Solid-solution powder, method to prepare the solid-solution powder, cermet powder including the solid-solution powder, method to prepare the cermet powder, cermet using the cermet powder and method to prepare the cermet

A cermet powder being an agglomerate comprising (i) a carbide, a carbo-nitrite or mixture thereof of at least one element of metals selected from Iva, Va and VIa Group metals of periodic table, and (ii) at least one element of metals selected from Ni, Co And Fe, the agglomerate having nano-sized crystallites of 50 nm or less.

A cermet being a sinter of the cermet powder which is an agglomerate comprising (i) a carbide, a carbo-nitrite or mixture thereof of at least one element of metals selected from IVa, Va and VIa Group metals of periodic table, and (ii) at least one element of metals selected from Ni, Co And Fe, the agglomerate having nano-sized crystallites of 50 nm or less.

A method for preparing a solid-solution powder, the method comprising the steps of:

• mixing oxides having nano size of at least two elements of metals selected, including Ti, from IVa, Va and VIa Group metals of periodic table with carbon powders, in a predetermined composition (S1-1);
• and
• reducing and carburizing the mixed powders of the oxides and the carbon powders (S2).

A method for preparing a solid-solution powder, the method comprising the steps of:

• mixing oxides having micron size of at least two elements of metals selected, including Ti, from IVa, Va and VIa Group metals of periodic table with carbon powders, in a predetermined composition, and grinding the mixed powders of the oxides and the carbon powders to nano size or amorphous state (S1-2);
• and
• reducing and carburizing the mixed powders of the oxides and the carbon powders (S2).

A method for preparing a cermet powder, the method comprising the steps of:

• mixing (i) oxides having nano size of at least one element of metals selected from Ni, Co and Fe, (ii) oxides having nano size of at least one element of metals selected from IVa, Va and VIa Group metals of periodic table, and (iii) carbon powders, in a predetermined composition (S1-3);
• and
• reducing and carburizing the mixed powders of the oxides [(i) and (ii)] and the carbon powders (iii) (S2).

A method for preparing a cermet powder, the method comprising the steps of:

• mixing (i) oxides having micron size of at least one element of metals selected from Ni, Co And Fe, (ii) oxides having micron size of at least one element of metals selected from IVa, Va and VIa Group metals of periodic table, and (iii) carbon powders, in a predetermined composition, and grinding the mixed powders of the oxides [(i) and (ii)] and the carbon powders (iii) to nano size or amorphous state (S1-4);
• and
• reducing and carburizing the mixed powders of the oxides [(i) and (ii)] and the carbon powders (iii) (S2).

A method for preparing a cermet, the method comprising the step of:

• sintering a cermet powder which is an agglomerate comprising (i) a carbide, a carbo-nitrite or mixture thereof of at least one element of metals selected from IVa, Va and VIa Group metals of periodic table, and (ii) at least one element of metals selected from Ni, Co And Fe, the agglomerate having nano-sized crystallites of 50 nm or less.