US1737711A - Hardening metal articles by nitrogenization - Google Patents
Hardening metal articles by nitrogenization Download PDFInfo
- Publication number
- US1737711A US1737711A US316362A US31636228A US1737711A US 1737711 A US1737711 A US 1737711A US 316362 A US316362 A US 316362A US 31636228 A US31636228 A US 31636228A US 1737711 A US1737711 A US 1737711A
- Authority
- US
- United States
- Prior art keywords
- nitrogenization
- portions
- chloride
- parts
- mixture
- 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
Links
- 229910052751 metal Inorganic materials 0.000 title description 11
- 239000002184 metal Substances 0.000 title description 11
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 14
- 239000000203 mixture Substances 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 12
- 238000000576 coating method Methods 0.000 description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 7
- 239000001103 potassium chloride Substances 0.000 description 7
- 235000011164 potassium chloride Nutrition 0.000 description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 4
- 239000004115 Sodium Silicate Substances 0.000 description 4
- 239000001110 calcium chloride Substances 0.000 description 4
- 229910001628 calcium chloride Inorganic materials 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- 229910052911 sodium silicate Inorganic materials 0.000 description 4
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 3
- 229910001626 barium chloride Inorganic materials 0.000 description 3
- 150000001805 chlorine compounds Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 229910001514 alkali metal chloride Inorganic materials 0.000 description 2
- 229910001617 alkaline earth metal chloride Inorganic materials 0.000 description 2
- 229910021538 borax Inorganic materials 0.000 description 2
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 2
- 229910000464 lead oxide Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000011833 salt mixture Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000004328 sodium tetraborate Substances 0.000 description 2
- 235000010339 sodium tetraborate Nutrition 0.000 description 2
- 241000212342 Sium Species 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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
- 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
- C23C8/04—Treatment of selected surface areas, e.g. using masks
Definitions
- the invention relates to a method for protecting certain portions of a metal article to be hardened by nitrogenization from acquir ing the nitrogenization hardness. This method may be performed e. g. in the following manner: I
- the metal articles to be hardened bynitrogenization are provided on the portions that are to be protected from acquiring the nitrogenization hardness with a coating ofv a salt, a salt mixture or of a glazingor enamel-like mass that during the hardening treatment protects the covered places from the action and penetration of nitrogen. It has been proved to be particularly suitable to provide the places to be protected with a coating of potassium chloride or with a'mixture of 2.0
- the places to be protected are painted with water glass and immediately thereafter coated, for example, with pulverizedpotassium chloride. If required this treatment is performed several times.
- the work piece After the work piece has been treated in the indicated manner, it is subjected to the proper nitrogenization hardening operation in which its unprotected portions are nitrogenized by a known process, for example, that disclosed in my U. S. Patent No. 1,487,554, whilst the portions previously coated as described with the protective means remain so soft that they can be machined without any difficulty.
- alkaline chloride as used in the appended claims is to be understood as including the chlorides of the alkali metals selected portions of a metal article, the steps which comprise applying onthe portions tobe protected a coating consisting of an alkaline chloride composition including potassium chloride and infusible at a nitrogenizing temperature and thereafter subjecting said article to a nitrogenizing treatment.
- the steps 7 which comprise applyingon the portions to be protected 9. coatin of sodium silicate, then applying to the t us coated portions a coating consisting of an alkaline chloride "composition including potassium chloride and I infusible at a nitrogenizing temperature, and thereafter subjecting said article to a nitrogenizing treatment.
- thetsteps which comprise applying on the portions to be protected a coating of sodium silicate, then applying to the thus coated portions a coating consisting of a mixture of alkali and alkaline earth metal chlorides, said mixture being substantially 'infusible at a nitrogenizing temperature, and thereafter subjecting said article to anitrogenizing treatment.
- a nitrogen-impenetrable coating com position consisting of a mixture of the following alkaline chlorides in about the roportions stated by weight: 2.0 parts barlum chloride, 1.5'parts potassium chloride, 1.0 part calcium chloride, 1.25 parts sodium chloride.
Description
Patented Dec. 3, 1929 STATES PATENT; OFFICE ADOLF FRY, OF IlSSEN, GERMANY, ASSIGNOR, .BY MESNE ASSIGNMENTS, TO THE NITRALLOY CORPORATION, A. CORPORATION 011 DELAWARE HABDENING METAL ARTICLES BY NITROGENIZATION No Drawing. Application filed October 31, 1928, Serial No. 316,362, and in Germany Novembenfl, 1927.
The invention relates to a method for protecting certain portions of a metal article to be hardened by nitrogenization from acquir ing the nitrogenization hardness. This method may be performed e. g. in the following manner: I
The metal articles to be hardened bynitrogenization are provided on the portions that are to be protected from acquiring the nitrogenization hardness with a coating ofv a salt, a salt mixture or of a glazingor enamel-like mass that during the hardening treatment protects the covered places from the action and penetration of nitrogen. It has been proved to be particularly suitable to provide the places to be protected with a coating of potassium chloride or with a'mixture of 2.0
. parts by weight of barium chloride, 1.5 parts by weight of potassium chloride, 1.0 part by weight of calcium chloride, and 1.25 parts by weight of sodium chloride or with a mixture of 7 parts by weight of lead oxide, 2 parts by weight of sand, and 1 part by weight of borax. In applying such a coating, one may advantageously proceed as follows:
The places to be protected are painted with water glass and immediately thereafter coated, for example, with pulverizedpotassium chloride. If required this treatment is performed several times.
In the same manner one proceeds in applying a salt mixture impermeable to nitrogen. The above-indicated mixture of lead oxide, sand, and borax is first melted, granulated and finely ground and is then applied in the manner described for the pulverized potas-' sium chloride. I
After the work piece has been treated in the indicated manner, it is subjected to the proper nitrogenization hardening operation in which its unprotected portions are nitrogenized by a known process, for example, that disclosed in my U. S. Patent No. 1,487,554, whilst the portions previously coated as described with the protective means remain so soft that they can be machined without any difficulty.
The expression alkaline chloride as used in the appended claims is to be understood as including the chlorides of the alkali metals selected portions of a metal article, the steps which comprise applying onthe portions tobe protected a coating consisting of an alkaline chloride composition including potassium chloride and infusible at a nitrogenizing temperature and thereafter subjecting said article to a nitrogenizing treatment.
3. In the hardening by nitrogenization of selected portions'of a metal article, the steps whichcomprise applying on the portions to be protected a coating consisting of a mixture of alkali and alkaline earth metal chlorides, said mixture being substantially infusible at a nitrogenizing temperature, and
thereafter subjecting said article to a nitrogenizing treatment.
4. In the hardening by nitrogenization of selected portions of a metal article, the steps which comprise applying on the portions to be protected a coating consisting of a mixture of the following alkaline chloridesin about the proportions stated by weight: 2.0 parts barium chloride, 1.5 parts potassium chloride, 1.0 part calcium chloride, 1.25 parts sodium chloride, and thereafter subjecting said article to a nitrogenizing treatment.
'5. In the hardening by nitrogenization of selected portions of a metal article, the steps which comprise applying on the portions to be protected a coating of sodium silicate, then applying to the thus coated portions a coating consisting of an alkaline chloride composition substantially in-fusible. at a nitrogenizing temperature, and thernafter subjecting said article to a nitr'ogenizing treatment.
6. In the hardening by nitrogenization of selected portions of a metal article, the steps 7 which comprise applyingon the portions to be protected 9. coatin of sodium silicate, then applying to the t us coated portions a coating consisting of an alkaline chloride "composition including potassium chloride and I infusible at a nitrogenizing temperature, and thereafter subjecting said article to a nitrogenizing treatment.
7. In the hardening by nitrogenization of selected portions of a metal article, thetsteps which comprise applying on the portions to be protected a coating of sodium silicate, then applying to the thus coated portions a coating consisting of a mixture of alkali and alkaline earth metal chlorides, said mixture being substantially 'infusible at a nitrogenizing temperature, and thereafter subjecting said article to anitrogenizing treatment.
8. In the hardening by nitrogenization of selected portions of a metal article, the steps which comprise applying on the portions to be protected acoating of sodium silicate, then applying to the thus coated portions a coating consisting of a mixture of the following alkaline chlorides in about the proportion stated by weight 2.0 parts barium chloride, 1.5 parts potassium chloride, 1.0 part calcium chloride,
1.25 parts sodium chloride, and thereaftersubjecting said article to a nitrogenizing treatment.
9. A nitrogen-impenetrable coating com position consisting of a mixture of the following alkaline chlorides in about the roportions stated by weight: 2.0 parts barlum chloride, 1.5'parts potassium chloride, 1.0 part calcium chloride, 1.25 parts sodium chloride.
The foregoing specification signed at Cologne, Germany, this'6 day of October,
ADOLF FRY;
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1737711X | 1927-11-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1737711A true US1737711A (en) | 1929-12-03 |
Family
ID=7741248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US316362A Expired - Lifetime US1737711A (en) | 1927-11-17 | 1928-10-31 | Hardening metal articles by nitrogenization |
Country Status (1)
Country | Link |
---|---|
US (1) | US1737711A (en) |
-
1928
- 1928-10-31 US US316362A patent/US1737711A/en not_active Expired - Lifetime
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2528787A (en) | Protection of metals from corrosion | |
US1737711A (en) | Hardening metal articles by nitrogenization | |
ES8304835A1 (en) | Process for applying a coating composition to a substrate, and the coated substrate thus obtained. | |
US1366305A (en) | Protective composition for heat treatment of articles of iron, steel, and the like | |
US2248732A (en) | Process for the hardening of steel | |
US1958575A (en) | Process for hardening iron, steel, and cast iron alloys by nitriding | |
GB1070169A (en) | A process for de-icing surfaces | |
US2321917A (en) | Method of annealing | |
US2528391A (en) | Methods of improving the durability of glass containers | |
US1567632A (en) | Composition of matter for selective case hardening | |
US1895439A (en) | Hardening metal articles by nitrogenization | |
GB300633A (en) | Improvements in hardening iron and steel articles by nitrogenization | |
US3698943A (en) | Protective coating | |
US3475230A (en) | Descaling process and material | |
US1664175A (en) | Heat treatment of alloys | |
US1724551A (en) | Salt bath | |
US1982718A (en) | Anticarburizing compound | |
GB1001301A (en) | Improvements in or relating to processes for applying alloys to metal surfaces | |
US1344658A (en) | Compound | |
US1993204A (en) | Method of case hardening articles | |
US2620310A (en) | Hardening bath | |
DE473681C (en) | Method of treating individual parts of an article to be hardened by nitriding against di | |
US1968922A (en) | Process of coating | |
US937263A (en) | Method of hardening and toughening metal. | |
US3087834A (en) | Process for vitreous enameling of magnesium and its alloys |