24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(21) Application No. 2267/DEL/1997 A (22) Date of filing of Application: 13/08/1997
(54) Title of the invention: “AN IMPROVED PROCESS FOR THE PREPARATION OF CERAMIC
MATRIX COMPOSITES SUCH AS Al2O3 - Sicw COMPOSITE.”
(51) International Classification 7 : C 04B 41/80
(30) Priority Data :
(31) Document No.: NA
(32) Date : NA
(33) Name of convention country : NA
(66) Filed U/s 5(2) : NIL
(61) Patent of addition to application No. : NA
(62) Filed on : NA
(63) Divisional to Application No. :NIL
(64) Filed on : NA
(57) Abstract:
(71) Name of the applicant:
COUNCIL OF SCIENTIFIC AND
INDUSTRIAL RESEARCH.
Address of the Applicant:
Rafi Marg, New Delhi – 110 001, India.
(72) Name of the Inventor:
DEBAJYOTI BANDYOPADHYAY
LOKESH CHANDRA PATHAK
RANJIT GHATAK GANGULY
SWAPAN KUMAR DAS
PATCHA RAMACHANDRA RAO
The process of present invention provides a modified SHS technique termed as rapid heating self
propagating high temperature synthesis (RH-SHS) for the manufacture of ceramic composites. In
this modified technique, the reacting mixture is heated rapidly so that a sharp thermal gradient is
established between surface and the core of the samples. A wide range of ceramic matrix
composites such as Al2O3 – TiC, Al2O3 – WC, MoSi2 – SiC, Al2O3 – TiB2, MgO – TiC, Al2O3 –
AIN – SiC, Al2O3 – ZrB2, TiB2 – B4C can be synthesized by this modified SHS process. In this
present invention aluminium, silica and carbon is used as raw materials for the production of Al2O3
– SiCw in-situ composite.
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