Abstract:
PURPOSE: Graphite, a method for manufacturing the same, and refractory with the low thermal conductivity are provided to expand the life expectancy of the refractory and improve the oxidation resistance characteristic of the graphite by coating alumina on the surface of the graphite. CONSTITUTION: Aluminum alkoxide is coated on the surface of graphite(S10). Graphite coated with the aluminum alkoxide is added in a solvent. The solvent is ethanol. The hydrolysis reaction of the aluminum alkoxide is implemented to coat alumina on the surface of the graphite(S20). In the hydrolysis reaction, 100.0 of water and ethanol-based solution is mixed with 7-80 parts by weight of the graphite coated with the aluminum alkoxide. The solvent is eliminated to obtain the graphite coated with the alumina(S30). The thermal conductivity of the graphite coated with the alumina is between 1 and 10Kcal/mhr°C.
Abstract:
본 발명은 용강 래들용으로 사용되는 내화물에 대하여 기존의 주성분으로 사용하고 있는 외래성 개재물로 유해한 Al 2 O 3 를 배제하면서 ZrO 2 -SiO 2 -C계 성분을 주성분으로 하고, 여기에 여타 성분을 적절히 배합함으로서 용강 중에 외래성 개재물의 혼입을 방지하는데 적합한 내화물에 관한 것이다. 이에 따른 구성은 용강의 정련, 주조를 위한 래들에 사용하는 내화물에 있어서, 용강과 접촉하는 부위의 내화물이 ZrO 2 50∼70중량부, C(탄소) 0.5∼5중량부, SiO 2 , SiC 중 적어도 1종이 30∼50중량부로 조성됨을 특징으로 하는 용강 래들용 내화물로 이루어진다. 래들. 내화물
Abstract:
The present invention relates to: a method for recycling silicone sludge wherein wasted silicone sludge generated in manufacturing a semiconductor and a wafer for a solar cell are processed by solidliquid separation (separation of solid and iquid), and liquid separation material is recycled as industry raw material and solid separation material are manufactured as ultra high temperature refractory material; and ultra high temperature refractory material manufactured according to the same. [Reference numerals] (AA) silicone sludge; (BB) Refinement cutting oil; (CC) Ultra high temperature refractory material
Abstract:
PURPOSE: A refractory composition of spinel/silicon carbide which strongly controls erosion of coal slag is provided to manufacture a non-chromium refractory composition with excellent corrosion resistance and resistance to the penetration of coal slag including alumina redundancy spinel, silicon carbide, and α-alumina and γ-alumina. CONSTITUTION: A refractory composition comprises spinel/silicon carbide with a ratio of 25:75-75:25 weight%. The refractory composition comprises 1-15 parts by weight of differential alpha alumina and 1-15 parts by weight of gamma alumina based on 100 parts by weight of spinel/silicon carbide. A manufacturing method of a refractory composition comprises the following steps: (i) adding differential alpha alumina and differential gamma alumina into the spinel-silicon carbide refractory composition; (ii) molding the mixture withwater into a specific form or coating the same with a material with decreased heat resistance; (iii) removing moisture from the molded product or coated molded product; (iv) changing a phase from gamma alumina to alpha alumina by heat-treating the mixture; And (v) combining the alpha alumina which phase changed from gamma alumina with the spinel-silicon carbide refractory composition.
Abstract:
PURPOSE: A strontium carbonate containing silicon carbide ceramic composition for manufacturing a high temperature dust collecting filter and a method for manufacturing the same are provided to improve the porosity and the intensity of the filter by including silicon carbide powder, mullite supplying materials, and strontium carbonate. CONSTITUTION: A strontium carbonate containing silicon carbide ceramic composition for manufacturing a high temperature dust collecting filter includes 3-5 parts by weight of mullite powder and 1-3 parts by weight of strontium carbonate based on 100 parts by weight of silicon carbide powder. A method for manufacturing a mullite combined porous silicon carbide high temperature dust collecting filter includes the following: 1-15 parts by weight of an organic binder as a molding agent and 5-20 parts by weight of a solvent based on 100 parts by weight of the silicon carbide ceramic composition; a molded dust filter is dried based on hot air; the dried filter is sintered under atmosphere at a temperature between 1400 and 1450 degrees Celsius for 0.5 to 1 hours. The organic binder is at least one of methylcellulose, ethylcellulose, carboxymehylcellulose, and polyvinyl alcohol.
Abstract:
PURPOSE: Provided is a ceramic heater, which generates heat under high temperature in a short time by controlling the mixing ratio of the components. CONSTITUTION: The ceramic heater heated by microwaves comprises: 10-20 wt% of aluminum oxide, 20-30 wt% of silicon dioxide, 20-60 wt% of silicon carbide, 1-10 wt% of magnesium oxide, 1-10 wt% of a loess and 1-10 wt% of a binder. The ceramic heater is produced by the method comprising: the step(S100) for preparing and mixing the above components; the step(S200) for forming the mixture obtained from the preceding step into a desired shape and drying; the step(S300) for firing the formed ceramic heater; and the step(S400) for carrying out the finishing treatment of the ceramic heater.
Abstract:
This invention provides a reaction-bonded silicon carbide article having superior abrasion resistance, oxidation resistance and uniformity in which the bond phase comprises appreciable amounts of both silicon oxynitride and alumina. Also provided are a raw batch and a process for producing the reaction-bonded article.