C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/64 (2006.01) C04B 35/486 (2006.01) F27D 5/00 (2006.01)
Patent
CA 2219843
The invention concerns a process for sintering preform tubes (2) in an oven in order to obtain very straight ceramic tubes. During the sintering, the preform tubes are placed inside ceramic supporting tubes (1). The preform tubes (2) have an internal diameter between 1.8 and 2.2 mm, and an external diameter between 3 and 4 mm. The supporting tubes (1) have an internal diameter greater than 4.5 mm. Thus the inside surface of the supporting tubes does not differ significantly from an ideal cylinder; it deviates from perfect straightness by less than 0.1 mm over a length of 90 mm.
La présente invention a pour objet un procédé de frittage de tubes-ébauches (2) dans un four en vue de l'obtention de tubes en céramique présentant une grande rectitude, dans lequel, au cours du frittage, les tubes-ébauches (2) sont placés à l'intérieur de tubes-supports (1) en matière céramique, lesdits tubes-ébauches (2) ayant un diamètre intérieur compris entre 1,8 et 2, 2mm et un diamètre extérieurcompris entre 3mm et 4mm et les tubes-supports (1) ayant un diamètre intérieur supérieur à 4,5mm. Ainsi, la surface intérieure des tubes-supports (1) ne s'écarte pas sensiblement d'un cylindre idéal, le défaut de rectitude de cette surface étant inférieur à 0,1mm sur une longueur de 90mm.
Gillot Jacques
Henneguez Philippe
Martreuil Martial
Robic
Societe Des Ceramiques Techniques
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