A method 1, in which heating the final mixture is to a temperature of {TAIL ~ 1550° 1700° C.}, after pressing thereof to a pressure of {HEAD ~ at least 35 MPa}, to make a unitary artefact 
A method 1 , in which heating the final mixture is to a temperature of { TAIL ~ 1550 ° 1700 ° C. } , after pressing thereof to a pressure of { HEAD ~ at least 35 MPa } , to make a unitary artefact
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH