Abstract:
Optical storage system (20) including a disc drive and an optical media (28) having a low radial total indicated runout and method of manufacturing such media. The optical media includes a disc substrate (36) having a formatted surface (38) and a center hole (42). A disc alignment mechanism (40) is provided, wherein the concentric registration of the formatted surface is specified relative to the disc alignment mechanism. A hub (44) having a center hole (46) is positioned at the disc center hole, wherein the hub center hole is centered relative to the disc alignment mechanism. The disc drive includes a drive spindle (30) and a center pin (32) extending from the drive spindle for centering the drive spindle to the optical media.
Abstract:
PURPOSE: Provided is a method for environmentally friendly isolating magnesium oxide, which is produced from manufacturing of CB4 powder using B2O3, C and Mg by a self-propagation high temperature synthesis method. Thereby, MgO is effectively separated and can be recycled. CONSTITUTION: The method comprises steps of: (i) washing reaction products of B2O3, C and Mg with distilled water or alcohol to remove unreacted B2O3; (ii) after dispersing the resultant products of the step (i) in dilute sulfuric acid, stirring them to react the unreacted Mg and MgO of the reaction product with the sulfuric acid; (iii) filtering the resultant products of the step (ii) to separate CB4; and (iv) concentrating the filtrate of the step (iii) to obtain crystalline MgSO4·nH2O.
Abstract translation:目的:提供一种通过自传播高温合成方法由使用B2O3,C和Mg的CB4粉末制造而生产的环境友好的氧化镁隔离方法。 因此,MgO被有效地分离并且可以再循环。 方法:该方法包括以下步骤:(i)用蒸馏水或乙醇洗涤B2O3,C和Mg的反应产物以除去未反应的B2O3; (ii)将步骤(i)的所得产物分散在稀硫酸中后,搅拌使反应产物的未反应的Mg和MgO与硫酸反应; (iii)过滤步骤(ii)的所得产物以分离CB4; 和(iv)浓缩步骤(ⅲ)的滤液,得到结晶的MgSO 4·nH 2 O.
Abstract:
PURPOSE: Provided is a silica sol binder which has better adhesive strength than conventional binders and shows excellent chemical-resistant property and oxidizing-resistant property. And a method for preparing the same is also provided. CONSTITUTION: The silica sol binder comprises: (i) a silica sol generated by acid hydrolysis of Si(OC2H5)4 or ethyl silicate; and (ii) a siloxane selected from polysiloxane or R2Si(OR')2, wherein, R is CH3 and R' is selected from H, CH3 or CH2CH3, wherein, the quantity of water to be used for the acid hydrolysis of 1 mol of Si(OC2H5)4 is 2-3 mol. The method for preparing the silica sol binder comprises steps of: (i) mixing Si(OC2H5)4 solution with ethanol with stirring and then refluxing the mixture after adding acid solution thereto, for 1-4 hours to produce silica sol by acid-hydrolysis of the Si(OC2H5)4 solution; and (ii) adding a compound being able to form Si-CH3 with the silica sol, to the silica sol and then polymerizing it for 1-4 hours with refluxing.
Abstract:
PURPOSE: A ceramics-aluminium complex and its preparation method are provided, to homogenize the internal structure and to inhibit the formation of unnecessary phases, thereby to improve the physical properties of the complex. CONSTITUTION: The ceramics-aluminium complex is prepared by adding 0.1-3 wt% of alumina sol into the ceramic powder dispersed in distilled water to coat the surface of ceramic powder, thereby to improve the wetting; drying the ceramic powder to form molded products; optionally heat treating the molded products at the temperature of 1200 deg.C or more under vacuum or inert gas atmosphere; and infiltrating 35-50 vol% of aluminium into the molded products at 1,000-1,250 deg.C under vacuum or inert gas of atmospheric pressure. The ceramic powder is selected from B4C, TiB2, TiC, B4C-TiB2, or B4C-Al2O3.
Abstract:
The sintering temperature of high frequency inductor can be lowered to 1200deg.C from 1400deg.C by adding sintering aid to the powder which is prepared by partial co-precipitation of SnO2 sludge dissolved in Zr4-Ti4 aqueous solution with NH4OH. The obtained powder is sintered at 700-1200deg.C to give TiO4 powder, which is mixed with Zn(NO3)2 as sintering agent, molded into inductor, and sintered at 1100-1400deg.C to give high frequency inductor which maintains induction properties.
Abstract:
본 발명은 고주파 유전체 제조방법에 관한 것으로, SnO 2 입자 위에 Zr + , Ti 4+ 수산화물을 침전시키는 방법으로 ZST 분말을 제조한 것이다. 즉, SnO 2 슬러리에 Zr + Ti 4+ 의 수용액을, NH 4 OH를 사용하여 침전시키는 부분공침법으로 제조하는 공정과; 상기 제조된 분말을 700∼1200℃에서 하소하는 공정과; 하소하여 얻어진 (Zr 1 -x Snx)TiO 4 분말에 소결조제로 Zn(NO 3 )을 2∼4 mole% 첨가하는 공정과; 제조된 분말을 성형한 후, 1100-1400℃에서 소결하는 공정의 순서로 수행함을 특징으로 한다. 이와 같이 본 발명은 부분공침법을 이용하여 미세한 복합 분말을 제조함으로서 표면 활성에너지를 높여 상의 발달을 빠르게 해주고, 소결 온도를 낮출 수 있으며, 또한, 소결조제를 하소 후에 넣어주어 소결시에 입경계면에 머물게 함으로써 유전 특성을 유지하며, 소결온도를 낮추는 효과가 있다.