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公开(公告)号：KR1020020067257A
公开(公告)日：2002-08-22
申请号：KR1020010007749
申请日：2001-02-16
Applicant: 한국에너지기술연구원
IPC: C04B35/573
CPC classification number: C04B35/573 , C04B35/563 , C04B35/62695 , C04B35/64 , C04B2235/3821 , C04B2235/3826
Abstract: PURPOSE: A method for manufacturing silicon carbide-boron carbide composites by liquid phase reaction sintering is provided which can compensate strength/hardness reduction due to free silicone in silicon carbide-boron carbide composite produced by liquid phase reaction sintering. CONSTITUTION: The manufacturing method of silicon carbide-boron carbide composites by liquid phase reaction sintering includes the steps of (i) adding 5-40 wt.% of boron carbide(B4C) to an admixture comprising 80-95 wt.% silicon carbide and 5-20 wt.% carbon powder followed by mixing, wherein the silicon carbide is composed of coarse particle and fine particle in a ratio of 7:3, and the carbon powder is carbon black having mean particle size of less than 1μm; (ii) adding 1-2 wt.% of organic binder to the mixture obtained in the first step followed by granulating above mixture with a sieve having 50-100 mesh size; (iii) pressing the granulated mixture by uniaxial pressing at 300-500Kg/cm¬2; and (iv) sintering process. The sintering process is characterized in that above formed mixture is heated up to 600 deg.C at a temperature rising rate of 1 to 2 deg.C/min under decompressed atmosphere of 10¬-1 to 10¬-2 torr and then holding the temperature for 1 hour; sequentially it is heated to temperature ranges of 1,550 to 1,600°C at a temperature rising rate of 5 deg.C/min and then holding the temperature for a certain period of time; and finally it is heated up to 1,700°C.
Abstract translation: 目的：提供一种通过液相反应烧结制造碳化硅 - 碳化硼复合材料的方法，其可以补偿由液相反应烧结制备的碳化硅 - 碳化硼复合材料中的游离硅氧烷的强度/硬度降低。 构成：通过液相反应烧结制造碳化硅 - 碳化硼复合材料的方法包括以下步骤：（i）将5-40重量％的碳化硼（B4C）加入到包含80-95重量％的碳化硅和 5-20重量％的碳粉末，然后混合，其中碳化硅由比例为7:3的粗颗粒和细颗粒组成，碳粉是平均粒度小于1μm的炭黑; （ii）在第一步骤中获得的混合物中加入1-2重量％的有机粘合剂，然后用具有50-100目尺寸的筛子将上述混合物造粒; （iii）以300-500Kg / cm 2的单轴压制压制造粒混合物; 和（iv）烧结工艺。 烧结过程的特征在于，将上述形成的混合物在10-1-10 -2托的减压气氛下以1至2℃/ min的升温速率加热至600℃，然后将 温度1小时; 依次加热至1550〜1600℃的温度范围，升温速度为5℃/分钟，然后保温一定时间; 最后加热到1700℃。
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公开(公告)号：KR100308922B1
公开(公告)日：2002-04-24
申请号：KR1019980049980
申请日：1998-11-20
Applicant: 한국에너지기술연구원
IPC: C04B35/584 , C04B35/565
Abstract: 본 발명은 내열충격성과 내식성 및 강도특성이 우수하여 고로용과 금속 용탕용의 내식성 내화재료등에 사용될 수 있도록 실리콘의 질화반응에 의하여 질화규소 결합 탄화규소계 복합재료의 제조방법에 관한 것이다. 종래의 질화규소 결합 탄화규소계 복합재료의 제조방법에 있어서 질화반응의 불균일에 의한 잔류 실리콘의 과다 존재와 이로 인한 소결체의 밀도, 강도 및 내식성이 저하되고 장시간의 질화반응으로 인해 생산단가가 높아지지만 본 발명은 핵형성제를 사용하여 이러한 문제점을 해결하였다.
본 발명의 복합재료는 60∼90중량%의 탄화규소와 10∼40중량%의 실리콘 그리고 핵형성제로 1∼5중량%의 질화규소를 기본 조성물로 하였다. 이들 조성물에 유기바인더를 결합제로 혼합해서 일정 형상으로 성형하고 건조시킨 후, 질소 분위기와 900℃ 온도범위에서 2∼5시간 동안 예비 열처리하여 바인더를 제거한 후, 1,300∼ 1,450℃ 온도범위에서 1∼30시간 동안 소결하여 실리콘의 질화반응을 균일하게 촉진시켜 질화규소로 존재시키고, 잔류하는 실리콘량을 최소화하여 5OMPa 이상의 고강도를 나타내는 질화규소 결합 탄화규소계 복합재료를 제조하는데 있다.-
公开(公告)号：KR100299099B1
公开(公告)日：2001-09-13
申请号：KR1019990015659
申请日：1999-04-30
Applicant: 한국에너지기술연구원
IPC: C04B35/565 , C04B35/573
Abstract: 본발명은액상반응소결(Liquid Phase Reaction Sintering)법과탄화규소 (SiC) 세라믹스를이용하여화학펌프, 마그네틱펌프및 송풍기에사용하는세라믹밀봉재(Ceramics Seal)의제조방법에관한것이다. 본발명은 95∼85 중량의탄화규소에 5∼15 중량의탄소를기본조성으로하여유기바인더를성형보조제로첨가하고이들을혼합하여실온에서 800℃까지 1∼2℃/분의느린속도로승온시켜성형체에결함이생성시키지않도록하고바인더를제거하기위하여열처리한후, 1,600∼1,700℃의온도범위에서 0.5∼1시간동안반응소결하여탄화규소세라믹밀봉재를제조한다. 본발명은기공이없이치밀하며, C-ring 강도 400 MPa 이상, 경도 2,000 kg/mm이상을갖는탄화규소세라믹밀봉재소결체의제조하는것을목적으로한다.
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公开(公告)号：KR1020000067656A
公开(公告)日：2000-11-25
申请号：KR1019990015659
申请日：1999-04-30
Applicant: 한국에너지기술연구원
IPC: C04B35/565 , C04B35/573
CPC classification number: C04B35/64 , B28B1/265 , C04B35/573 , C04B35/632 , C04B2235/422 , C04B2235/656
Abstract: PURPOSE: A manufacturing method of SiC ceramic seal by liquid phase reaction sintering is provided, which gives excellent abrasion-resistance, hardness and heat-resistance. CONSTITUTION: The manufacturing method of SiC ceramic seal comprises the steps of: preparing 85-95 wt.% of SiC powders containing coarse and fine powders and 5-15 wt.% of C powders containing graphite and carbon black powders and then vibration pot milling for 30 min.; mixing with 1-2 wt.% (based on the weight of mixed SiC+C powders) of an organic binder such as carboxymethyl cellulose (CMC) or polyvinyl pyrollidone (PVP); forming with 300-500 kg/cm¬2 by uniaxial pressing; heat treating at 800°C for 1 hour; sintering it up to 1550-1600°C elevating by 5°C/min and then maintaining the temperature for 1 hour. The sintered ceramic seal having more than 400 MPa of C-ring strength and more than 2000 kg/mm2 of hardness is used for chemical pumps, magnetic pumps and fans.
Abstract translation: 目的：提供通过液相反应烧结制造SiC陶瓷密封的方法，具有优异的耐磨性，硬度和耐热性。 构成：SiC陶瓷密封件的制造方法包括以下步骤：制备85-95重量％的含有粗粉末和细粉末的SiC粉末和5-15重量％的含石墨和炭黑粉末的C粉末，然后振动锅铣 30分钟。 与有机粘合剂如羧甲基纤维素（CMC）或聚乙烯基吡咯烷酮（PVP）的1-2重量％（基于混合SiC + C粉末的重量）混合; 通过单轴压制成型为300-500kg / cm 2; 在800℃下热处理1小时; 将其烧结至1550-1600℃，升高5℃/ min，然后保持温度1小时。 具有超过400MPa的C环强度和大于2000kg / mm 2的硬度的烧结陶瓷密封件用于化学泵，磁力泵和风扇。
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