Back to results
US 6,958,303 B2Granted
Electro-static dissipative ceramic products and methods
AssigneeDou Yee Technologies PTE, LTD.
InventorsJian Guo Zhang, Hwey Eng Liow, Bo Zhang
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeDou Yee Technologies PTE, LTD.
InventorsJian Guo Zhang, Hwey Eng Liow, Bo Zhang
Estimating the term…
The invention provides partially stabilised zirconia and alumina based electro-static dissipative or ESD ceramic compositions. The proposed ceramic compositions include specific amounts of dopants comprising one or more metal oxides selected from iron oxide, chromium oxide and titanium oxide. The proposed ESD ceramic materials are made into useful industrial products by injection moulding and sintering technology. A novel binder system may optionally be used to make injection mouldable feedstock. Useful products produced by the invention include, for example, ESD ceramic tweezers tips, ESD ceramic dispensing needles, ESD ceramic scissors and blades and ESD ceramic wire bonding capillaries which retain their ESD properties at relatively low temperatures, for example, service temperatures from 25 to 500° C.
An ESD ceramic composition based on substantially pure alumina and dopant comprising 65-95 wt % substantially pure alumina (purity >99.95%) and 5-35% by weight of dopant, which comprises partially stabilised zirconia, with 5.2 wt % of yttria, and titanium oxide, wherein the dopant further comprises iron oxide.
An ESD ceramic composition based on substantially pure alumina and dopant comprising 65-95 wt % substantially pure alumina (purity >99.95%) and 5-35% by weight of dopant, which comprises partially stabilised zirconia, with 5.2 wt % of yttria, and titanium oxide, wherein the dopant further comprises chromium oxide.
An ESD ceramic composition based on substantially pure alumina and dopant comprising 65-95 wt % substantially pure alumina (purity >99.95%) and 5-35% by weight of dopant, which comprises partially stabilised zirconia, with 5.2 wt % of yttria, and titanium oxide, wherein the dopant further comprises iron oxide and chromium oxide.
An ESD ceramic composition based on substantially pure alumina and dopant comprising 65-85 wt % substantially pure alumina (purity >99.95%) and 5-25% by weight of dopant, which comprises partially stabilised zirconia, with 5.2 wt % of yttria, and 10-25 wt % of titanium oxide.
Dependencies are inferred from the claim text.