GB617792A - Improvements in or relating to magnetic particles for crack-detecting fluids, the production of such particles, and fluids containing such particles - Google Patents

Improvements in or relating to magnetic particles for crack-detecting fluids, the production of such particles, and fluids containing such particles

Info

Publication number
GB617792A
GB617792A GB2261346A GB2261346A GB617792A GB 617792 A GB617792 A GB 617792A GB 2261346 A GB2261346 A GB 2261346A GB 2261346 A GB2261346 A GB 2261346A GB 617792 A GB617792 A GB 617792A
Authority
GB
United Kingdom
Prior art keywords
particles
fluids
magnetic
crack
relating
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
Application number
GB2261346A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB2261346A priority Critical patent/GB617792A/en
Publication of GB617792A publication Critical patent/GB617792A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
    • G01N27/84—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields by applying magnetic powder or magnetic ink
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
    • H01F1/445—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids the magnetic component being a compound, e.g. Fe3O4

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Power Engineering (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

617,792. Magnetic materials. JOHNSON, L. July 30, 1946, No. 22613. [Class 38 (ii)] [Also in Group XXXVI] Relates to the detection of cracks in ferrous metals by magnetizing the metal and coating it with a liquid in which magnetic particles are suspended so that they are retained in the cracks; according to the invention, the magnetic particles consist of magnetic iron oxide which have been subjected to prolonged heat treatment to increase their permeability. Preferably, they are heated to 250-350‹ C. for about six hours. Specification 502,973, [Group XXXVI], is referred to.
GB2261346A 1946-07-30 1946-07-30 Improvements in or relating to magnetic particles for crack-detecting fluids, the production of such particles, and fluids containing such particles Expired GB617792A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2261346A GB617792A (en) 1946-07-30 1946-07-30 Improvements in or relating to magnetic particles for crack-detecting fluids, the production of such particles, and fluids containing such particles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2261346A GB617792A (en) 1946-07-30 1946-07-30 Improvements in or relating to magnetic particles for crack-detecting fluids, the production of such particles, and fluids containing such particles

Publications (1)

Publication Number Publication Date
GB617792A true GB617792A (en) 1949-02-11

Family

ID=10182273

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2261346A Expired GB617792A (en) 1946-07-30 1946-07-30 Improvements in or relating to magnetic particles for crack-detecting fluids, the production of such particles, and fluids containing such particles

Country Status (1)

Country Link
GB (1) GB617792A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345564A (en) * 1962-10-06 1967-10-03 Toyota Motors Company Ltd Method for non-destructive detection and observation of defects of ferromagnetic steels utilizing an aqueous ferromagnetic solution

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345564A (en) * 1962-10-06 1967-10-03 Toyota Motors Company Ltd Method for non-destructive detection and observation of defects of ferromagnetic steels utilizing an aqueous ferromagnetic solution

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