公开(公告)号：US06995106B2

公开(公告)日：2006-02-07

申请号：US10194941

申请日：2002-07-15

申请人： Takashi Oba ,  Masahiko Matsumiya ,  Akifumi Tosa ,  Kazuhisa Itakura

发明人： Takashi Oba ,  Masahiko Matsumiya ,  Akifumi Tosa ,  Kazuhisa Itakura

IPC分类号： C04B35/495

CPC分类号： C04B35/638 ,  C01G9/006 ,  C01G33/006 ,  C01G35/006 ,  C01G51/006 ,  C01P2002/52 ,  C01P2002/72 ,  C01P2002/74 ,  C01P2004/50 ,  C01P2006/10 ,  C04B35/495 ,  C04B35/62655 ,  C04B35/62695 ,  C04B2235/3201 ,  C04B2235/3203 ,  C04B2235/3206 ,  C04B2235/3215 ,  C04B2235/3251 ,  C04B2235/3258 ,  C04B2235/3262 ,  C04B2235/3272 ,  C04B2235/3275 ,  C04B2235/3284 ,  C04B2235/421

摘要： A dielectric ceramic material is represented by the following compositional formula, (100-a)[Bau{(ZnvCo1-v)wNbx}Oδ1]-a[MyTazOδ2], where M represents at least one species selected from K, Na, and Li. In one method, the dielectric material is produced by mixing raw material powders such that proportions by mol of component metals simultaneously satisfy the relations, 0.5≦a≦25; 0.98≦u≦1.03; 0≦v≦1; 0.274≦w≦0.374; 0.646≦x≦0.696; 0.5≦y≦2.5; and 0.8≦z≦1.2. The method further includes subjecting the resultant mixture to primary pulverization; calcining the resultant powder at 1,100-1,300° C., followed by wet secondary pulverization; drying the resultant paste; granulating; molding the resultant granules to thereby yield a compact; and firing the compact in air advantageously at 1,400-1,600° C.

摘要翻译： 电介质陶瓷材料由以下组成式表示：（100-a）[Ba u> w w SUB SUB SUB SUB SUB SUB SUB SUB > N + 1 + 1 + 1 + 1 + 1 + 1 + 1/2 + >]，其中M表示选自K，Na和Li中的至少一种。 在一种方法中，电介质材料通过混合原料粉末来制备，使得摩尔比例的组分金属同时满足关系，0.5≤a≤25; 0.98 <= u <= 1.03; 0 <= v <= 1; 0.274 <= w <= 0.374; 0.646 <= x <= 0.696; 0.5 <= y <= 2.5; 和0.8 <= z <= 1.2。 该方法还包括将所得混合物进行一次粉碎; 在1100-1300℃下煅烧所得粉末，然后进行湿二次粉碎; 干燥所得糊状物; 制粒 将得到的颗粒成型，从而得到成型体; 并且在空气中有利地在1400-1,600℃下烧制压块。

公开(公告)号：US6159885A

公开(公告)日：2000-12-12

申请号：US998384

申请日：1997-12-24

申请人： Ken-ichi Mizuno ,  Yoshihiro Yamamoto ,  Toru Shimamori ,  Kazuhisa Itakura

发明人： Ken-ichi Mizuno ,  Yoshihiro Yamamoto ,  Toru Shimamori ,  Kazuhisa Itakura

IPC分类号： C04B35/10 ,  C04B35/111

CPC分类号： C04B35/111

摘要： A homogeneous alumina-based sintered material having excellent grindability, low porosity and high flexural strength, and which is free of color unevenness and fluctuations in density. Predetermined amounts of Al.sub.2 O.sub.3 powder, MgO powder, CaCO.sub.3 powder and SiO.sub.2 powder are measured out, and then mixed with stirring in a ball mill. The mixture is granulated using a spray dryer, and then hydrostatically pressed to obtain a molded product having a predetermined shape. Subsequently, the molded product is stored and sintered at a temperature of 1,550.degree. C. to 1,650.degree. C., particularly 1,600.degree. C. to 1,650.degree. C. under atmospheric pressure for 2 hours. As a result, an alumina-based sintered material having a 50 percent cumulative grain size distribution in diameter of from 4 to 15 .mu.m, a 90 percent grain diameter of two to three times the 50 percent grain diameter, and a porosity of not more than 5% can be obtained. The alumina-based sintered material thus obtained exhibits a maximum load current during grinding of not more than 1.0 A/mm, particularly not more than 0.5 A/mm, and a four-point flexural strength of not less than 300 MPa, thus providing excellent grindability as well as high strength.

摘要翻译： 均匀的氧化铝基烧结体，其研磨性，孔隙率低，弯曲强度高，无颜色不均匀，密度波动。 测定预定量的Al 2 O 3粉末，MgO粉末，CaCO 3粉末和SiO 2粉末，然后在球磨机中搅拌混合。 使用喷雾干燥器将混合物造粒，然后进行水压加压，得到具有预定形状的成型体。 随后，在大气压下将成型产物在1550℃至1650℃，特别是1600℃至1650℃的温度下储存和烧结2小时。 结果，直径为4〜15μm的累积粒径分布为50％，90％粒径为50％晶粒直径2〜3倍的氧化铝系烧结体，不具有孔隙率 超过5％可以获得。 由此得到的氧化铝系烧结体在研磨时的最大负载电流为1.0A / mm以下，特别优选为0.5A / mm以上，4点弯曲强度为300MPa以上，因此提供优异的 可磨性以及高强度。

公开(公告)号：US6069104A

公开(公告)日：2000-05-30

申请号：US332033

申请日：1999-06-14

申请人： Yuji Yasunishi ,  Kazuhisa Itakura

发明人： Yuji Yasunishi ,  Kazuhisa Itakura

IPC分类号： C04B35/00 ,  C04B35/457 ,  C04B35/46 ,  C04B35/462 ,  H01B3/12 ,  H01P7/10 ,  C04B35/465

CPC分类号： C04B35/462 ,  C04B35/457 ,  H01P7/10

摘要： A microwave dielectric porcelain composition having a composition represented by the formula xTiO.sub.2 -ySnO.sub.2 -zMgO, wherein x, y and z each represents an axis of mol-% in a triangular diagram, the sum of x, y and z being 100 mol-%, a pentagonal region is formed by sequentially connecting points P (x=59, y=11, z=30 ), Q (x=63, y=11, z=26), R (x=22.5, y=77.5, z=0), S (x=2, y=98, z=0), T (x=4, y=90, z=6) and P, and the formula is defined to be within the PQ, QR, ST and TP sides, but not defined by the RS side, of the pentagonal region.

摘要翻译： 具有由式xTiO2-ySnO2-zMgO表示的组成的微波介电瓷组合物，其中x，y和z各自表示三角形图中的mol-％轴，x，y和z的和为100mol％ 通过顺序连接点P（x = 59，y = 11，z = 30），Q（x = 63，y = 11，z = 26），R（x = 22.5，y = z = 0），S（x = 2，y = 98，z = 0），T（x = 4，y = 90，z = 6）和P，公式定义为PQ， ST和TP侧，但不是由RS侧定义的五边形区域。

公开(公告)号：US07094720B2

公开(公告)日：2006-08-22

申请号：US10394645

申请日：2003-03-24

申请人： Takashi Oba ,  Hisashi Koduka ,  Kazuhisa Itakura

发明人： Takashi Oba ,  Hisashi Koduka ,  Kazuhisa Itakura

IPC分类号： C04B35/495

CPC分类号： H01P7/10 ,  C01G9/006 ,  C01G33/006 ,  C01G35/006 ,  C01P2006/40 ,  C01P2006/80 ,  C04B35/453 ,  C04B35/495 ,  C04B35/63 ,  C04B35/634 ,  C04B2235/3215 ,  C04B2235/3251 ,  C04B2235/3275 ,  C04B2235/3279 ,  C04B2235/3284 ,  C04B2235/3294

摘要： A dielectric ceramic composition is provided which exhibits a high unloaded quality factor (Qu) and permits regulation of the relative dielectric constant (εr) and the temperature coefficient (τf) of resonance frequency (fo) within specific ranges in accordance with use or application of the composition. A dielectric resonator is also provided which includes a resonator main body formed from the composition. The dielectric ceramic composition contains, as metallic components, Ba, Zn, Nb, Ta, and Sb, and the amounts of the metallic components, as reduced to their oxides, satisfy the following relations expressed in mol %: 57.5≦BaO≦62.6; 16.0≦ZnO≦22.2; 0

摘要翻译： 提供一种电介质陶瓷组合物，其表现出高的无负载品质因数（Q OUT），并允许调节相对介电常数（ε）和温度系数（τ< 根据组合物的使用或应用，在特定范围内的共振频率（f 0）的共振频率。 还提供了一种介质谐振器，其包括由该组合物形成的谐振器主体。 电介质陶瓷组合物含有作为金属成分的Ba，Zn，Nb，Ta，Sb，还原为氧化物的金属成分的量满足以摩尔％表示的关系：57.5 <= BaO < 62.6; 16.0 <= ZnO <= 22.2; 0 2 <= 20.6; 0 2 <= 20.6; 和0 3 <= 5.9。

公开(公告)号：US06569796B2

公开(公告)日：2003-05-27

申请号：US09937501

申请日：2002-01-07

申请人： Kazuhisa Itakura ,  Takashi Oba ,  Akifumi Tosa ,  Kazushige Obayashi

发明人： Kazuhisa Itakura ,  Takashi Oba ,  Akifumi Tosa ,  Kazushige Obayashi

IPC分类号： C04B35495

CPC分类号： C04B35/453 ,  C04B35/495

摘要： The present invention is directed to a dielectric ceramic composition exhibiting a high unloaded quality factor and a small variation thereof. The dielectric ceramic composition of the invention containing Ba, Zn, and Ta, contains 100 parts by weight of a predominant component represented by xBaO—yZnO—(½)zTa2O5 (x, y, and z represent compositional proportions by mol and satisfy x+y+z=1), wherein x, y, and z fall within a quadrilateral region formed by connecting points A (x=0.503, y=0.152, z=0.345), B (x=0.497, y=0.158, z=0.345), C (x=0.503, y=0.162, z=0.335), and D (x=0.497, y=0.168, z=0.335) (sides AB, BD, DC, and CA being included) as shown in FIG. 1; 0.2-1.6 parts by weight K as reduced to K2O; and 0.7-8 parts by weight Ta as reduced to Ta2O5, wherein the ratio by weight of K to Ta falls within the range of 0.185-0.4. The dielectric resonator of the present invention is formed of the dielectric ceramic composition.

公开(公告)号：US06881694B2

公开(公告)日：2005-04-19

申请号：US10416764

申请日：2001-03-02

申请人： Toshihiro Mizui ,  Kazuhisa Itakura ,  Takuya Tarutani

发明人： Toshihiro Mizui ,  Kazuhisa Itakura ,  Takuya Tarutani

IPC分类号： C04B33/26 ,  H01B3/12 ,  C04B35/465

CPC分类号： H01B3/12 ,  C04B33/20 ,  C04B33/26 ,  C04B33/30 ,  C04B35/465 ,  C04B35/6262 ,  C04B35/62655 ,  C04B2235/3201 ,  C04B2235/3208 ,  C04B2235/3217 ,  C04B2235/3222 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3227 ,  C04B2235/3229 ,  C04B2235/3236 ,  C04B2235/3251 ,  C04B2235/3267 ,  C04B2235/604 ,  C04B2235/72 ,  C04B2235/79

摘要： The present invention relates to a microwave dielectric ceramic composition exhibiting excellent dielectric characteristics, including high Qu; and to a dielectric resonator which exhibits high Qu even when of large size. The present invention provides a microwave dielectric ceramic composition containing a primary component represented by CaTiO3-(1-x)REAlO3 [0.54≦x≦0.82] (wherein RE is composed only of an essential element La or composed of an essential element La and one or two optional elements selected from among Nd and Sm). The present invention also provides a microwave dielectric ceramic composition containing a primary component represented by the compositional formula: xCaTiO3-(1-x)LnAlO3 [0.54≦x≦0.82] (wherein Ln is at least one species selected from among Y, La, Nd, Sm, etc.); and Na in an amount as reduced to Na2O of 0.02 to 0.5 parts by mass on the basis of 100 parts by mass of the primary component. The present invention also provides a dielectric resonator produced from the aforementioned microwave dielectric ceramic composition.

摘要翻译： 本发明涉及一种具有优异介电特性的微波介电陶瓷组合物， 并且即使在大尺寸时也显示出高的曲线的介质谐振器。 本发明提供一种包含由CaTiO 3 - （1-x）REA 10 3 [0.54 <= x <= 0.82]表示的主要组分的微波介电陶瓷组合物（其中 RE仅由必需元素La组成或由必需元素La和选自Nd和Sm中的一种或两种任选元素组成）。 本发明还提供了一种微波介电陶瓷组合物，其含有由以下组成式表示的主要组分：xCaTiO 3 - （1-x）LnAlO 3 [0.54 <= x < = 0.82]（其中Ln是选自Y，La，Nd，Sm等中的至少一种）; 基于100质量份的主要成分，Na为0.01〜0.5质量份的Na的量为Na 2 O 2。 本发明还提供了由上述微波介电陶瓷组合物制造的介质谐振器。

公开(公告)号：US06720280B2

公开(公告)日：2004-04-13

申请号：US10170413

申请日：2002-06-14

申请人： Katsuya Yamagiwa ,  Jun Otsuka ,  Takashi Kasashima ,  Manabu Sato ,  Kazuhisa Itakura ,  Takashi Oba ,  Masahiko Matsumiya

发明人： Katsuya Yamagiwa ,  Jun Otsuka ,  Takashi Kasashima ,  Manabu Sato ,  Kazuhisa Itakura ,  Takashi Oba ,  Masahiko Matsumiya

IPC分类号： C04B35495

CPC分类号： C04B35/457 ,  C01G19/006 ,  C01G33/006 ,  C01P2002/36 ,  C01P2006/40 ,  C01P2006/80 ,  C04B35/495 ,  H01B3/12

摘要： A dielectric composition is based on a BaO—MgO—Nb2O5 system material (BMN system material) having a dielectric constant, &egr;, of about 30, a large Q-value (no-load quality coefficient) and a comparatively small absolute value of the temperature coefficient (&tgr;f) of its resonance frequency but containing no expensive Ta. The dielectric material has a composite perovskite crystal structure as the main crystal phase, wherein a predetermined amount of KNbO3 is added to a BMN system material. The high frequency characteristics can be further improved by partially replacing Nb with Sb and partially replacing the B site of the perovskite crystal structure with Sn.

摘要翻译： 电介质组合物基于介电常数ε为约30的BaO-MgO-Nb 2 O 5体系材料（BMN体系材料），大的Q值（空载质量系数）和较小的绝对值 其谐振频率的温度系数（tauf），但不含昂贵的Ta。 电介质材料具有复合钙钛矿晶体结构作为主晶相，其中将预定量的KNbO 3添加到BMN系材料中。 通过用Sb部分地代替Nb并用Sn部分代替钙钛矿晶体结构的B位，可以进一步提高高频特性。