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公开(公告)号：KR1020030085371A
公开(公告)日：2003-11-05
申请号：KR1020020023774
申请日：2002-04-30
Applicant: 한국과학기술연구원
IPC: C04B35/573
CPC classification number: C04B35/63 , B82Y30/00 , C04B35/573 , C04B35/634 , C04B2235/3826 , C04B2235/422 , C04B2235/428 , C04B2235/48 , C04B2235/5436 , C04B2235/5454 , C04B2235/604 , C04B2235/608 , C04B2235/77
Abstract: PURPOSE: Provided is a method for producing a reaction bonding silicon carbide, which supplies melted silicon effectively regardless of the form, size and thickness of the reaction bonding silicon carbide, prevents the cohesion of the melted silicon, and supplies the melted silicon uniformly. CONSTITUTION: The method comprises the steps of: preparing a silicon supplying specimen composed of a silicon powder and a thermosetting resin selected from the group consisting of a phenol resin, a furfuryl alcohol resin and an epoxy resin as a binding agent; preparing a silicon carbide/carbon filling body; contacting the silicon supplying specimen to one side of the filling body in a reaction bonding furnace; and heat treating at the temperature higher than the melting point of the silicon under vacuum or an inert atmosphere to infiltrate the melted silicon in the silicon supplying specimen into the inside of the filling body.
Abstract translation: 目的：提供一种生产反应接合碳化硅的方法，无论反应结合碳化硅的形式，尺寸和厚度如何，均有效地提供熔融硅，防止熔融硅的内聚力，并均匀地供应熔融的硅。 方法：该方法包括以下步骤：制备由硅粉末和选自酚醛树脂，糠醇树脂和环氧树脂作为粘合剂的热固性树脂组成的供硅试样; 制备碳化硅/碳填充体; 在反应接合炉中使供硅试样与填充体的一侧接触; 在高于真空或惰性气氛的硅的熔点的温度下进行热处理，将硅供应试样中的熔融硅浸入填充体的内部。
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公开(公告)号：KR1020030073445A
公开(公告)日：2003-09-19
申请号：KR1020020013003
申请日：2002-03-11
Applicant: 한국과학기술연구원
IPC: B01J2/06
Abstract: PURPOSE: A method for preparing powder granules by liquid condensation process is provided to economically prepare uniform granules without defects, and a method for compacting powder granules by liquid condensation process is provided to freely change compaction density of granules and improve compactibility of powder granules. CONSTITUTION: The method comprises the processes of preparing slurry by mixing powder and binder with solvent(13) soluble for the binder; dropping the slurry into solvent insoluble for the binder, thereby fixing the binder so that the binder is prevented from coming out of the surface of droplets, and causing replacement between the soluble solvent and insoluble solvent inside the droplets on the surface of dropped slurry droplets, thereby condensing the droplets; and completely removing residual solvent by drying the separated droplets after separating condensed droplets from the insoluble solvent. The method for compacting powder granules by liquid condensation process comprises the processes of preparing slurry by mixing powder to be compacted and binder with solvent soluble for the binder; dropping the slurry into solvent insoluble for the binder, thereby fixing the binder so that the binder is prevented from coming out of the surface of droplets, and causing replacement between the soluble solvent and insoluble solvent inside the droplets on the surface of dropped slurry droplets, thereby condensing the droplets; completely removing residual solvent by drying the separated droplets after separating condensed droplets from the insoluble solvent; preparing green compact by pressing the dried granules in mold; and degreasing the binder by heating the green compact.
Abstract translation: 目的：提供一种通过液体缩合方法制备粉末颗粒的方法，以经济地制备无缺陷的均匀颗粒，并提供通过液体冷凝方法压实粉末颗粒的方法，以自由改变颗粒的压实密度并提高粉末颗粒的紧密度。 构成：该方法包括通过将粉末和粘合剂与可溶于粘合剂的溶剂（13）混合来制备浆料的方法; 将浆料滴入不溶于粘合剂的溶剂中，由此固定粘合剂，从而防止粘合剂从液滴的表面流出，并引起可滴落的液滴表面上的液滴内的可溶性溶剂和不溶性溶剂之间的置换， 从而冷凝液滴; 并在从不溶性溶剂中分离出浓缩的液滴后，通过干燥分离的液滴来完全除去残余溶剂。 通过液体冷凝法压粉粉末颗粒的方法包括通过将要压实的粉末和粘合剂与可溶于粘合剂的溶剂混合来制备浆料的方法; 将浆料滴入不溶于粘合剂的溶剂中，由此固定粘合剂，从而防止粘合剂从液滴的表面流出，并引起可滴落的液滴表面上的液滴内的可溶性溶剂和不溶性溶剂之间的置换， 从而冷凝液滴; 在从不溶性溶剂中分离浓缩的液滴后，通过干燥分离出的液滴来完全除去残留溶剂; 通过在模具中挤压干燥的颗粒制备生坯; 并通过加热生坯来去除粘合剂。
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公开(公告)号：KR1020030063763A
公开(公告)日：2003-07-31
申请号：KR1020020004042
申请日：2002-01-24
Applicant: 한국과학기술연구원
CPC classification number: C09G1/02 , C01P2004/64 , C09K3/1409 , C09K3/1463 , H01L21/3212 , Y10S977/888
Abstract: PURPOSE: A slurry for a tungsten CMP (chemical mechanical polishing) is provided, which shows an excellent dispersion stability of nano-sized ceramic particles in an aqueous solution and a high polishing efficiency. CONSTITUTION: The slurry comprises 5-25 wt% of a polishing agent; 1-5 wt% of an oxidizing agent; 0.4-4 wt% of an oxidation accelerator; and 1-10 wt% of an oxidation acceleration stabilizer, and is stable at pH 3-5. Preferably the polishing agent is 5-10 wt% of nano-sized alumina or 5-25 wt% of nano-sized silica, and has an average particle size of 200 nm or less; the oxidizing agent is hydrogen peroxide; the oxidation accelerator is 0.05-0.5 M Fe(NO3)3; and the oxidation acceleration stabilizer is 1-10 wt% of citric acid, 0.5-5 wt% of malonic acid or 0.6-6 wt% of oxalic acid.
Abstract translation: 目的：提供用于钨CMP（化学机械抛光）的浆料，其显示了纳米级陶瓷颗粒在水溶液中的优异分散稳定性和高抛光效率。 构成：浆料包含5-25重量％的抛光剂; 1-5重量％的氧化剂; 0.4-4重量％的氧化促进剂; 和1-10重量％的氧化加速稳定剂，在pH 3-5时稳定。 抛光剂优选为5-10重量％的纳米尺寸氧化铝或5-25重量％的纳米尺寸二氧化硅，平均粒度为200nm以下; 氧化剂是过氧化氢; 氧化促进剂为0.05〜0.5M Fe（NO 3）3; 氧化加速稳定剂为柠檬酸1-10重量％，丙二酸0.5-5重量％，草酸0.6-6重量％。
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公开(公告)号：KR100355350B1
公开(公告)日：2002-10-11
申请号：KR1020000006460
申请日：2000-02-11
Applicant: 한국과학기술연구원
IPC: C04B35/565
Abstract: 본 발명은 실형상 반응결합 탄화규소 제조방법에 관한 것으로, 탄화규소 분말, 열경화성 수지, 열가소성 수지, 경화제 및 표면활성제를 균일하게 혼합하여 슬러리를 만들고, 상기 슬러리를 원하는 형상의 몰드에 주입하고 가열 경화시켜 성형체를 형성하고, 상기 성형체를 가열하여 열가소성 수지를 탈지시키고, 상기 성형체를 가열하여 열경화성 수지를 탄화시키고, 고온하에서 상기 성형체에 용융 금속규소를 침투시키는 것으로 이루어지는 실형상 반응결합 탄화규소 제조방법을 제공한다. 본 발명에 의하면 복잡한 형상을 가지는 고강도의 반응결합 탄화규소 제품을 고가의 장비없이 경제적으로 제조할 수 있다.
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公开(公告)号：KR100355349B1
公开(公告)日：2002-10-11
申请号：KR1020000006457
申请日：2000-02-11
Applicant: 한국과학기술연구원
IPC: C04B35/565
Abstract: 본 발명은 반응결합 탄화규소의 제조방법에 관한 것으로, 탄화규소분말, 열경화성 수지 및 열가소성 수지를 포함하는 제1혼합물을 원심성형기 내에서 가열반응 원심성형에 의하여 실시간으로 경화시켜 첫 번째 층을 형성시키고, 규소분말, 열경화성 수지 및 열가소성 수지를 포함하는 제2혼합물을 원심성형기 내에서 가열반응 원심성형에 의하여 실시간으로 경화시켜 두 번째 층을 형성시켜 상기 첫 번째 층과 두 번째 층의 이중 구조로된 성형체를 제조하고, 상기 성형체의 열가소성 수지를 제거하고, 상기 성형체의 열경화성 수지를 열분해시켜 성형체를 탄화시키고, 상기 탄화된 성형체를 고온으로 가열하는 것으로 이루어지는 반응결합 탄화규소 제조방법을 제공한다. 본 발명에 의하면 반응결합 탄화규소 제품을 제조할 경우 대형 튜브의 성형을 위한 정수압 성형장치나 전처리를 위한 고온 진공로, 그리고 용융규소 침윤을 위한 고온 진공 용해로가 필요없으며, 용융 규소에 의해 로(furnace) 치구가 손상될 염려가 없으므로 유지비가 적게 들어 경제적으로 높은 밀도의 반응결합 탄화규소 제품을 대형으로 제조하는 것이 가능하다.
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Patent Agency Ranking
公开(公告)号：KR1020010044920A
公开(公告)日：2001-06-05
申请号：KR1019990047980
申请日：1999-11-01
Applicant: 한국과학기술연구원
IPC: H01B3/12
Abstract: PURPOSE: A ultrafine dielectric ceramic composition for a low temperature plasticity is provided to achieve a low temperature plasticity and an ultrafine BaTiO3 dielectric ceramic composition by adding a proper sintering material to the BaTiO3. CONSTITUTION: A ultrafine dielectric ceramic composition for a low temperature plasticity is made based on the following formula BaTiO3 + xCu3TiO4. Here, x is ranging from 0.00 to 0.05. M2O3 is added to the composition as much as 0 to 5 mole. Here, M is one or more selected from the group consisting of La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er and Yb.
Abstract translation: 目的：提供一种低温可塑性的超细电介质陶瓷组合物，以通过向BaTiO3中加入适当的烧结材料来实现低温塑性和超细BaTiO3电介质陶瓷组合物。 构成：基于下列公式BaTiO3 + xCu3TiO4制造低温可塑性的超细电介质陶瓷组合物。 这里，x为0.00〜0.05。 向组合物中加入多至0至5摩尔的M2O3。 这里，M是选自La，Pr，Nd，Sm，Eu，Gd，Tb，Dy，Ho，Er和Yb中的一种或多种。
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公开(公告)号：KR1019960012733B1
公开(公告)日：1996-09-24
申请号：KR1019940015398
申请日：1994-06-30
Applicant: 한국과학기술연구원
IPC: C04B38/00
Abstract: The porous ceramics is prepared by (a)forming a slurry that shows no separation between constituent particles by mixing pore precursor and ceramic powder in the presence of liquid medium, (b)producing the molded composite body of ceramic powder/pore precursor powder by moulding said slurry, (c)casting off and sintering said molded composite body. In the present invention, hollow spherical pore polymeric particles are used as a pore precursor, thereby controlling the structure of pore size and condition.
Abstract translation: 多孔陶瓷是通过（a）在液体介质的存在下，通过混合孔前体和陶瓷粉末形成不构成颗粒分离的浆料，（b）通过模塑生产陶瓷粉末/孔前体粉末的模制复合体 所述浆料，（c）脱模并烧结所述模制复合体。 在本发明中，使用空心球形孔聚合物颗粒作为孔前体，从而控制孔径和状态的结构。
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公开(公告)号：KR1019960012714B1
公开(公告)日：1996-09-24
申请号：KR1019940015129
申请日：1994-06-29
Applicant: 한국과학기술연구원
IPC: C04B14/38
CPC classification number: C04B35/645 , C04B35/803
Abstract: The ceramic composites is prepared by adding about 0.4-1.0 wt.% a basic polymer, polyvinylalcohol(PVA) to a heat-treated SiC whisker to obtain a SiC whisker slurry, mixing the SiC whisker slurry with a ceramic matrix slurry formed at about pH 4 followed by freeze-drying the resulting slurry mixture to produce granules having a uniform packing structure and hot pressing the granules. The composite can be used as high temperature structural material, as well as cutting tools.
Abstract translation: 通过向热处理的SiC晶须中加入约0.4-1.0重量％的碱性聚合物，聚乙烯醇（PVA）以获得SiC晶须浆料，将SiC晶须浆料与形成在约pH下的陶瓷基体浆料混合来制备陶瓷复合材料 4，然后将得到的浆料混合物冷冻干燥，得到具有均匀包装结构并热压颗粒的颗粒。 该复合材料可用作高温结构材料，以及切削工具。
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