§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US5149677A Expired / Lapsed US ⏱️ 0.0 years remaining

Exothermic process for the production of molybdenum silicide composites

Assignee: Individual
•
Filing: 1991-04-30
•
Granted: 1992-09-22
•
Expires: 2011-04-30
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract The invention relates to the production of a new ceramic composite material containing molybdenum disilicide in the form of 20-60 μm grains. The method involves preparation of an exothermic mixture containing silicon, molybdenum (VI) oxide, aluminium and molybdenum with the following ratio of the components (wt %): ______________________________________ silicon 29-38 molybdenum (VI) oxide 7-42 aluminium 3-16 molybdenum 13-52 ______________________________________ its heat treatment in a combustion mode, followed by compaction of the obtained combustion products by way of at least two-stage compression with a degree of deformation from 0.75 to 0.90 at each stage, at a temperature within 1500° to 1900° C.

Inventors

  • 👤 Alexandr G. Merzhanov
  • 👤 Alexandr M. Stolin
  • 👤 Leonid M. Buchatsky
  • 👤 Sergei V. Vedeneev

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 18:41
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/58085; C04B35/58092; C04B35/622; C04B35/64; C04B35/645; C04B35/65; C04B35/651; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3231; C04B2235/3256; C04B2235/40; C04B2235/402; C04B2235/404; C04B2235/42; C04B2235/428; C04B2235/60; C04B2235/608; C04B2235/65; C04B2235/66; C04B2235/661; C04B2235/70; C04B2235/74; C04B2235/78; C04B2235/786; C04B2235/80

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 98 words
A method of producing a ceramic composite material comprising molybdenum silicide, aluminum oxide, and Al x Si y O z , where: x=2.6, y=3.6, z=5.13 characterized in that an exothermic mixture of the following composition (wt %) is formed: ______________________________________ silicon 29-38 molybdenum (VI) oxide 7-42 aluminium 3-16 molybdenum 13-52 ______________________________________ heat treatment of the said mixture is conducted in a combustion mode, followed by compaction of the obtained combustion products by way of at least two-stage compression with a degree of deformation within 0.75 to 0.90 at each stage, at a temperature within 1500° to 1900° C.
Claim 2
Independent Claim 98 words
A method of producing a ceramic composite material comprising molybdenum silicide, aluminum oxide, and Al x Si y O z , where: x=2.6, y=3.6, z=5.13 characterized in that an exothermic mixture of the following composition (wt %) is formed: ______________________________________ silicon 29-38 molybdenum (VI) oxide 7-42 aluminium 3-16 molybdenum 13-52 ______________________________________ heat treatment of the said mixture is conducted in a combustion mode, followed by compaction of the obtained combustion products by way of at least two-stage compression with a degree of deformation within 0.75 to 0.90 at each stage, at a temperature within 1500° to 1900° C.
Claim 3
Dependent Claim 32 words
A method according to claim 1, characterized in that the compaction of combustion products is carried out by way of forcing them through a die heated to a temperature of 200°-350° C.
Claim 4
Dependent Claim 23 words
A method according to claim 11, characterized in that the particle size of the prepared exothermic mixture is within 1.0 to 63 μm.
Claim 5
Dependent Claim 28 words
A method according to claim 3, characterized in that the exothermic mixture is compacted, prior to heat treatment, to a density of 40 to 60% of the theoretical.

References Cited (Backward Citations)

GB779129A Cited
GB779128A Cited
GB780735A Cited
US3056658A Cited
US3726643A Cited
US4528121A Cited
US4678760A Cited
EP0165707A2 Cited
US5011800A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-09-22 1996-03-23 1996-09-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-09-22 2000-03-23 2000-09-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-09-22 2004-03-23 2004-09-22 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag