alkaline earth metal thioantimonate, alkaline earth metal thiostannate, alkaline earth metal thiocuprate, alkaline earth metal thioarsenate, alkaline earth metal thioaurate, alkaline earth metal thioplatinate, alkaline earth metal thioniobate, alkaline earth metal thiovanadate, ammonium thiotungstate, ammonium thioantimonate, ammonium thiostannate, ammonium thiocuprate, ammonium thioarsenate, ammonium thioaurate, ammonium thioplatinate, ammonium thioniobate and ammonium thiovanadate, to thereby impregnate the porous material with the metallic sulfide.
Claim 2
Independent Claim
131 words
A method of the surface treatment of a porous material which comprises the step of electrolyzing the porous material in an electrolytic bath composed of an aqueous solution of at least one salt selected from the group consisting of alkali metal thiotungstate, alkali metal thioantimonate, alkali metal thiostannate, alkali metal thiocuprate, alkali metal thioarsenate, alkali metal thioaurate, alkali metal thioplatinate, alkali metal thioniobate, alkali metal thiovanadate, alkaline earth metal thiotungstate, alkaline earth metal thioantimonate, alkaline earth metal thiostannate, alkaline earth metal thiocuprate, alkaline earth metal thioarsenate, alkaline earth metal thioaurate, alkaline earth metal thioplatinate, alkaline earth metal thioniobate, alkaline earth metal thiovanadate, ammonium thiotungstate, ammonium thioantimonate, ammonium thiostannate, ammonium thiocuprate, ammonium thioarsenate, ammonium thioaurate, ammonium thioplatinate, ammonium thioniobate and ammonium thiovanadate, to thereby impregnate the porous material with the metallic sulfide.
Claim 3
Dependent Claim
51 words
A method according to claim 1, in which after the electrolysis, the porous material is immersed alternately in an aqueous solution of at least one metal salt of thio-acid prepared as described above for the electrolytic bath and an acid aqueous solution to impregnate the porous material with the metallic sulfide.
Claim 4
Dependent Claim
24 words
A method according to claim 1 or claim 2, in which the porous material is subjected to a heat treatment at a final stage.
Claim 5
Dependent Claim
73 words
A method according to claim 1 or 2, in which the porous material is a sintered metal, a metal product with an anodic oxide film, a porous chromium plated or microcrack plated metal, a ceramic or plastic material treated by a porous chromium plating or a microcrack plating after subjected to an electroless plating, an aluminium composite containing lubricating particles, or an aluminium alloy containing lubricating material and having an anodic oxide film.
Claim 6
Dependent Claim
24 words
A method according to claim 4, in which said lubricating particles are MoS 2 , WS 2 , PbS, graphite, graphite fluoride or BN.
Claim 7
Dependent Claim
17 words
A method according to claim 4, in which said lubricating material is Mo, W, Pb or Sn.
Claim 8
Dependent Claim
27 words
A method according to claim 1 or claim 2, in which before the electrolysis, the porous material is immersed in an acid aqueous solution as a pretreatment.
Claim 9
Dependent Claim
27 words
A method according to claim 1 or claim 2, in which before the electrolysis, the porous material is immersed in an alkaline aqueous solution as a pretreatment.
Claim 10
Dependent Claim
76 words
A method according to claim 1 or claim 2, in which before the electrolysis, the porous material is additionally electrolyzed as a pretreatment in an aqueous solution of at least one salt of metal selected from the group of nickel, tin, copper, manganese, cadmium, titanium, chronium, zinc, silver, gold and vanadium, or in an aqueous solution of at least one salt of oxyacid selected from the group consisting of molybdic acid, tungstic acid and stannic acid.
Claim 11
Dependent Claim
28 words
A method according to claim 1 or claim 2, in which before the electrolysis, the pores in the surface of the porous material are enlarged as a pretreatment.
Claim 12
Dependent Claim
34 words
A method according to claim 10, in which the enlarging treatment is carried out by electrolyzing the porous material by D.C. in an alkaline aqueous solution, the porous material serving as the negative electrode.
Claim 13
Dependent Claim
16 words
A method according to claim 10, in which the enlarging treatment is carried out by honing.
Claim 14
Dependent Claim
23 words
A method according to claim 10, in which the enlarging treatment is carried by subjecting the porous material to subatmospheric pressure or vacuum.
Claim 15
Dependent Claim
39 words
A method according to claim 1 or claim 2, in which the porous material is a metal product having an anodic oxide film, the pores in the anodic film being reduced in size as a pretreatment before the electrolysis.
Claim 16
Dependent Claim
25 words
A method according to claim 14, in which the size-reducing treatment is carried out by immersing the porous material in hot or boiled desalted water.
Claim 17
Dependent Claim
25 words
A method according to claim 15, in which at least one of nickel acetate, bichromate and silicate of soda is dissolved in the desalted water.
Claim 18
Dependent Claim
17 words
A method according to claim 15, in which an organic dye is dissolved in the desalted water.
Claim 19
Dependent Claim
28 words
A method according to claim 14, in which the size-reducing treatment is carried out by subjecting the metal product with the anodic oxide film to steam under pressure.
Claim 20
Dependent Claim
23 words
A method according to claim 1 or claim 2, in which the porous material is dyed by an organic dye as a pretreatment.
Claim 21
Dependent Claim
24 words
A method according to claim 3, in which the heat treatment is carried out at 200° to 800° C. in the absence of oxygen.
Claim 22
Dependent Claim
32 words
A method according to claim 1 or claim 2, in which after the porous material is impregnated with the metallic sulfide, the porous material is subjected to a drying and dehydrating treatment.
Claim 23
Dependent Claim
29 words
A method according to claim 1 or claim 2, in which after the porous material is impregnated with the metallic sulfide, the porous material is treated by lubricating material.
Claim 24
Dependent Claim
14 words
A method according to claim 22, in which the lubricating material is fatty acids.
Claim 25
Dependent Claim
14 words
A method according to claim 22, in which the lubricating material is lubricating oils.
Claim 26
Dependent Claim
14 words
A method according to claim 22, in which the lubricating material is solid lubricant.
Claim 27
Dependent Claim
25 words
A method according to claim 25, in which the solid lubricant is fine powder of MoS 2 , WS 2 , graphite, BN or polyfluoroethylene.
Claim 28
Dependent Claim
33 words
A method according to claim 1 or claim 2, in which after the porous material is impregnated with the metallic sulfide, the surface of the porous material is subjected to a grinding treatment.
Claim 29
Dependent Claim
33 words
A method according to claim 1 or claim 2, in which after the porous material is impregnated with the metallic sulfide, the surface of the porous material is subjected to a rubbing treatment.
Claim 30
Dependent Claim
23 words
A method according to claim 27, in which the grinding treatment is carried out by a buff, a grinding stone or a cutter.
Claim 31
Dependent Claim
23 words
A method according to claim 1 or claim 2, in which the concentration of the electrolytic bath is 0.01 to 30% by weight.
Claim 32
Dependent Claim
27 words
A method according to claim 30, in which a water-soluble organic solvent or a surface active agent is added to the electrolytic bath or the immersion solution.
Claim 33
Dependent Claim
24 words
A method according to claim 2, in which the acid aqueous solution is an aqueous solution of inorganic acid, organic acid or salt thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |