Abstract:
PURPOSE: Sealant for bonding soda-lime silicate glass and a method for manufacturing the same are provided to cost effectively obtain the thermal stability without a lead oxide or a bismuth oxide. CONSTITUTION: Sealant for bonding soda-lime silicate glass includes 20-40 weight% of P_2O_5, 10 weight% or less of B_2O_3, and 20 weight% or less of ZnO, and SnO. The sealant further includes 10 weight% or less of one selected from a group including Li_2O, Na_2O, K_2O, V_2O_5, Al_2O_3, and Bi_2O_3. 15 weight% or less of eucryptite, spodumene, and cordierite are added to glass frit powder.
Abstract:
PURPOSE: A method for manufacturing a low melting point glass is provided to allow glass to be manufactured at the temperature lower than the melting point in atmosphere by inhibiting the oxidation of metal components in air. CONSTITUTION: A method for manufacturing a low melting point glass comprises the step of putting a glass frit and a reducing agent into a box-type electrical furnace using an alumina crucible and melting them at 900°C ~ 1100°C. The reducing agent is sucrose. The ratio of the sucrose and the glass frit is 0.01~0.1:1. The glass frit comprises 25-50 mole% of P2O5, 2.5-25 mole% of R2O3 (wherein R is B, Al, Bi), and the balance of SnO2.
Abstract translation:目的:提供一种制造低熔点玻璃的方法,以通过抑制空气中的金属成分的氧化,在低于大气中的熔点的温度下制造玻璃。 构成:制造低熔点玻璃的方法包括将玻璃料和还原剂放入使用氧化铝坩埚的盒式电炉中并在900℃〜1100℃下熔融的步骤。 还原剂是蔗糖。 蔗糖和玻璃料的比例为0.01〜0.1:1。 玻璃料包含25-50摩尔%的P 2 O 5,2.5-25摩尔%的R 2 O 3(其中R是B,Al,Bi),余量为SnO 2。
Abstract:
본 발명은 다전지식 고체산화물연료전지 (SIS-SOFC: Segmented-in-Series Solid Oxide Fuel Cell)의 세라믹 연결재용 페로브스카이트(perovskite)구조의 세라믹 조성에 불화물(CaF 2 , MgF 2 )을 소결조제로 첨가하여 미량 불화물을 함유하거나 원자가가 같은 자리에 환원성이 강한 원소를 미량 치환시켜 750~850℃ 산화, 환원분위기에서 높은 전도성을 유지함과 동시에 저온에서 소결이 가능한 연결재 분말을 제조하고, 이를 연결재 전사지로 제조하여 일정한 두께로 균일하게 적층할 수 있는 방법에 관한 것이다. 본 발명은 선행기술(특허 10-1241284호)에 의해 붕화물(LaB 6 , MgB 6 ) 및 불화물(CaF 2 , SrF 2 )중 1가지를 소결조제로 첨가하여 저온소결용 세라믹 연결재를 제조하는 특허의 특성을 향상시킬 수 있는 발명으로 A-site에 CaF 2 와 B-site에 MgF 2 를 동시치환하여 산화, 환원분위기에서 성능을 향상시킬 수 있는 세라믹 연결재를 제조하였다. 또한, 제조된 분말을 사용하여 전사대지 위에 세라믹 연결재 페이스트를 인쇄하여 고체상태의 연결재 전사지를 제작하였다. 제작된 연결재 전사지는 물 속에서 전사대지와 구성소재 층을 분리하여 고체상태의 연결재 층을 셀과 셀 사이에 적층하여 SIS-SOFC를 제작하였다. 고체상태의 연결재 층을 적층한 경우 다공성 연료극과 공기극 기공속으로 연결재 침투 없이 균일한 두께로 형성이 가능하게 되었다.
Abstract:
The present invention relates to a method of producing lithium titanate oxide for a negative electrode of a lithium ion battery which comprises the following steps: (A) diluting titanium tetrachloride (TiCl4) with titanium bichloride oxide (TiOCl2); (B) adding 0.1-2 mol% of yttrium chloride of niobium chloride based on Ti mol; (C) producing complex salts by inserting one compound selected from the group consisting of hydroxypropyl cellulose which is a complex salt and a dispersing agent and a polyethylene glycol which is a dispersing agent to a solvent; (D) synthesizing a titanium precursor by adding ammonia water; (E) producing titanium dioxide powder doped with yttrium or niobium by heat-processing the synthesis result at 500-700°C; and (F) mixing the titanium dioxide powder doped with yttrium or niobium with lithium hydroxide (LiOH·H2O) before heat-processing the mixture at 800-900°C. The present invention is economical by using cheap titanium tetrachloride(TiCl4), does not change the particle size or tap the density of the lithium titanate oxide by effectively doping yttrium or niobium and highly dispersing particles, improves electrochemical properties, and is capable of obtaining excellent lithium titanate oxide for producing a negative electrode of a lithium ion battery.
Abstract:
PURPOSE: A manufacturing method of silicon carbide nano fiber is provided to mass produce by having a simple manufacturing process and using low price raw materials, thereby applying in various fields such as a composite material and the like. CONSTITUTION: A manufacturing method of silicon carbide nano fiber comprises the following steps: (1 step) manufacturing expanded graphite by heat treating graphite which goes through an acid treatment; (2 step) mixing amorphous silica with organic solvent and uniformly dispersing the same to manufacture a mixture; (3 step) inserting amorphous silica powder between the expanded graphite layers by using vacuum desiccators after mixing the expanded graphite obtained in the previous step 1 with the amorphous silica solution obtained from step 2; (4 step) synthesizing graphite-silicon carbide nano fiber by heat treating under a reduction condition after drying the composite powder obtained from the step 3; and removing the graphite by heat treating the composite powder (graphite-silicon carbide) obtained from the previous step 4 under an oxidizing condition.
Abstract:
본 발명은 전자기기 등에서 발생하는 열을 방열하는 방열판에 관한 것으로 팽창된 흑연의 수직방향 층간 이방성층 내에 존재하는 공극(간극)을 비정질 실리카를 충진 후 열처리하는 공정으로 흑연 층간에 고열전도성 재료인 탄화규소를 합성하여 탄화규소-흑연 복합체를 제조함으로써 시트(sheet), 판(plate)등의 복합체 방열판으로 제조 시 수평방향의 열 확산뿐만 아니라 주로 수직방향으로의 열전도도를 더 획기적으로 향상시킬 수 있는 효과적인 고열전도성복합체 및 그의 제조 방법에 관한 것이다. 본 발명은 선행기술(특허 10-0921780호, 특허 10-2010-0136610)에 의해 천연흑연을 수평방향으로 비정질 카본을 충진 시켜 열전도도을 향상시켰으나 본 발명에서는 그 기술을 개선하여 팽창흑연에 고열전도성을 부여하는 방법을 발명한 것이다. 즉 팽창된 흑연을 미립자인 비정질 실리카를 잘 분산시켜 진공충진법으로 복합화 시킨 후 열처리 공정으로 흑연의 층간에 고열전도성 재료인 탄화규소를 형성시킴으로써 만들어진 탄화규소-흑연 복합체를 판(plate)이나 시트(sheet)로 제조하는 공정을 발명한 것이다. 그 효과로는 고열전도도특성과 고효율을 갖는 방열성능을 기대할 수 있다. 또한, 이 공법을 이용하여 다공성 분말에 서로 다른 특성의 미립자를 충진 시킴으로써 새로운 물성 및 재료의 특성 개선에 응용될 수 있다.
Abstract:
PURPOSE: A method for manufacturing nanospherical fiber lithium titanate using titanium tetrachloride is provided to improve electric conductivity and to enhance specific surface and energy density. CONSTITUTION: A method for manufacturing nanospherical fiber lithium titanate using titanium tetrachloride comprises: a step of preparing anatase titanium dioxide(TiO2) using titanium tetrachloride; a step of mixing anatase titanium dioxide and sodium hydroxide and synthesizing sodium titanate by hydrothermal synthesis; a step of performing ion exchange of sodium into hydrochloric acid and preparing titanate nanofiber; a step of mixing lithium hydroxide or lithium carbonate to the hydrogen titanate nanofiber and preparing Li1.81H0.19Ti2O5·2H2O; a step of dispersing Li1.81H0.19Ti2O5·2H2O in acetone and coating oleic acid; and a step of performing thermal treatment. [Reference numerals] (AA) Fig 1: scanning microscopic image of titania
Abstract:
PURPOSE: A manufacturing method of a silicon carbide-graphite composite sheet is provided to improve heat conductivity and heat diffusion efficiency in a horizontal direction of a graphite and to remarkably improve thermal conductivity. CONSTITUTION: A manufacturing method of a silicon carbide-graphite composite sheet comprises a step of expanding natural graphite by oxidizing the natural graphite; a step of filling the natural graphite, dispersing amorphous silica in pores between horizontal layers for vacuum filling; and a step of forming silica carbide-graphite composite by forming a high thermal conductivity between graphite layers, compression molding the carbide silicon-graphite composite by a roller or press to manufacture a sheet or a plate. [Reference numerals] (AA) Charging; (BB) Reduction thermal treatment; (CC) Reduced Si; (DD) Principle and flow map for the complexation of expanding graphite and silicon carbide