CN1581368A - 介电陶瓷组合物和采用其的陶瓷电子部件 - Google Patents
介电陶瓷组合物和采用其的陶瓷电子部件 Download PDFInfo
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- CN1581368A CN1581368A CN200410070353.5A CN200410070353A CN1581368A CN 1581368 A CN1581368 A CN 1581368A CN 200410070353 A CN200410070353 A CN 200410070353A CN 1581368 A CN1581368 A CN 1581368A
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- 239000000203 mixture Substances 0.000 title claims abstract description 66
- 239000000919 ceramic Substances 0.000 title claims abstract description 58
- 229910052709 silver Inorganic materials 0.000 claims abstract description 27
- 239000004332 silver Substances 0.000 claims abstract description 27
- 239000011521 glass Substances 0.000 claims abstract description 26
- 238000010586 diagram Methods 0.000 claims abstract description 8
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 5
- 239000004020 conductor Substances 0.000 claims description 28
- 238000003475 lamination Methods 0.000 claims description 28
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 20
- 239000000470 constituent Substances 0.000 claims description 18
- 229960004643 cupric oxide Drugs 0.000 claims description 9
- 239000000292 calcium oxide Substances 0.000 claims description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 4
- 229910000416 bismuth oxide Inorganic materials 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 claims description 3
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000484 niobium oxide Inorganic materials 0.000 claims description 3
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 abstract description 5
- 239000002075 main ingredient Substances 0.000 abstract 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 230000000153 supplemental effect Effects 0.000 abstract 2
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 abstract 1
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000010344 co-firing Methods 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 description 27
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 26
- 238000001228 spectrum Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 12
- 239000000843 powder Substances 0.000 description 8
- 229910010293 ceramic material Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000010949 copper Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005245 sintering Methods 0.000 description 5
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
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- 229910052802 copper Inorganic materials 0.000 description 4
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- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
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- 238000012423 maintenance Methods 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 239000005749 Copper compound Substances 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- -1 add organic bond Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 150000001880 copper compounds Chemical class 0.000 description 1
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- 230000007812 deficiency Effects 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
介电陶瓷含有主要组分和相对于主要组分为0.05~2重量%的次要组分。主要组分在xBiO3/2-yCaO-zNbO5/2表示的三元组成图中的特定四角形区域内。次要组分是至少含有SiO2、Li2O、MO(其中M是Ca、Sr、Ba中的至少一种或以上)的玻璃组合物。将以该介电陶瓷为介电体层、以银为主要组分的导体层同时烧结得到的陶瓷电子部件的Q值降低小,并且微波特性优良。
Description
技术领域
本发明特别涉及在微波、毫波等高频区域作为共振器、滤波器、天线、电容器、电感器和电路板等使用的高频装置中有用的介电陶瓷组合物,以及采用该组合物的陶瓷电子部件。
背景技术
随着近年来移动通讯设备的发展,将介电陶瓷和内部导体层压形成电路的层压型介电陶瓷电子部件已经得到广泛的应用。为了得到小型并且高性能的层压型的介电陶瓷电子部件,介电陶瓷的介电特性是重要的。即,要求微波区域的介电常收(εr)高。还要求介电损失(tanδ)低,即其倒数Q值高。进一步要求共振频率的温度系数(TCF)的绝对值小。而且,内部导体使用以高导电率的金、银、铜为主要组分的金属,将导体和介电陶瓷一体同时烧成。为此,介电陶瓷必须在这些金属通过烧成不熔融的温度,即850~1050℃的比较低的温度下进行致密地烧结。特别是,银的熔点为962℃,在金、银、铜中最低,并且是高导电率的,即使在大气中烧成也不发生氧化,因此,烧成控制管理容易,并且成本较低,因此,在工业上是有利的。
作为满足上述要求的介电陶瓷组合物的一个例子,有人提出一种BiO3/2-CaO-NbO5/2系材料。该材料系具有50以上的高介电常数、3~5GHz的高Q值、不足±50ppm/℃的小TCF。而且,由于在1050℃以下的低温下进行致密烧结,能够得到采用金、银、铜等高导电率的金属导体的层压型介电陶瓷电子部件,因此,是极为有效的介电材料。这类介电体材料,例如公开在日本专利27981051号公报中。
但是,在由以BiO3/2-CaO-NbO5/2系为主要组分的材料构成的介电陶瓷材料的内层部分上,层压以银为主要组分的导体层的介电陶瓷电子部件中,烧成时,介电陶瓷材料的一部分组分和导体层的银发生反应。由此,介电陶瓷材料的Q值降低,不能发挥介电陶瓷电子部件本来的微波特性。
发明内容
本发明的介电陶瓷组合物含有由氧化铋、氧化钙和氧化铌构成的主要组分。在将该主要组分表示成xBiO3/2-yCaO-zNbO5/2(x、y、z表示摩尔比,x+y+z=1.0)时的三元组成图中,x、y、z位于以下述A、B、C、D为顶点的四角形区域内。相对于该主要组分,作为次要组分,至少含有0.05~2重量%包括SiO2、Li2O、MO的玻璃组合物。在此,M表示Ca、Sr、Ba中至少一种或以上的金属离子。由此,可以抑制烧成时介电陶瓷组合物与银发生的反应。因此,即使与以银为主要组分的导体层同时烧成,Q值的劣化也不大,可以得到微波特性优良的介电陶瓷组合物。
A:(x、y、z)=(0.48,0.184,0.336)
B:(x、y、z)=(0.48,0.22,0.30)
C:(x、y、z)=(0.44,0.24,0.32)
D:(x、y、z)=(0.44,0.20,0.36)
附图的简单说明
图1是表示本发明实施方案中的BiO3/2-CaO-NbO5/2组合物的组成范围的图。
图2是本发明实施方案中的具有带状导体层的层压共振器的斜视图。
图3是图2表示的层压共振器的纵向截面图。
图4是图2表示的层压共振器的横向截面图。
图5A~图5C是图2表示的层压共振器的各内层导体的电极图案图。
图6是表示本发明实施方案中次要组分的玻璃组合物的组成范围的图。
发明的实施方案
图1是表示本发明实施方案中的介电陶瓷组合物的主要组分的xBiO3/2-yCaO-zNbO5/2组合物的组成范围的组成图。图2是本实施方案中陶瓷电子部件的层压共振器的斜视图,图3、图4是纵向截面图和横向截面图。图5A~图5C是各内层导体的电极图案图。
首先,对介电陶瓷组合物进行详细说明。表1表示本实施方案中陶瓷组合物的主要组分的BiO3/2-CaO-NbO5/2的摩尔比。x、y、z表示摩尔比,x+y+z=1.0,作为用于制造本实施方案的介电陶瓷组合物的起始原料,可以使用各构成要素的氧化物、碳酸盐、硝酸盐、有机金属盐等。并且希望其纯度在99%以上,但是没有特别的限制。表1中的样品1~3位于图1中表示的组成范围内,样品4~7在边界上。
准备容易获得的市售的氧化物原料,称量各起始原料,以形成表1的摩尔比,以水作为溶剂,通过球磨法混合24小时,由此制成浆料。将该浆料干燥后,通过放入到氧化铝制的坩埚中,在800℃下煅烧2个小时,由此制成煅烧粉末。将该煅烧粉末粉碎之后,加入规定量的下面描述的次要组分的玻璃组合物粉末,将它们通过与上述同样的方法混合粉碎并干燥。这样,就制成了所需的介电陶瓷组合物粉末。
表1
No. | xBiO3/2 | yCaO | zNbO5/2 |
1 | 0.46 | 0.215 | 0.325 |
2 | 0.45 | 0.215 | 0.335 |
3 | 0.47 | 0.2 | 0.33 |
4 | 0.48 | 0.184 | 0.336 |
5 | 0.48 | 0.22 | 0.3 |
6 | 0.44 | 0.24 | 0.32 |
7 | 0.44 | 0.2 | 0.36 |
8 | 0.49 | 0.2 | 0.31 |
9 | 0.43 | 0.22 | 0.35 |
10 | 0.46 | 0.235 | 0.305 |
11 | 0.46 | 0.185 | 0.355 |
(单位:摩尔比)
接着,对次要组分的玻璃组合物的制造方法进行说明。
表2
No. | uSiO2 | vLi2O | w | |||
CaO | BaO | SrO | MO合计 | |||
A | 60 | 10 | 10 | 20 | 0 | 30 |
B | 60 | 10 | 10 | 10 | 10 | 30 |
C | 60 | 10 | 0 | 20 | 10 | 30 |
D | 60 | 10 | 30 | 0 | 0 | 30 |
E | 70 | 5 | 10 | 15 | 0 | 25 |
F | 70 | 15 | 10 | 5 | 0 | 15 |
G | 50 | 5 | 20 | 20 | 5 | 45 |
H | 50 | 15 | 10 | 20 | 5 | 35 |
I | 60 | 5 | 10 | 20 | 5 | 35 |
J | 60 | 15 | 10 | 15 | 0 | 25 |
K | 45 | 10 | 20 | 20 | 5 | 45 |
L | 75 | 10 | 5 | 10 | 0 | 15 |
M | 60 | 3 | 12 | 20 | 5 | 37 |
N | 60 | 18 | 10 | 12 | 0 | 22 |
(单位:重量%)
表2是本发明实施方案中使用的次要组分的玻璃组合物的构成元素的重量比。在本发明中,玻璃组合物的组成是uSiO2-vLi2O-wMO。u、v、w是重量%(以下称为wt%),u+v+w=100,其中M表示Ca、Sr、Ba中的至少一种或以上的金属离子。首先,按照表2的构成元素重量比,采用市售的氧化物材料,称量各起始原料。接着,以乙醇作为溶剂,通过球磨法将各起始原料混合24小时,制备浆料。在将该浆料干燥之后,放入到白金坩埚中,在1200~1400℃下进行1个小时的热处理,使其熔融。通过将该熔融物滴到金属板上进行急冷,制作玻璃块。通过球磨法将得到的玻璃块粉碎成规定的粒度,得到次要组分的玻璃组合物粉末。下面对玻璃组合物的效果进行描述。
下面,说明对采用主要组分为xBiO3/2-yCaO-zNbO5/2组合物和次要组分为玻璃组合物的,本实施方案的介电陶瓷组合物的烧结体特性的评价方法。采用表1、表2表示的主要组分和次要组分,准备按照表3表示的组成配合的介电陶瓷组合物粉末。在该组合物粉末中加入10重量%作为粘合剂的聚乙烯醇5%的水溶液,进行混合之后,通过32目的筛,进行造粒。再在100MPa下压制成形为直径13mm、厚度约8mm的圆柱体和直径13mm、厚度约1mm的圆板体。将这些成形体在600℃下加热2个小时,烧掉粘合剂后,放入氧化镁容器中加盖,在大气中,在850~1000℃下保持2个小时进行烧成。
在表3中,表示测定在形成最大密度的温度下烧成的烧结体的各组成的特性。在这些制备的圆板体的正反面涂敷银糊状物,采用带式炉在850℃下烘烤10分钟,形成电极。然后,在施加电压500V、时间60秒、测定温度120℃的条件下,测定高温下的绝缘电阻值。
另外,采用制造的圆柱体,通过介电共振器法,求出微波下的共振频率f和无负载的Q值。进一步由烧结体的尺寸和共振频率计算出介电常数。此时的共振频率为3~5GHz。将无负荷的Q值乘以共振频率,计算Qf积,以此作为表示介电陶瓷组合物的损失的指标。该方法对普通技术人员而言是通常进行的方法。进而,测定在-25℃、20℃和85℃下的共振频率,通过最小二乘法,计算温度系数(TCF)。
在改变了组成比的BiO3/2-CaO-NbO5/2材料(下面称为BCN材料)中加入作为次要组分的以SiO2、Li2O、MO为主要组分的玻璃,对于该介电陶瓷材料的各特性的评价结果,在表3中表示。关于介电陶瓷材料的特性和陶瓷电子部件的特性结果的说明在下面详细描述。
表3
另外,图1是用图表示的BCN材料的本发明与现有技术的日本专利2798105号的范围的比较。网络划线表示的区域11(包括边界线)是本发明的范围,包括该范围的用斜线表示的五角形的区域12(斜线)是日本专利2798105号的范围。如图1所示,本发明的组成范围被限定在BiO3/2比小的范围内。
另外,样品编号101~106中,固定BCN材料和玻璃材料的组成比,改变玻璃的加入量。样品编号107~116中表示改变BCN材料的组成比,作为次要组分加入表2中的组分A时的结果。
接着,对于本实施方案的陶瓷电子部件,采用图2~图5C进行说明。由介电陶瓷组合物构成的介电体层1采用未烧结板制造。带状导体层(第1层)2采用金、银、铜等具有高导电率的金属材料。粘结导体层(第2层)3与在第1层2之间形成电容器,与信号端子电极(下面称为电极)6连接。屏蔽导体层(第3层)4由与第1层2相同的电极材料构成,并与地线端子电极(下面称为电极)5连接。电极5、6的材料可以采用与第1导体层2相同的电极材料,也可以采用其它电极材料。
接着,作为使用本实施方案的介电陶瓷组合物的陶瓷电子部件的一个例子,对以银作为导体层的层压共振器的制造方法和评价方法进行说明。首先,在介电陶瓷组合物粉末中加入有机粘合剂、溶剂和可塑剂,通过公知的刮刀法将采用球磨机进行混合制成的浆料制成厚度为80微米的未烧结板。另一方面,导体材料使用银(100%),通过在具有给定粒度的银粉中混合将乙醇与溶剂混合制成的有机调漆料,制成银糊状物。
采用上述未烧结板和银糊状物,在多个未烧结板1A上,如图5A~5C所示通过丝网印刷法,印刷形成第1层2、第2层3、第3层4。然后,采用这些印刷形成电极图案的多个未烧结板,形成层压体。通过将该层压体在40℃、500kg/cm2的条件下热压,来进行完全压接。用切断机将压制的层压体切断成各个元件后,在500℃下保持10个小时的条件下,使有机成分挥散。然后,在850~950℃下保持2个小时的条件下烧成。作为电极5、6,将市售的银糊状物如图2~图4所示进行涂敷,在800℃下保持10分钟的条件下进行烘烤,制成层压共振器。烧成后的层压共振器的第1层2的带状线长度约为4.0mm,宽度约为1.0mm,厚度约为2.0mm。
在如上制造的层压共振器的第2层3上介入电极5直列连接切片型电容器。然后,进行整合以使阻抗约为50Ω,通过网络分析器测定层压共振器的共振频率、Q值和温度系数TCF。
在作为现有例的日本专利2798105号公报中给出的实施例中,以可与银导体同时烧成的下述组成作为样品编号100来进行制备。本实施方案与现有例的评价结果示于表3中。
BCN材料:原子比为x=0.49,y=0.20,z=0.31
加入[Cu/(Bi+vCa+Nb)]=0.01的氧化铜
由表3可知,现有例的样品编号100显示了介电陶瓷的材料特性为Qf积2300GHz的优良特性,但是,将银导体作为第1层2的层压共振器的Q值低至150。与此相对,在规定的组成范围的介电陶瓷中,材料特性不仅没有很大差别,而且,层压共振器的Q值都获得了200以上的高值。
因此,玻璃的加入量优选为0.05~2重量%。如果加入量少,由于无法在950℃下烧成,因此,无法与银导体同时烧成,而如果加入量多,Q值急剧降低。
而且,样品编号114和116中的BCN材料的组成比由于烧结温度高于950℃,因此,无法与银导体同时烧成,是不优选的。而且,样品编号115的组成比中,介电陶瓷材料的固有Qf积降低,由此引起的层压共振器的Q值也降低,因此也是不优选的。样品编号113的组成比与样品编号100的同样,虽然介电陶瓷材料的特性优良,但是层压共振器的Q值特性低,因此是不优选的。
样品编号100、113是比图1所示的范围BiO3/2比大的组成的BCN材料。其中,可认为过剩的BiO3/2在烧成中与层压共振器的导体材料的银反应,引起了层压共振器的Q值的大大降低。
由以上结果可知,通过将由图1所示的范围的介电陶瓷组合物构成的介电体层,与以银为电极的导体层层压,进行同时烧成,可以获得特别是高频区域中小型并且安装性优良的层压共振器。即,可以获得微波特性极为优良的陶瓷电子部件。
下面对作为次要组分的玻璃组合物的组成进行描述。表4表示BCN材料的组成比一定,加入表2表示的SiO2、Li2O、MO的组成比不同的玻璃0.5重量%的组成。还表示通过上述方法评价的介电陶瓷组合物的材料特性和作为陶瓷电子部件的一个例子的层压共振器的电特性。图6是用斜线区域13(包括边界线)表示次要组分的玻璃组合物的本实施方案中的组成范围的图。在表2中,A~D包括区域13,E~H相当于区域13的各顶点。
表4
由表4可知,图6中的区域13(包括边界线)的组成范围内,介电陶瓷组合物的材料特性和层压共振器的电特性没有很大差别。而且,层压共振器的Q值在所有情况下都获得了220以上的高值。
另一方面,在比图6的区域13SiO2的比例小的样品编号126、Li2O的比例大的样品编号129中,材料特性有些降低,由此引起层压共振器的Q值也有些降低。而且,在样品编号127、128的组成比下,烧成温度高至950℃。因此,在与银导体同时烧成时,由于烧成炉的温度不均,一部分银导体可能发生熔融,存在实用上的问题。
根据以上结果,为了获得实用上稳定并且具有高Q值的层压共振器,应该使次要组分玻璃组合物的组成比在图6的区域13(包括边界线)表示的范围内。
只要不对特性产生不利影响,在玻璃组合物中还可以加入Al2O3、B2O3、Na2O、SnO2、P2O5等。在表4中,表示固定主要组分和玻璃组分的添加量的试验结果,但是只要是在图1表示的组成范围的主要组分,也具有同样的效果。而且,玻璃成分的加入量如前所示在0.05~2重量%的范围内时可获得同样的效果。
接着,对在介电陶瓷组合物中加入作为第2次要组分的氧化铜(CuO)的效果进行描述。制造相对于表3的样品编号103的材料组成100重量%,在0.05~0.15重量%的范围内改变加入的CuO的介电陶瓷组合物。该介电陶瓷组合物的特性和层压共振器的特性结果在表5表示。
表5
由表5可知,通过加入少量的CuO,可以将烧结温度降低25℃或以上,由于与银的熔融温度962℃的温度差扩大了,因此,在大量生产时能够稳定烧成。但是,如果如样品编号132那样过量加入CuO,尽管介电陶瓷组合物的Qf值没有降低太多,但是,层压共振器的Q值却大大降低。过剩加入的CuO引起与银导体发生反应被认为是一个原因。因此,加入量优选为0.05~0.1重量%或以下。
只要在对特性没有不利影响的范围内,可以含有其它杂质成分。而且,可以代替CuO加入其它铜化合物。这时,加入量优选换算成CuO为0.1重量%或以下。而且,在表5中表示了固定主要组分和玻璃成分进行试验的结果,在图1和图6的组成范围内,也具有同样的效果。
在本实施方案中,虽然采用银作为导体层,但是在含有95重量%以上的银时,具有上述效果。
如上所述的本发明的介电陶瓷组合物抑制了与银的反应,即使与以银为主要组分的导体层同时烧结,也能够获得Q值极高的介电陶瓷组合物。该介电陶瓷组合物可用作微波、毫波等高频波区域使用的小型、高性能的共振器、滤波器、天线、电容器、电感器和电路板等陶瓷电子部件等。
Claims (4)
1、一种介电陶瓷组合物,含有由氧化铋、氧化钙和氧化铌构成的主要组分xBiO3/2-yCaO-zNbO5/2(x、y、z表示摩尔比,x+y+z=1.0),和至少含有0.05~2重量%的uSiO2-vLi2O-wMO(u、v、w表示重量比,M为Ca、Sr、Ba中的至少一种或以上)的次要组分的玻璃组合物;在上述主要组分的三元组成图中,x、y、z位于以下述A、B、C、D为顶点的四角形区域内:
A:(x、y、z)=(0.48,0.184,0.336)
B:(x、y、z)=(0.48,0.22,0.30)
C:(x、y、z)=(0.44,0.24,0.32)
D:(x、y、z)=(0.44,0.20,0.36)。
2、权利要求1记载的介电陶瓷组合物,在上述次要组分的三元组成图中,u、v、w位于以下述E、F、G、H为顶点的四角形区域内:
E:(u、v、w)=(50、5、45)
F:(u、v、w)=(70、5、25)
G:(u、v、w)=(70、15、15)
H:(u、v、w)=(50、15、35)
3、权利要求1记载的介电陶瓷组合物,相对于上述主要组分100重量%,含有作为第2次要组分的氧化铜,其含量换算成CuO为0.05~0.1重量%。
4、一种陶瓷电子部件,具备由介电陶瓷组合物构成的介电层和含有95重量%或以上的银、并与介电体层层压的导体层,所述的介电陶瓷组合物含有由氧化铋、氧化钙和氧化铌构成的主要组分xBiO3/2-yCaO-zNbO5/2(x、y、z表示摩尔比,x+y+z=1.0),和至少含有0.05~2重量%的uSiO2-vLi2O-wMO(u、v、w表示重量比,M为Ca、Sr、Ba中的至少一种或以上)的次要组分的玻璃组合物,并且在上述主要组分的三元组成图中,x、y、z位于以下述A、B、C、D为顶点的方形区域内,
A:(x、y、z)=(0.48,0.184,0.336)
B:(x、y、z)=(0.48,0.22,0.30)
C:(x、y、z)=(0.44,0.24,0.32)
D:(x、y、z)=(0.44,0.20,0.36)。
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JP2798105B2 (ja) * | 1992-02-14 | 1998-09-17 | 松下電器産業株式会社 | 誘電体磁器組成物及び積層型マイクロ波デバイス |
US5273943A (en) * | 1992-02-28 | 1993-12-28 | Matsushita Electric Industrial Co., Ltd. | Dielectric ceramic compositions and microwave devices using the same |
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JP3087657B2 (ja) * | 1996-07-26 | 2000-09-11 | 株式会社村田製作所 | 誘電体磁器組成物 |
JP2000306762A (ja) * | 1999-04-22 | 2000-11-02 | Matsushita Electric Ind Co Ltd | 積層セラミックコンデンサ |
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JP2003119076A (ja) * | 2001-10-10 | 2003-04-23 | Matsushita Electric Ind Co Ltd | 誘電体セラミック組成物およびこれを用いたセラミック電子部品 |
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EP1505043A2 (en) | 2005-02-09 |
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