Abstract:
본 발명은 백색 발광 형광체 및 그 제조방법에 관한 것으로, 그 목적은 전계방출소자용 형광체에 적용되는, 화학적 결합이 우수하고, 강한 전류 밀도에도 퇴화되지 않는 산화물 형광체 중에서 천연색을 발광하는 백색 발광 형광체 및 그 제조방법을 제공하는데 있다. 본 발명의 구성은 일반식 ZnGa 2 O 4 :X m ,Y n (단, 활성화제 X와 Y는 각각 Tb 3+ , Mn 2+ , Eu 3+ , Cr 3 로 이루어진 군중에서 선택된 서로 다른 하나이고, m은 0< m≤0.10의 범위이고, n은 0< n≤0.10의 범위임)로 표시되어 조성된 백색 발광 형광체 및 그 제조방법과 이를 이용한 전계발광소자를 특징으로 한다. ZnGa2O4:Xm,Yn, 형광체, 전계발광소자, 백색 광원
Abstract:
PURPOSE: A method of manufacturing a mixture alloy catalyst by a consecutive melting impregnation, and a mixture alloy catalyst thereof are provided to dip more than two kinds of alloy nano particles into a porous oxidation metal stent, and to manufacture various oxide types thereof. CONSTITUTION: A method of manufacturing a mixture alloy catalyst comprises the steps of: producing powder by grinding a porous support with one of the metal salts (S100); putting the mixed powder of metal salt and porous support in a reaction container, dipping and melting the powder at around the melting point of the metal salt (S200); drying the powder at room temperature (S300); putting the other metal salt to the powder and grinding together, then dipping and melting it at around the melting point of the added metal salt (S400); and alloying the metal salts in the porous support by plasticizing the dried powder under an atmosphere of nitrogen or hydrogen (S500). [Reference numerals] (S100) Step of producing powder by uniformly grinding a porous support with one of two or more metal salts; (S200) Step of putting the mixed powder of metal salt and the porous support in a reaction container and dipping and melting the powder at around the melting point of the metal salt; (S300) Step of drying the mixed powder of the metal salt and porous support at room temperature after the dipping and melting; (S400) Step of putting the other metal salt to the metal salt-dipped powder after drying, grinding together, and dipping and melting at around the melting point of the added metal salt; (S500) Step of plasticizing the dried powder under an atmosphere of air(atmosphere), nitrogen, or hydrogen after the dipping and melting and alloying the metal salts in the porous support; (S600) Step of blocking direct oxidization using ethanol after reduction in case of plasticizing under a hydrogen atmosphere
Abstract:
PURPOSE: A hybrid alloy catalyst manufactured by a multi-melt-infiltration process and a manufacturing method of the alloy catalyst are provided to easily support two or more alloy nanoparticles in a porous oxidation metal support. CONSTITUTION: A manufacturing method of a hybrid alloy catalyst includes the steps of: mixing two or more metal salts and a porous support; fusing the metal salts by a multi-melt-infiltration process; and alloying the metal salts in the porous support by a high temperature plasticizing process. The melting point of the metal salts are in the range of 20-130°C. [Reference numerals] (a) Mixing step of hybrid metal salts and a support; (AA) Porous metal oxide support (Silica, alumina); (b) Fusing salts by common melt infiltration; (BB) Common melt infiltration; (c) Step of alloying by a high temperature plasticizing process; (CC,DD) Metal salts; (EE) Mixed metal salts / Support; (FF) High temperature plasticizing (hydrogen atmosphere); (GG) Alloy metal particle supported catalyst
Abstract:
PURPOSE: A carbon based multi-composite metal oxide nano catalyst carrier and a production method thereof are provided to show high reactivity and high stability preventing coagulation between particles in case of a high-temperature catalytic reaction as active metal catalyst particles are uniformly carried onto a metal oxide and a remaining carbon carrier for scaffold in a high concentration. CONSTITUTION: A carbon based multi-composite metal oxide nano catalyst carrier production method comprises the following steps; a formation step which forms mixed powder by fusing metal-oxide salt-hydrate for a catalyst, metal-oxide salt-hydrate for a scaffold, and a porous carbon molding frame; a melt infiltration step which melts and impregnates the metal-oxide salt-hydrate for an active catalyst and the metal-oxide salt-hydrate for the scaffold into the carbon molding frame by melting and impregnating at a temperature around the melting point of the mixed metal-oxide salt-hydrate; a drying step which dries the mixed power which is melted and impregnated; and a removal and impregnating step which removes the carbon molding frame before sintering the mixed powder which is melted and impregnated at a high temperature, and impregnating the active metal-oxide particles into a metal oxide for the scaffold and remaining carbon by resolving the metal-oxide salt-hydrate for the active catalyst and the metal-oxide salt-hydrate for the scaffold. High temperature sintering is performed at a temperature ranged 300-650 deg. C for 1- 24 hours. [Reference numerals] (AA) Melt-infiltration; (BB) Amorphous salt complex dipped in porous carbon; (CC) High temperature sintering under the atmospheric condition; (DD) Removal of a carbon molding frame, Decomposition of salt; (EE) Oxidized metal particle(alumina, zirconia,..) functioning as a scaffold; (FF) Active particle; (GG) Remaining carbon