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1. WO1988003918 - FABRICATION DE TIGES DE HAUTE DENSITE UNIFORME A PARTIR DE POUDRES DE MATERIAUX REFRACTAIRES

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

What is claimed is:

1. A process for preparing a uniformly dense cylindrical rod having a length greater than its diameter, comprising the steps of:
furnishing a refractory material powder;
hot pressing the powder into a plate having two parallel faces with dimensions greater than the dimension through the thickness of the plate, the plate having at least one face dimension as long as the required length of the rod and a thickness greater than the diameter of the cylindrical rod, said step of hot pressing to occur at elevated temperature and with uniaxial pressing pressure applied parallel to the thickness direction of the plate;
cutting bars of the hot pressed material from the plate; and
machining the cut bars to a cylindrical rod form.

2. The process of claim 1, wherein the material of the rod is titanium carbide.

3. A process for preparing a rod of titanium carbide having a uniform density, comprising the steps of:
furnishing titanium carbide powder;
hot pressing the titanium carbide powder into the form of a plate having broad faces of greater dimension than the dimension through the thickness of the plate, said step of hot pressing to occur at. elevated temperature and with -the pressing pressure applied uniaxially to the broad faces of the plate;

cutting bars of square cross section from the plate; and
machining the square bars to a cylindrical rod shape.

4. The process of claim 3, wherein the titanium carbide powder is -325 mesh powder.

5. The process of claim 3, wherein the hot pressing temperature is about, 2000°C.

6. The process of claim 3, wherein the hot pressing pressure is about 1700 psi.

7. The process of claim 3, wherein the density of the hot pressed plate is about 96% of the theoretical density of the titanium carbide.

8. A titanium carbide rod prepared by the process of claim 3.

9. A titanium carbide single crystal produced from a titanium carbide rod prepared by the process of claim 3.