Process for manufacturing ultra fine TiC-transition metal-based complex powder
View Patent ↗Any one of a Ti-containing water-soluble salt, metatitanic acid (TiO(OH) 2 ) slurry and ultra fine titanium oxide powder, and a transition metal containing metal salt are dissolved in water to prepare a raw material mixture. The raw material is spray-dried to obtain precursor powder, which is calcined to form ultra fine Ti/transition metal complex oxide and is then mixed with nano-sized carbon particles and subjected to reduction and carburization in a non-oxidizing atmosphere.
1. A method of producing TiC-transition metal-based complex powder, comprising the steps of:
(a) preparing a raw material mixture by dissolving or dispersing a TiO(OH) 2 slurry, and cobalt nitrate in water, followed by spray-drying to obtain precursor powder;
(b) calcining the precursor powder to form ultrafine Ti—Co complex oxide powder;
(c) mixing the ultra fine Ti—Co complex oxide powder with nano-sized carbon particles, followed by drying to obtain complex oxide powder; and
(d) subjecting the dried complex oxide powder to reduction/carburization in a non-oxidizing atmosphere wherein the reduction and carburization is performed by reduction at a temperature between 600° C. to 1100° C. and then reduction and carburization at a temperature between 1200° C. to 1350° C.
2. The method according to claim 1 , wherein the content of the cobalt in the complex powder is in the range of 1 to 30 wt %.
3. The method according to claim 1 , wherein the calcination is performed at a temperature between 350 to 1000° C.
4. The method according to claim 1 , wherein the TiC—Co complex powder has a particle size of from 50 nm to 300 nm.
5. The method according to claim 1 , wherein said TiC—Co complex powder is TiC-15 wt % Co complex powder.
6. A method of producing TiC-transition metal-based complex powder, comprising the steps of:
(a) preparing a raw material mixture by dissolving or dispersing a nano-sized TiO 2 and cobalt nitrate in water, followed by spray-drying to obtain precursor powder;
(b) calcining the precursor powder to form ultrafine Ti—Co complex oxide powder,
(c) mixing the ultra fine Ti—Co complex oxide powder with nano-sized carbon particles, followed by drying to obtain complex oxide powder; and
(d) subjecting the dried complex oxide powder to reduction/carburization in a non-oxidizing atmosphere wherein the reduction and carburization is performed by reduction at a temperature between 600° C. to 1100° C. and then reduction and carburization at a temperature between 1200° C. to 1350° C.
7. The method according to claim 6 , wherein the content of the cobalt in the complex powder is in the range of 1 to 30 wt %.
8. The method according to claim 6 , wherein the calcination is performed at a temperature between 350 to 1000° C.
9. The method according to claim 6 , wherein the Ti—Co complex is TiC-15 wt % Co complex powder.