US3770512A - Method for surface hardening steel and cemented carbides - Google Patents
Method for surface hardening steel and cemented carbides Download PDFInfo
- Publication number
- US3770512A US3770512A US00165948A US3770512DA US3770512A US 3770512 A US3770512 A US 3770512A US 00165948 A US00165948 A US 00165948A US 3770512D A US3770512D A US 3770512DA US 3770512 A US3770512 A US 3770512A
- Authority
- US
- United States
- Prior art keywords
- weight
- parts
- mixture
- liquid carrier
- treatment
- 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 - Lifetime
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Classifications
-
- 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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
- C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
-
- 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
- C23C12/00—Solid state diffusion of at least one non-metal element other than silicon and at least one metal element or silicon into metallic material surfaces
- C23C12/02—Diffusion in one step
-
- 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
- C23C8/60—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 using solids, e.g. powders, pastes
- C23C8/62—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 using solids, e.g. powders, pastes only one element being applied
- C23C8/68—Boronising
- C23C8/70—Boronising of ferrous surfaces
Definitions
- PATENTEDMM a ma 3.770.512
- the present invention relates to a new and improved method for surface hardening steel and cemented carbides wherein, owing to a thermal treatment in a'mixture, there'is obtained at the material-undergoing treatment a relatively thick, fixedly anchored, infusion layer of high hardness.
- the inventive method for surface hardening of materials, especially steel and cemented carbides is generally manifested by the features that, the material, at a temperature exceeding approximately 570 C and extensively in the absence of oxygen, is brought into contact with a mixture containing approximately:
- the method can be used for the most different steels, such as carbon steels, alloyed and highly-alloyed steels, specialty steels, also cemented carbides and pressed cemented carbides and works with prepared powdery materials in accordance with the case-hardening principle.
- the exceptional action of the previously mentioned mixture is predicated upon the fact that the components are present in a glassy or vitreous condition, so that ionic excitations occur which result, for instance, in reactions of the following occur which result, for instance, in reactions of the following nature:
- the carbon necessary for this purpose can be either additionally added, especially in the form of carbon black, or it can be removed from the carbon content of the steel. Furthermore, if desired, tetrafluoromethane can be added separately to the mixture in the form of a gas.
- the mixture used in the practice of the inventive method has added thereto additional materials known to some extent for this purpose.
- additional materials known to some extent for this purpose.
- the addition of magnesium in the form of basic magnesium carbonate prevents any desired sintering of the hard metal or cemented carbide composition and permits a lowering of the temperatures, beneath 600 C, for instance.
- Suitable as the additives are, in particular, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, B, as such, or their oxides, carbides, borides, nitrides or silicides.
- the components are used in a powdery form, a grain or granulation size of approximately 180 to 320 mesh being preferred.
- a powdery form a grain or granulation size of approximately 180 to 320 mesh being preferred.
- the powdery mixture is dispersed in a liquid carrier, such as in particular dibutyl phthalate or an oil, so that it can be conveniently applied to the surface of the object or body.
- the treatment temperature is dependent upon the type of steel to be treated, generally is in a range above 570 C up to white heat or incandescence.
- the best steel hardness has been obtained at temperatures between approximately 750 C and 900 C, only conventional high temperature hardners, such as certain stainless steels (SS) and hot forged steels which can core soften between 750 C and 900 C require lower temperatures.
- SS stainless steels
- Treatment temperatures in the region of approximately 850 C are quite suitable.
- the inventive method is carried out extensively in the absence of oxygen, that is, air is excluded, or in the presence of a protective gas, such as nitrogen, inert or rare gases or CO
- a protective gas such as nitrogen, inert or rare gases or CO
- the clean steel product to be hardened is embedded in the powder, within a heatand corrosion resistant container or vessel, for instance formed of chromiumnickel-steel, graphite or the like, in such a manner that all sides of such product are tightly or snugly in contact with this powder.
- the vessel is then hermetically sealed, if desired oxygen is removed, and in a suitable and well known manner electrically heated, or heated in a reverberatory or air furnace up to the required temperature. Even after very short treatment times, for instance between 3 to 5 hours, exceptional hardness results have been obtained.
- the steel product together with the vessel is advantageously air cooled down to approximately 500 C. At this temperature the strewable powder can be removed through filters or sieves without suffering from contact with air. The steel product, if required, can be easily freed of any adhering powder. The powder then can be reused.
- FIGS. 1 to 10 there are indicated surface hardness, core hardness and layer thickness of the infusion layer as a function of the employed temperature for different types of steels and cemented carbides.
- the test samples have been pre-treated by the manufacturer, in the manner indicated in the following table, whereupon such have been treated in accordance with the inventive method as above-described at temperatures between 750 C and 900 C and permitted to cool in the furnace.
- the chain-dot or phantom line curve in each case indicates the results for a treatment time of 5 hours, the full-line curve for a treatment time of hours.
- the solid components are dispersed in the liquid carrier and the dispersion is applied by spraying, by immersion, or by wiping such onto the material or product to be treated.
- the advantages of the inventive method are considerable. At relatively low temperatures and short treatment times it is possible to obtain hardness values which previously could not be attained, values which oftentimes exceed the peak values of extremely hard sintered materials.
- the mixture of the invention may contain 1 to 10 ppm NaBF and l to 10 ppm sodium fluoride (NaF).
- the employed powder following treatment, remains completely strewable or pourable, can be used a number of times, sometimes as much as 5 to 10 times.
- the consumption of material is minimum, since it is limited to 0.02% to 0.8% of the weight of the infusion layer.
- Carrying out of the inventive method is extremely simple and it has versatile ap plicability.
- the treated material remains clean, dark in color and previously polished surfaces exhibit a dull gloss.
- a method of surface hardening materials by a boriding process comprising the steps of placing the material which is at a temperature in a range exceeding approximately 570 C to approximately 900 C and essentially in the absence of oxygen, into contact with a mixture consisting essentially of 5 to parts by weight boron carbide, 1 to 6 parts by weight anhydrous aluminum oxide, trace amounts up to 6 parts by weight N'aBF, and an amount of sodium fluoride up to 10 parts by weight sufficient to effect reaction at the material temperature.
- composition of matter for use in surface hardening materials, especially steel and cemented carbides consisting essentially of a mixture containing approximately 5 to by weight boron carbide, l to 60% by weight anhydrous aluminum oxide, trace amounts up to 6% by weight NaBF and trace amounts up to 10% by weight sodium fluoride.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1148470A CH556394A (de) | 1970-07-28 | 1970-07-28 | Verfahren zur oberflaechenhaertung von staehlen und sinterhartmetallen. |
Publications (1)
Publication Number | Publication Date |
---|---|
US3770512A true US3770512A (en) | 1973-11-06 |
Family
ID=4373934
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00165948A Expired - Lifetime US3770512A (en) | 1970-07-28 | 1971-07-26 | Method for surface hardening steel and cemented carbides |
Country Status (5)
Country | Link |
---|---|
US (1) | US3770512A (de) |
CH (1) | CH556394A (de) |
DE (1) | DE2137244A1 (de) |
FR (1) | FR2099641B1 (de) |
GB (1) | GB1363764A (de) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3836392A (en) * | 1971-07-07 | 1974-09-17 | Sandvik Ab | Process for increasing the resistance to wear of the surface of hard metal cemented carbide parts subject to wear |
US3874909A (en) * | 1971-12-20 | 1975-04-01 | Toyoda Chuo Kenkyusho Kk | Method for forming a carbide layer on the surface of an iron or ferrous alloy article |
US3935034A (en) * | 1972-01-24 | 1976-01-27 | Howmet Corporation | Boron diffusion coating process |
US3969157A (en) * | 1973-08-07 | 1976-07-13 | Vereinigte Edelstahlwerke Ag | Method of providing decarbonization protection for metallic surfaces |
US4398968A (en) * | 1981-08-28 | 1983-08-16 | Koichiro Koyama | Method of boronizing transition metal surfaces |
WO1983004293A1 (en) * | 1982-05-24 | 1983-12-08 | Clark Eugene V | Improvements in mechanical seal structures |
USRE32110E (en) * | 1971-05-26 | 1986-04-15 | General Electric Co. | Aluminum oxide coated cemented carbide product |
EP1026282A2 (de) * | 1999-02-05 | 2000-08-09 | Houghton Durferrit GmbH | Pastenförmiges Boriermittel |
US6503344B2 (en) | 1999-02-05 | 2003-01-07 | Houghton Durferrit Gmbh | Boronizing agent in paste form |
CN107201495A (zh) * | 2017-06-12 | 2017-09-26 | 武汉力盾新材料科技有限公司 | 一种用于硬密封阀门密封面的高耐磨硼化物覆层制备方法 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2450286A1 (fr) * | 1979-02-27 | 1980-09-26 | Armines | Procede et dispositif de boruration de pieces en metal |
FR2466512A1 (fr) * | 1979-09-28 | 1981-04-10 | Zaets Inna | Composition pour le revetement de metaux ferreux par diffusion |
JPS58500329A (ja) * | 1981-03-05 | 1983-03-03 | タ−バイン・メタル・テクノロジ−・インコ−ポレ−テッド | 耐摩耗性および耐壊食性部材およびそのための方法 |
US4555326A (en) * | 1984-05-17 | 1985-11-26 | Betz Laboratories, Inc. | Methods and compositions for boronizing metallic surfaces |
JPH07188898A (ja) * | 1993-12-27 | 1995-07-25 | Parker Netsushiyori Kogyo Kk | 固形ボロナイジング方法及びそれに用いる容器 |
GB2363391B (en) * | 1998-07-09 | 2002-06-12 | Sachs Race Eng Gmbh | Friction clutch with nickel-chromium alloy spring means and processes associated with making such spring means |
US6478887B1 (en) * | 1998-12-16 | 2002-11-12 | Smith International, Inc. | Boronized wear-resistant materials and methods thereof |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3029162A (en) * | 1959-05-21 | 1962-04-10 | Chromalloy Corp | Process for the production of metallic borides on the surface of metals |
US3286684A (en) * | 1962-12-24 | 1966-11-22 | Ling Temco Vought Inc | Cementation coating pack |
US3622374A (en) * | 1969-01-14 | 1971-11-23 | Ritter Praulder Corp | Diffusion coating of ferrous articles |
US3673005A (en) * | 1969-09-18 | 1972-06-27 | Kempten Elektroschmelz Gmbh | Process for borating metals,especially steel |
-
1970
- 1970-07-28 CH CH1148470A patent/CH556394A/de not_active IP Right Cessation
-
1971
- 1971-07-23 GB GB3469971A patent/GB1363764A/en not_active Expired
- 1971-07-26 DE DE19712137244 patent/DE2137244A1/de active Pending
- 1971-07-26 US US00165948A patent/US3770512A/en not_active Expired - Lifetime
- 1971-07-28 FR FR717127690A patent/FR2099641B1/fr not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3029162A (en) * | 1959-05-21 | 1962-04-10 | Chromalloy Corp | Process for the production of metallic borides on the surface of metals |
US3286684A (en) * | 1962-12-24 | 1966-11-22 | Ling Temco Vought Inc | Cementation coating pack |
US3622374A (en) * | 1969-01-14 | 1971-11-23 | Ritter Praulder Corp | Diffusion coating of ferrous articles |
US3673005A (en) * | 1969-09-18 | 1972-06-27 | Kempten Elektroschmelz Gmbh | Process for borating metals,especially steel |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE32110E (en) * | 1971-05-26 | 1986-04-15 | General Electric Co. | Aluminum oxide coated cemented carbide product |
US3836392A (en) * | 1971-07-07 | 1974-09-17 | Sandvik Ab | Process for increasing the resistance to wear of the surface of hard metal cemented carbide parts subject to wear |
US3874909A (en) * | 1971-12-20 | 1975-04-01 | Toyoda Chuo Kenkyusho Kk | Method for forming a carbide layer on the surface of an iron or ferrous alloy article |
US3935034A (en) * | 1972-01-24 | 1976-01-27 | Howmet Corporation | Boron diffusion coating process |
US3969157A (en) * | 1973-08-07 | 1976-07-13 | Vereinigte Edelstahlwerke Ag | Method of providing decarbonization protection for metallic surfaces |
US4398968A (en) * | 1981-08-28 | 1983-08-16 | Koichiro Koyama | Method of boronizing transition metal surfaces |
WO1983004293A1 (en) * | 1982-05-24 | 1983-12-08 | Clark Eugene V | Improvements in mechanical seal structures |
EP1026282A2 (de) * | 1999-02-05 | 2000-08-09 | Houghton Durferrit GmbH | Pastenförmiges Boriermittel |
EP1026282A3 (de) * | 1999-02-05 | 2000-10-18 | Houghton Durferrit GmbH | Pastenförmiges Boriermittel |
US6503344B2 (en) | 1999-02-05 | 2003-01-07 | Houghton Durferrit Gmbh | Boronizing agent in paste form |
CN107201495A (zh) * | 2017-06-12 | 2017-09-26 | 武汉力盾新材料科技有限公司 | 一种用于硬密封阀门密封面的高耐磨硼化物覆层制备方法 |
CN107201495B (zh) * | 2017-06-12 | 2019-11-22 | 武汉力盾新材料科技有限公司 | 一种用于硬密封阀门密封面的高耐磨硼化物覆层制备方法 |
Also Published As
Publication number | Publication date |
---|---|
FR2099641A1 (de) | 1972-03-17 |
DE2137244A1 (de) | 1972-02-03 |
GB1363764A (en) | 1974-08-14 |
FR2099641B1 (de) | 1973-06-29 |
CH556394A (de) | 1974-11-29 |
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