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1. 发明专利

JPH0833650A DENTAL ORTHODONTIC BRACKET AND ITS PRODUCTION 失效
公开(公告)号：JPH0833650A
公开(公告)日：1996-02-06
申请号：JP16945294
申请日：1994-07-21
申请人： SHINAGAWA REFRACTORIES CO , HOYA CORP
发明人： YOSHIDA MASAHIRO , TANJI HIROAKI , AYUSAWA NOBUO , NAKAYAMA SUSUMU , HINO TAKASHI
IPC分类号： A61C7/14 , A61C7/28 , C04B35/48
摘要： PURPOSE:To provide a dental orthodontic bracket consisting of the sintered compact of partially stabilized zirconia having an excellent aesthetic characteristic, high strength, high toughness and excellent thermal stability. CONSTITUTION:This dental orthodontic bracket consists of the sintered compact of the partially stabilized zirconia which consists essentially of ZrO2, is stabilized with one or >=2 kinds of rare earth metal oxides selected from a group consisting of Gd2O3, Yb2O3, Ho2O3 and Dy2O3 or is stabilized by this rare earth metal oxides and/or La2O3 and Y2O3 and in which the ratio of the Y2O3 in the stabilizing agents is 30 to 70mol%. The raw material powder is molded and the molding is sintered at 1200 to 1450 deg.C. Then, the bracket shaped to have the good operability approximate to the operability of a metallic bracket is thus obtd. without any restriction in design. The deterioration in the strength does not arise even if the bracket is subjected to the surface treatment for the purpose of improving the adhesive. Coloration to the color tones approximate to the color tones of the natural teeth is possible and the aesthetic characteristic is excellent.

2. 发明专利

JPH0833701A ZIRCONIA MEDICAL MATERIAL AND MANUFACTURE THEREFOR 失效
公开(公告)号：JPH0833701A
公开(公告)日：1996-02-06
申请号：JP16945394
申请日：1994-07-21
申请人： SHINAGAWA REFRACTORIES CO , HOYA CORP
发明人： AYUSAWA NOBUO , ICHIMORI TERUMITSU , MINO TADAHIRO , NAKAYAMA SUSUMU , YOSHIDA MASAHIRO , TANJI HIROAKI
IPC分类号： A61L27/00 , A61K6/027 , A61L31/00 , C04B35/48
摘要： PURPOSE:To provide a zirconia-based medical material which has high mechanical properties and is excellent in heat stability. CONSTITUTION:A zirconia-based medical material is composed mainly of ZrO2 and contains at least one kind selected from Yb2O3, Er2-O3, Ho2O3, Y2O3, and Dy2O3, a boron compound, and further Al2O3, and SiO2. Further, at least one kind selected from La2O3, Pr2O11/2, Nd2O3, Sm2O3 and Gd2O3 may be used jointly. A raw material obtained from the above composition by an oxide mixing method is calcined at 500-1200 deg.C and then sintered at 1500-1700 deg.C.

3. 发明专利

JPH08208333A CONDUCTIVE MATERIAL FOR OXYGEN ION AND ITS PRODUCTION 失效
公开(公告)号：JPH08208333A
公开(公告)日：1996-08-13
申请号：JP4125395
申请日：1995-02-06
申请人： SHINAGAWA REFRACTORIES CO
发明人： NAKAYAMA SUSUMU
IPC分类号： G01N27/409 , C04B35/50 , H01M8/02 , H01M8/10
摘要： PURPOSE: To obtain a conductive material for oxygen ion having a small activation energy and high oxygen ion conductivity at low temp. by using specified compd. as the main component and forming a hexagonal crystal structure as the main structural phase of a sintered compact. CONSTITUTION: This conductive material for oxygen ion is obtd. by mixing La2 O3 , Ce2 O3 , Pr2 O3 , Nd2 O3 , Sm2 O3 , Eu2 O3 , Gd2 O3 , Tb2 O3 , Dy2 O3 as the source material of rare earth elements and precipitated silica, silica gel, crystalline silica, or the like as the source material of SiO2 in a specified proportion, kneading the mixture in an alcohol by using a ball mill, drying, calcining at 1000 deg.C, pulverizing the calcined material, and then sintering at 1300-1700 deg.C. The conductive material for oxygen ion consists essentially of Lnx Si6 O(3x/2)+12 , wherein Ln is tervalent rare earth element such as La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy and x ranges 6

4. 发明专利

JPH07187774A HIGH-STRENGTH SINTERED ZIRCONIA MATERIAL, ITS PRODUCTION, MATERIAL FOR CRUSHING PART AND CERAMIC DIE 失效
公开(公告)号：JPH07187774A
公开(公告)日：1995-07-25
申请号：JP32708193
申请日：1993-12-24
申请人： SHINAGAWA REFRACTORIES CO
发明人： MINO TADAHIRO , ICHIMORI TERUMITSU , NAKAYAMA SUSUMU , AYUSAWA NOBUO
IPC分类号： B21C25/00 , B21C3/02 , B21D37/01 , C04B35/48
摘要： PURPOSE:To enable the supply of a sintered ZrO2 material having remarkably high strength at a low cost and to produce a material for a crushing part having high strength, toughness, abrasion resistance, heat stability and crushing efficiency and a ceramic die made of the material. CONSTITUTION:This sintered ZrO2 material is composed mainly of ZrO2 and contains one or more kinds of rare earth metal oxide (R1) selected from La2O3, Pr2O11/3, Nd2O3, Sm2O3 and Gd2O3, one or more kinds of rare earth metal oxide (R2) selected from Y203, Yb2O3, Ho2O3, Er2O3 and Dy2O3 and 0.05-2wt.% Of B2O3. The material can be produced by mixing these oxides at the above ratios, calcining the mixture at 500-1200 deg.C and sintering at 1300-1600 deg.C. The crushing part material and ceramic die is composed of sintered ZrO2 material having an R2O3(R1+R2)/ZrO2 ratio of 2/98 to 6/94, containing the crystal particles composed mainly of tetragonal crystal or a mixed phase of tetragonal crystal and cubic crystal and having an average crystal particle diameter of =5.8g/cm .

5. 发明专利

JPH06305829A SINTERED ZIRCONIA MATERIAL AND ITS PRODUCTION 失效
公开(公告)号：JPH06305829A
公开(公告)日：1994-11-01
申请号：JP9936793
申请日：1993-04-26
申请人： SHINAGAWA REFRACTORIES CO
发明人： ICHIMORI TERUMITSU , NAKAYAMA SUSUMU , AYUSAWA NOBUO
IPC分类号： C04B35/48
摘要： PURPOSE:To improve the strength and thermal shock resistance while keeping the characteristic breaking toughness of a CeO2-based ZrO2 by adding specific amounts of Al2O3, SiO2 and B203 to ZrO2 containing a specific amount of CeO2. CONSTITUTION:This zirconia-based sintered material contains a main component composed mainly of ZrO2 and 10-20mol% of CeO2 and a subsidiary component consisting of 0.1-10wt.% of Al2O3 and 0.05-0.5wt.% each of SiO2 and B2O3. The sintered product is produced by forming the raw material powder and sintering at 1400-1600 deg.C. When the CeO2 content is less than 10mol%, a stable ZrO2 cannot be obtained and crack is generated in the sintered product. The characteristic breaking toughness of the CeO2-based ZrO2 is unattainable at a CeO2 content of >20mol%. Al2O3 and SiO2 are effective for improving the strength and the effect is further promoted by the combined use of both components. The effect cannot be attained when the amount of each component is less than the respective lower limit. On the contrary, the addition of the component exceeding the upper limit causes the lowering of strength. B2O3 has an effect to improve the thermal shock resistance. It is necessary to add B2O3 in an amount exceeding the lower limit, however, strength is lowered when the amount exceeds the upper limit.

6. 发明专利

JPH06135722A METHOD FOR SYNTHESIZING MULTIPLE OXIDE OF RARE EARTH ELEMENT AND OTHER ELEMENT 失效
公开(公告)号：JPH06135722A
公开(公告)日：1994-05-17
申请号：JP18851793
申请日：1993-07-29
申请人： SHINAGAWA REFRACTORIES CO
发明人： NAKAYAMA SUSUMU , AYUSAWA NOBUO , SAKAMOTO MASAOMI , SADAOKA YOSHIHIKO
IPC分类号： C01G37/00 , C01C3/11 , C01F17/00 , C01G45/00 , C01G49/00 , C01G51/00 , H01M4/90
摘要： PURPOSE:To obtain multiple oxide of a rare earth element and other element having a small particle diameter and a uniform compsn. CONSTITUTION:A soln. of an alkali metal salt of a hexacyano complex contg. Cr, Mn, Fe or Co such as K3[Fe(CN)6] and a soln. of a salt of a rare earth element selected among Sc, Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu are brought into an ion exchange reaction and the resulting hexacyano complex contg. the rare earth element and Cr, Mn, Fe or Co such as La[Fe(CN)6].5H2O is thermally decomposed in an oxygen-contg. atmosphere to obtain the objective multiple oxide of a rare earth element and other element.

7. 发明专利

JPH0840770A ZIRCONIA SINTERED PRODUCT AND METHOD FOR PRODUCING THE SAME 失效
公开(公告)号：JPH0840770A
公开(公告)日：1996-02-13
申请号：JP19793894
申请日：1994-07-30
申请人： SHINAGAWA REFRACTORIES CO
发明人： NAKAYAMA SUSUMU , MINO TADAHIRO , SHIKAMA HIROYUKI , AYUSAWA NOBUO
IPC分类号： C04B35/48
摘要： PURPOSE:To provide a rare earth metal oxide-stabilized zirconia sintered product excellent in thermal impact resistance, especially in rapid heating impact resistance up to 1800 deg.C, and having good thermal stability and high mechanical characteristics, and to provide a method for producing the same. CONSTITUTION:The zirconia sintered product is obtained by sintering a raw material composition comprising ZrO2 composing vaterite as a main component, the below-described amount of one or more rare earth metal oxides selected from Nd2O3, Sm2O3, Gd2O3, Dy2O3, Y2O3, Ho2O3, Er2O3and Yb2O3, the below- described amounts of Al2O3 and SiO2, and, if necessary, further the below- described amount of a boron compound at a prescribed temperature (1400-1700 deg.C). The molar ratio of R2O3/ZrO2:1/99 to 5/95; the content of Al2 O3:0.05-20mol.%; the content of SiO2:0.05-10mol.%; the content of the boron compound : 0.05-10mol.% converted into boron (B).

8. 发明专利

JPH0812426A ZIRCONIC SINTERED COMPACT AND ITS PRODUCTION 失效
公开(公告)号：JPH0812426A
公开(公告)日：1996-01-16
申请号：JP17025094
申请日：1994-06-29
申请人： SHINAGAWA REFRACTORIES CO
发明人： MINO TADAHIRO , ICHIMORI TERUMITSU , NAKAYAMA SUSUMU
IPC分类号： C04B35/48
摘要： PURPOSE:To provide a zirconic sintered compact using Nd2O3 as a stabilizer, and to provide a method for producing the same. CONSTITUTION:The zirconic sintered compact contains ZrO2 as a main component, and Nd2O3, Al2O3 and SiO2 as stabilizers, or contains further a boron compound. Therein, the molar ratio of the Nd2O3/ZrO2 is 1/99 to 5/95, and the Al2O3, the SiO2 and the boron compound are added in amounts of 0.1-5mol.%, 0.05-1.5mol.% and 0.05-8mol.% (in terms of boron), respectively. The method for producing the zirconic sintered product comprises preparing such a raw material compound as giving the composition of the zirconic sintered product, calcining the compound at 500-1200 deg.C, grinding the calcined product, molding the raw material powder, and subsequently sintering the molded product at 1300-1650 deg.C. Thereby, the zirconic sintered compact excellent in thermal stability and mechanical characteristics can be provided. Especially, the zirconic sintered compact substantially not causing the deterioration of the sintered compact even when used for a long time in the atmosphere, water or steam at 200-300 deg.C can be provided.

9. 发明专利

JPH06329468A SINTERED ZIRCONIA AND ITS PRODUCTION 失效
公开(公告)号：JPH06329468A
公开(公告)日：1994-11-29
申请号：JP12143493
申请日：1993-05-24
申请人： SHINAGAWA REFRACTORIES CO
发明人： NAKAYAMA SUSUMU , ICHIMORI TERUMITSU , AYUSAWA NOBUO
IPC分类号： C04B35/48
摘要： PURPOSE:To obtain a stabilized sintered zirconia material having excellent thermal shock resistance and mechanical properties by adding La2O3, Pr2O11/3 or Nd2O3 to a zirconia composition containing Ln, Ho, Er or Yb and sintering the mixture. CONSTITUTION:This sintered zirconia material is produced by adding 0.01-0.5mol% of one or more substances selected from La2O3, Pr2O11/3 and Nd2O3 as a property-improving agent to a zirconia composition having an Ln2O3/ZrO2 molar ratio of 2/98 to 6/94 (Ln is Dy, Ho, Er or Yb). This zirconia composition may be incorporated with

10. 发明专利

JPH04177804A POSITIVE CHARACTERISTIC THERMISTOR AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH04177804A
公开(公告)日：1992-06-25
申请号：JP30674190
申请日：1990-11-13
申请人： SHINAGAWA REFRACTORIES CO
发明人： KUROSHIMA HIROSHI , NAKAYAMA SUSUMU , ICHIMORI TERUMITSU , KIKUZAWA MASANAGA
IPC分类号： C04B35/46 , H01C7/02
摘要： PURPOSE:To contrive an increase in the temperature coefficient of resistance of a positive characteristic thermistor and the rate of change of resistance of the thermistor without changing the basic electrical characteristics of the thermistor by a method wherein a small amount of tin or selenium is added to the temporarily sintered powder of a composition consisting of barium titanate obtainable by replacing one part of barium with strontium and after they are mixed, the mixture is molded and sintered. CONSTITUTION:0.0005mol or less of tin or selenium is added to one mol of the temporarily sintered powder of a composition for positive characteristic(PTC) thermistor use, which consists of barium titanate ((Ba, Sr)TiO3) obtainable by replacing one part of barium with strontium, and after they are mixed, the mixture is molded and the molded product is fired in the atmosphere. Thereby, the temperature coefficient of resistance of the thermistor and the rate of change of resistance of the thermistor can be increased without changing the ratio of basic components of the PTC thermistor, by which a nominal resistance value of zero load specifying the field of use of the PTC thermistor is made to fluctuate.

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