FR2403846A2 - Moulds and cores for precision castings - made using mixt. of aluminium silicate(s) to improve surface finish of castings - Google Patents

Moulds and cores for precision castings - made using mixt. of aluminium silicate(s) to improve surface finish of castings

Info

Publication number
FR2403846A2
FR2403846A2 FR7728424A FR7728424A FR2403846A2 FR 2403846 A2 FR2403846 A2 FR 2403846A2 FR 7728424 A FR7728424 A FR 7728424A FR 7728424 A FR7728424 A FR 7728424A FR 2403846 A2 FR2403846 A2 FR 2403846A2
Authority
FR
France
Prior art keywords
mixt
castings
moulds
flour
precision
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.)
Granted
Application number
FR7728424A
Other languages
French (fr)
Other versions
FR2403846B2 (en
Inventor
Robert Michelon
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.)
UCPI
Original Assignee
UCPI
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 UCPI filed Critical UCPI
Priority to FR7728424A priority Critical patent/FR2403846A2/en
Publication of FR2403846A2 publication Critical patent/FR2403846A2/en
Application granted granted Critical
Publication of FR2403846B2 publication Critical patent/FR2403846B2/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The parent patent described moulds etc. for use in precision foundries. In this addn. a refractory moulding mixt. (a) with improved compaction properties, and a more suitable coefft. of thermal expansion (CTE) is used. Mixt. (a) consists of coarse grains(a1), and a fine filler flour(a2), where grains(a1) and possibly also the flour(a2) are mixts. of aluminium silicates(AS) contg. more than 60 wt.% Al2O3. The pref. AS contain 60-80% Al2O3, 20-40% SiO2 and less than 3% impurities, the m.pt. being 1800-1900 degrees C, and the linear CTE being 4.5-6 x 10-6; and with open porosity below 4%. Flour(a2) may consist entirely or partly of flake alumina; and the mixt. (a) may be employed as a facing material entering into contact with the molten metal. Although the moulds described in the main patent are generally satisfactory, a mould-metal reaction was observed with some types of steel. This invention results in castings with a better surface and more accurate dimensions.
FR7728424A 1977-09-21 1977-09-21 Moulds and cores for precision castings - made using mixt. of aluminium silicate(s) to improve surface finish of castings Granted FR2403846A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7728424A FR2403846A2 (en) 1977-09-21 1977-09-21 Moulds and cores for precision castings - made using mixt. of aluminium silicate(s) to improve surface finish of castings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7728424A FR2403846A2 (en) 1977-09-21 1977-09-21 Moulds and cores for precision castings - made using mixt. of aluminium silicate(s) to improve surface finish of castings

Publications (2)

Publication Number Publication Date
FR2403846A2 true FR2403846A2 (en) 1979-04-20
FR2403846B2 FR2403846B2 (en) 1982-07-16

Family

ID=9195605

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7728424A Granted FR2403846A2 (en) 1977-09-21 1977-09-21 Moulds and cores for precision castings - made using mixt. of aluminium silicate(s) to improve surface finish of castings

Country Status (1)

Country Link
FR (1) FR2403846A2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1021599A (en) * 1964-10-23 1966-03-02 Frederick Stephen Rambler Improvements relating to moulding
FR1521648A (en) * 1967-03-10 1968-04-19 Acieries Legenisel & Blanchard Precision casting composition and how to use it
FR1555737A (en) * 1967-11-24 1969-01-31
FR2152421A1 (en) * 1971-09-14 1973-04-27 British Cast Iron Res Ass Foundry moulds and cores - allowing re-use of refractory materials

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1021599A (en) * 1964-10-23 1966-03-02 Frederick Stephen Rambler Improvements relating to moulding
FR1521648A (en) * 1967-03-10 1968-04-19 Acieries Legenisel & Blanchard Precision casting composition and how to use it
FR1555737A (en) * 1967-11-24 1969-01-31
FR2152421A1 (en) * 1971-09-14 1973-04-27 British Cast Iron Res Ass Foundry moulds and cores - allowing re-use of refractory materials

Also Published As

Publication number Publication date
FR2403846B2 (en) 1982-07-16

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