GB829799A - Improvements relating to hard ceramic materials - Google Patents

Improvements relating to hard ceramic materials

Info

Publication number
GB829799A
GB829799A GB2935757A GB2935757A GB829799A GB 829799 A GB829799 A GB 829799A GB 2935757 A GB2935757 A GB 2935757A GB 2935757 A GB2935757 A GB 2935757A GB 829799 A GB829799 A GB 829799A
Authority
GB
United Kingdom
Prior art keywords
alumina
gamma
gram
surface area
over
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
GB2935757A
Inventor
Richard Malcolm Gill
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.)
Unifrax 1 LLC
Original Assignee
Carborundum Co
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 Carborundum Co filed Critical Carborundum Co
Priority to GB2935757A priority Critical patent/GB829799A/en
Publication of GB829799A publication Critical patent/GB829799A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/148—Composition of the cutting inserts

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

Wear-resistant bodies composed substantially wholly of alumina (i.e. at least 96%) are prepared by hot pressing at a temperature of at least 1400 DEG C. and a pressure of at least 1000 p.s.i., a gamma alumina powder having a surface area of over 200 square metres/gram (corresponding to a mean particle size of about 0.01 microns or less), or by hot pressing under the same conditions a gamma-alumina monohydrate of such fineness as would on calcination result in a gamma alumina powder having a surface area of over 200 square metres/gram. The pressing is preferably carried out at a temperature of 1400 DEG C. to 1700 DEG C. and a pressure of 1000 p.s.i. to 5000 p.s.i. The resulting alumina bodies may be employed in the manufacture of cutting tools, thread guides, nozzles, and wire-drawing dies. In examples, discs prepared by the above process, having a density of from 3.92 to 3.94 gm/cc., were shaped into lathe cutting tool tips by guiding with a diamond abrasive wheel.
GB2935757A 1957-09-18 1957-09-18 Improvements relating to hard ceramic materials Expired GB829799A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2935757A GB829799A (en) 1957-09-18 1957-09-18 Improvements relating to hard ceramic materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2935757A GB829799A (en) 1957-09-18 1957-09-18 Improvements relating to hard ceramic materials

Publications (1)

Publication Number Publication Date
GB829799A true GB829799A (en) 1960-03-09

Family

ID=10290242

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2935757A Expired GB829799A (en) 1957-09-18 1957-09-18 Improvements relating to hard ceramic materials

Country Status (1)

Country Link
GB (1) GB829799A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151994A (en) * 1960-12-20 1964-10-06 Kempten Elektroschmelz Gmbh Molding of refractory materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151994A (en) * 1960-12-20 1964-10-06 Kempten Elektroschmelz Gmbh Molding of refractory materials

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