公开(公告)号：KR1020030024381A

公开(公告)日：2003-03-26

申请号：KR1020010057507

申请日：2001-09-18

Applicant: 한국과학기술연구원

Inventor： 배동식 ,  한경섭 ,  김창삼 ,  김대준

IPC: B22F1/00

Abstract: PURPOSE: A synthesizing method of fine powder of copper using organic solvent is provided to directly prepare copper powder without reduction treatment by inducing reaction of organic solvent at proper temperature and pressure. CONSTITUTION: The synthesizing method of fine powder of copper using organic solvent comprises the processes of preparing copper hydroxide sediment by reacting a copper precursor aqueous solution with a neutralizer selected from calcium hydroxide (KOH), sodium hydroxide (NaOH) and ammonium hydroxide (NH4OH); and reacting the mixed solution at a temperature of 200 to 300 deg.C for 0.5 to 20 hours after dissolving the sediment into an organic solvent, wherein the copper precursor is at least one or more precursors selected from copper nitrate hydride (Cu(NO3)2·xH2O), copper chloride dehydride (CuCl2·2H2O), copper sulfide pentahydride (CuSO4·5H2O) and copper sulfide hydride (CuSO4·xH2O), wherein the organic solvent is at least one or more solvents selected from ethylene glycol, di(ethylene glycol), polyethylene glycol and butanediol, and wherein centrifuge method is used to recover the obtained copper fine powder.

Abstract translation: 目的：提供使用有机溶剂的铜精细合成方法，通过在适当的温度和压力下引发有机溶剂的反应直接制备铜粉而不进行还原处理。 构成：使用有机溶剂的铜精细合成方法包括通过使铜前体水溶液与选自氢氧化钙（KOH），氢氧化钠（NaOH）和氢氧化铵（NH 4 OH）的中和剂反应制备氢氧化铜沉淀物的方法， ; 在将沉淀物溶解在有机溶剂中后，在200〜300℃的温度下使混合溶液反应0.5〜20小时，其中铜前体是至少一种或多种选自硝酸铜（Cu（NO 3） 2·xH2O），氯化铜酐（CuCl2·2H2O），硫化铜五氢化物（CuSO4·5H2O）和硫化铜氢化物（CuSO4·xH2O），其中有机溶剂为选自乙二醇，二 乙二醇），聚乙二醇和丁二醇，其中使用离心法回收得到的铜精细粉末。

公开(公告)号：KR1020000073206A

公开(公告)日：2000-12-05

申请号：KR1019990016356

申请日：1999-05-07

Applicant: 한국과학기술연구원

Inventor： 김대준 ,  이득용 ,  장주웅

IPC: C04B35/48

CPC classification number: C04B35/4885

Abstract: PURPOSE: Tetragonal zirconia powder, tetragonal zirconia/alumina composite and a manufacturing method thereof are provided for having high strength and strong toughness without happening low temperature deterioration. CONSTITUTION: Tetragonal zirconia powder in the composite limit of a triangle drawn by three composite points. The three points are 92 mol% ZrO2-4 mol% Y2O3-4 mol% Nb2O5 (or Ta2O5), 89 mol% ZrO2-7 mol%-4 mol% Nb2O5 (or Ta2O5) and 86 mol% ZrO2-7 mol% Y2O3-7 mol% Nb2O5 (or Ta2O5) in a three-component system of ZrO2-Y2O3-Nb2O5 or Ta2O3. Tetragonal zirconia/alumina composite contains 5-50%(v/v) of alumina with the tetragonal zirconia powder. A hot isostatic press method is used for sintering by raising the temperature at 10°C/min. up to 1300-1700°C and keeping the temperature for 1-10 hours. A high-pressure sintered sample is sintered by hot isostatic press for 10 min to 2 hours at 2-200 MPa.

Abstract translation: 目的：提供四方氧化锆粉末，四方晶氧化锆/氧化铝复合物及其制造方法，其具有高强度和强韧性而不发生低温劣化。 构成：三角形氧化锆粉末在由三个复合点绘制的三角形的复合极限中。 三个点为92mol％ZrO 2 -4mol％Y 2 O 3 -4mol％Nb 2 O 5（或Ta 2 O 5），89mol％ZrO 2 -7mol％-4mol％Nb 2 O 5（或Ta 2 O 5）和86mol％ZrO 2 -7mol％Y 2 O 3 在ZrO2-Y2O3-Nb2O5或Ta2O3的三组分体系中为-7mol％的Nb2O5（或Ta2O5）。 四方晶氧化锆/氧化铝复合材料含有5-50％（v / v）氧化铝和四方晶氧化锆粉末。 通过以10℃/分钟的温度升高，采用热等静压法进行烧结。 高达1300-1700°C，保持1-10小时。 高压烧结样品通过热等静压机在2-200MPa下烧结10分钟至2小时。

公开(公告)号：KR100203378B1

公开(公告)日：1999-06-15

申请号：KR1019960037493

申请日：1996-08-31

Applicant: 한국과학기술연구원 ,  이명범

Inventor： 김대준 ,  이명현

IPC: A61K6/02

CPC classification number: C04B35/803 ,  A61C13/0003 ,  A61K6/0008 ,  A61K6/0215 ,  A61K6/024 ,  A61K6/025 ,  A61K6/0255 ,  A61K6/083 ,  C04B35/111 ,  C04B35/119 ,  C04B35/443 ,  C04B35/62218 ,  C08L29/14

Abstract: An improved method for simplifying a slip casting applied conventional all ceramic core molding process by molding an all ceramic core from a ceramic sheet. In the method, there is prepared a slurry which consists mainly of alumina, spinel, alumina/zirconia powder, by adding thereto a dispersant, a binding agent, a plasticizer, a solvent and the like. The slurry is formed into a sheet having a thickness of 0.1mm to 1.0mm for thereby fabricating a tooth molding mass by using a heat hydrostatic pressing at a pressure of 15 Kgf/cm to 150 Kgf/cm at a temperature of 50 DEG C to 110 DEG C, with slurry composition for fabricating an all ceramic jacket crown applicable to an artificial crown comprises.

公开(公告)号：KR1019950026845A

公开(公告)日：1995-10-16

申请号：KR1019940005128

申请日：1994-03-15

Applicant: 한국과학기술연구원

Inventor： 김대준 ,  정형진 ,  장주웅 ,  문지웅

IPC: C04B35/48

Abstract: 본 발명은 고인성ㆍ내저온열화 특성을 갖는 정방성 지르코니아 복합체의 제조방법에 관한 것이다. 본 발명은 88~90mol% ZrO
2 , 5~7mol% Y
2 O
3 , 3~6mol% Nb
2 O
5 나 Ta
2 O
5 로 이루어진 비전이성 TZP 또는 82~86mol% ZrO
2 에 Y
2 O
3 와 Nb
2 O
5 나 Nb
2 O
5 가 각각 7~9mol% 첨가되어 이루어진 비전이성 TZP에 93~97mol% ZrO
2 , 2~4mol% Y
2 O
3 , 1~3mol% Nb
2 O
5 나 Ta
2 O
5 로 이루어진 전이성 TZP 60wt% 이하로 혼합하여 소결하는 방법이다. 본 발명의 방법에 의해 제조된 TZP 복합체는 100~400℃의 저온영역에서 장시간 노출시에도 단사장 지르코니아로의 상전이에 의한 저온열화를 나타내지 않으면서도 고인성을 나타내는 장점이 있다.