| Patents for C23C 8 - 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 (10,951) |
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| 06/11/1991 | US5022933 Process for annealing boron-containing steels and product thereof |
| 06/06/1991 | DE3939809A1 Wood working tool mfg. - has additional hard layer applied after hardening |
| 06/05/1991 | EP0429501A1 Device for plasma processing with an anode |
| 05/29/1991 | EP0428787A1 Industrial vacuum furnace |
| 05/29/1991 | CN1012685B Method for forming black oxidized film on the surface of a sheet metal |
| 05/28/1991 | US5019182 Method of forming hard steels by case hardening, shot-peening and aging without tempering |
| 05/22/1991 | EP0427853A1 Metal oxidation apparatus and method |
| 05/22/1991 | CN1051589A Precipilation intensification treating process of ionic nitrided piece |
| 05/16/1991 | DE3937699A1 Producing epsilon carbonitride coatings on ferrous components - by controlling gas mixt. compsn. with respect to nitriding and carburising indices required to produce predetermined coating compsn. |
| 05/15/1991 | CN1051398A Treating aluminum workpieces |
| 05/07/1991 | US5013371 Method of nitriding steel |
| 05/02/1991 | EP0425471A1 Cold work tool steel with high compression strength and use of these steels |
| 05/01/1991 | CN1012506B Process for long-term antirust of silicon sheet core |
| 04/30/1991 | US5011529 Cured surfaces and a process of curing |
| 04/24/1991 | EP0424211A1 Method of plasma surface treatment of metallurgical products |
| 04/24/1991 | EP0423946A1 Improvements in or relating to the manufacture of metal/fibre composites |
| 04/23/1991 | US5009963 Metal material with film passivated by fluorination and apparatus composed of the metal material |
| 04/23/1991 | US5009000 Overcoating steel plunger with boronized case; heating; quenching |
| 04/18/1991 | CA2027703A1 Process for the surface treatment of steel products by the action of a plasma |
| 04/16/1991 | US5008132 Process for preparing titanium nitride coated silicon carbide materials |
| 04/10/1991 | EP0421868A1 Superficial oxidation of a piece of passive metal and combustible assembling elements of a metallic alloy coated with a protective oxide |
| 04/10/1991 | EP0421236A1 Process for the nitrocarburizing of steel pieces |
| 04/04/1991 | WO1991004351A1 Process for protective finishing of ferrous workpieces |
| 04/04/1991 | WO1991004350A1 Stainless steel material for use in clean system |
| 04/03/1991 | EP0419675A1 Sticker for preventing carburization, nitridation or oxidation, and method of preventing carburization, nitridation or oxidation |
| 04/03/1991 | CN1050343A Method for generation of coated or osmosized layer on cast part with coated layer on casting mould |
| 04/02/1991 | US5003919 Apparatus for stabilization treatment of ferromagnetic metal powder |
| 03/27/1991 | WO1991005071A1 Oxidation treatment apparatus for metal pipes |
| 03/27/1991 | CN1050135A Dental high speed worm gear lathing needle and the making method thereof |
| 03/27/1991 | CA2067095A1 Oxidation treatment apparatus for metal pipes |
| 03/26/1991 | US5002009 Furnace for formation of black oxide film on the surface of thin metal sheet and method for formation of black oxide film on the surface of shadow mask material by use of said furnace |
| 03/23/1991 | WO1991004349A1 Process for continuously coating metal with titanium oxide and equipement therefor |
| 03/23/1991 | CA2041662A1 Process for continuously coating metal with titanium oxide and equipment therefor |
| 03/20/1991 | EP0417780A2 Method and device for evaporating an arc discharge cathode with cathode spots with reduced macroparticle emission |
| 03/20/1991 | EP0393137A4 Carburized low silicon steel article and process |
| 03/20/1991 | CN1050050A Process of surface compounding of steel neckband of fine spinning machine |
| 03/20/1991 | CN1050049A High concentration carburizing of steel with low carbon and high chromium content |
| 03/19/1991 | US5001001 Infiltration of reactive gases into compacted metal powder body, then exposure to laser for heating, cooling |
| 03/19/1991 | US5000785 Method for controlling the oxygen content in agglomerated molybdenum powders |
| 03/13/1991 | EP0416947A1 Boronized sliding material and method for producing the same |
| 03/13/1991 | CN1049869A Quick-acting gaseous combined cementation process of carbon and other elements |
| 03/12/1991 | US4999052 Thermally dissociating a nitrogen donor in steel particles to provide nitrogen in solid solution |
| 03/12/1991 | CA1281266C Fast and homogeneous case hardening of a batch in a kiln |
| 03/07/1991 | WO1991002695A1 Gas mixture for thermo-chemical treatment of metals and alloys and method of obtaining it |
| 02/21/1991 | DE4033706A1 Raising corrosion resistance of surface layer of stainless steel - with low carbon content by diffusion of nitrogen, useful for treatment of tools for food |
| 02/20/1991 | CN1011710B Liquid boron-aluminium co-permeation method |
| 02/19/1991 | US4993150 Process for producing cup tappets for reciprocating-piston machines |
| 02/12/1991 | US4992309 Immersion of metal into nitriding bath |
| 02/07/1991 | DE4002513C1 Modifying surface of membrane for e.g. dialysis - by coating with mono:functional polymer contg. at least one hydrophilic chain |
| 02/06/1991 | EP0411244A1 Wear-resistant coating and method for its preparation |
| 02/05/1991 | US4989840 Controlling high humidity atmospheres in furnace main body |
| 01/30/1991 | CN1048895A Iron plating nitridation |
| 01/29/1991 | US4988575 Method of providing titanium and alloys thereof with a protective coating |
| 01/24/1991 | WO1991000929A1 Process for case-hardening roller bearing components of low-alloy nickel steel |
| 01/23/1991 | EP0409451A1 Process for depositing optical thin films on both planar and non-planar substrates |
| 01/23/1991 | CN1048731A Method of nitriding steels |
| 01/22/1991 | US4986750 Furnace |
| 01/19/1991 | CA2021367A1 Process for depositing optical thin films on both planar and non-planar substrates |
| 01/16/1991 | EP0408535A1 Multi-oxide coated carbide body and method of producing the same |
| 01/16/1991 | EP0408511A1 Process and apparatus for thermal or thermochemical treatment of steel |
| 01/16/1991 | EP0408168A1 Method of pretreating metallic works and method of nitriding steel |
| 01/10/1991 | WO1991000367A1 Carburising treatment of a steel with reduction of the hydrogen content in the carburized layer |
| 01/09/1991 | EP0407349A2 Electrode for use in electrolytic processes and process for manufacturing it |
| 01/01/1991 | US4981839 Method of forming superconducting oxide films using zone annealing |
| 12/31/1990 | CA2018670A1 Metal substrate of improved surface morphology |
| 12/27/1990 | EP0403564A1 Method of producing case-hardened plate armor |
| 12/27/1990 | CA1278173C Process for adhering an oxide coating on a cobalt- enriched zone, and articles made from said process |
| 12/26/1990 | CN2068100U Drip mechanism of gas carburize automatic control system |
| 12/25/1990 | US4979998 Process for forming a metal boride coating on a carbonaceous substrate |
| 12/25/1990 | US4979997 Heating, cold rolling, hot rolling, decarburization, and annealing |
| 12/25/1990 | US4979996 Low temerpature heating, nitriding runnign strip |
| 12/18/1990 | CA1277893C Shallow case hardening and corrosion inhibition process |
| 12/12/1990 | CN1010789B Complex carburizer |
| 12/11/1990 | US4977303 Coating, heating, diffusion |
| 12/05/1990 | EP0401164A1 Method for controlling a thermal treatment with carbon diffusion |
| 12/05/1990 | EP0400549A2 Process for producing grainoriented electrical steel sheet having superior magnetic and surface film characteristics |
| 12/05/1990 | CN1010698B Direct generation type controllable atmosphere carburization technology |
| 12/04/1990 | US4975147 Method of pretreating metallic works |
| 12/04/1990 | US4975128 Method for heat-treating straight bead welded pipes |
| 12/04/1990 | CA1277214C Heat treatment process, hood used in said process, and role of the latter in heat treating ovens |
| 11/22/1990 | EP0397729A1 Ion-nitrided cermet tip and method for producing the same |
| 11/20/1990 | US4971634 Method of carburizing spheroidizing and quenching |
| 11/15/1990 | WO1990013919A1 Production of high temperature superconducting materials |
| 11/14/1990 | CN1010418B Automated flexible installation for rapid thermochemical treatment |
| 11/13/1990 | US4969960 Method for increasing the resistance to thermal shocks in heating conductor materials |
| 11/13/1990 | US4969378 Case hardened roller cutter for a rotary drill bit and method of making |
| 11/07/1990 | CN1046789A Axle of electric immersible pump for oil extraction |
| 10/31/1990 | EP0394964A2 Colored zinc powder, its method of production and method for producing colored article |
| 10/31/1990 | CN1046566A Process for colouring surface of metallic materials and products obtained by its use |
| 10/24/1990 | EP0394159A1 Coloration process for a metallic material surface and products obtained from the process |
| 10/24/1990 | EP0393581A2 Ferritic stainless steel coated with a blade-like Oxide, and its manufacturing process |
| 10/24/1990 | EP0393137A1 Carburized low silicon steel article and process. |
| 10/18/1990 | WO1990012124A1 Sticker for preventing carburization, nitridation or oxidation, and method of preventing carburization, nitridation or oxidation |
| 10/18/1990 | CA2014692A1 Metallic material surface coloring process and products thereof |
| 10/17/1990 | EP0392850A2 Method of producing laminated metal belt |
| 10/17/1990 | EP0392134A2 Process for treatment of backside of semiconductor wafer |
| 10/17/1990 | CN1046196A Quick thermal treatment process of tooth palm of drill toothed wheel |
| 10/10/1990 | EP0391701A1 Sliding machine component with soft-nitrided surface layer |
| 10/10/1990 | CN1045996A Chemical thermal treatment by several times and short cycle method |
| 10/09/1990 | US4962049 Controlled spacing of surface from cathode; confined plasma forms protective oxide coating |