US1671034A - Case hardening - Google Patents

Case hardening Download PDF

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Publication number
US1671034A
US1671034A US163559A US16355927A US1671034A US 1671034 A US1671034 A US 1671034A US 163559 A US163559 A US 163559A US 16355927 A US16355927 A US 16355927A US 1671034 A US1671034 A US 1671034A
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US
United States
Prior art keywords
case
case hardening
sulphide
hardening
hardened
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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US163559A
Inventor
Lennartz Andreas
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Individual
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Individual
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Publication of US1671034A publication Critical patent/US1671034A/en
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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
    • 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 has or its object to avoid .the said drawback by adding a sulphide, for
  • ferrous sulphide to the known proroved by. 1 numerous tests that a sulphide a ded to the tective masses; It has been said rotective masses securely prevents during t e cementation process any penetration v of carbon into those portions of the articles.
  • composition of matter used in selective case-hardening including the addition of a sulphide to the composition employedtoprotect portions of the article being case-hardened again; such action.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Adornments (AREA)
  • Dental Preparations (AREA)

Description

10 to be hardened durin Patented May 22,1928.
PATENT annnnas nnnnmrz, or mum Aachen, 6 1mm.
CASE nannnnme.
.lIo Drawing. Application filed January 25,- 1927, Serial 80. 163,550,311! in Germany February 15, me.
In case-hardening articles of iron or iron allo s there is often desired onl a partial tive mass. However, the protective masses such as kaolin, loam, et cetera used hitherto do not 've surety for completely preventing the di usion of carbon into the portions not the cenientation.
The invention has or its object to avoid .the said drawback by adding a sulphide, for
instance ferrous sulphide, to the known proroved by. 1 numerous tests that a sulphide a ded to the tective masses; It has been said rotective masses securely prevents during t e cementation process any penetration v of carbon into those portions of the articles.
treated which are designed to remain un- 20 hardened.
Having thus described my invention, what I- claim as new and desire to secure I by Letters-Patent is 1. An improved composition of matter used in selective case-hardening, including the additionof ferrous-sulphide to the composition employed to protect portions of the article being case-hardened against such action. 1 v
'2. An improved composition of matter used in selective case-hardening; including the addition of a sulphide to the composition employedtoprotect portions of the article being case-hardened again; such action.
name tothis specification.
- ANDREAS m sn rrz.
'oFFicEi.
In testimony whereof I have signed my 86
US163559A 1926-02-15 1927-01-25 Case hardening Expired - Lifetime US1671034A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1671034X 1926-02-15

Publications (1)

Publication Number Publication Date
US1671034A true US1671034A (en) 1928-05-22

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ID=7738873

Family Applications (1)

Application Number Title Priority Date Filing Date
US163559A Expired - Lifetime US1671034A (en) 1926-02-15 1927-01-25 Case hardening

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080230083A1 (en) * 2007-03-20 2008-09-25 Latasha Williams Passage braid guide measuring comb

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080230083A1 (en) * 2007-03-20 2008-09-25 Latasha Williams Passage braid guide measuring comb

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