JPH0260631B2 - - Google Patents
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- JPH0260631B2 JPH0260631B2 JP60214225A JP21422585A JPH0260631B2 JP H0260631 B2 JPH0260631 B2 JP H0260631B2 JP 60214225 A JP60214225 A JP 60214225A JP 21422585 A JP21422585 A JP 21422585A JP H0260631 B2 JPH0260631 B2 JP H0260631B2
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Description
〔産業上の利用分野〕
この発明は、誘電体共振器等の誘電体の材料と
して使用される誘電体磁器組成物に関する。
〔従来の技術〕
従来において、誘電体共振器（共振周波数f0が
400MHz〜10GHz）用の誘電体材料には、MgO・
CaO・TiO2を主成分とする磁器組成物やBaO・
TiO2を主成分する磁器組成物等が使用されてい
た。
誘電体共振器にこれらの誘電体磁器組成物が使
用される理由は、
(イ) 比誘電率の温度係数がほゞNPOで、これら
を誘電体とする誘電体共振器の共振周波数の温
度係数ηfが、０±30ppm／℃の範囲であるこ
と。
(ロ) Ｑが4000（εs≒40のとき）〜16000（εs≒20の
とき）と高いこと。
(ハ) 比誘電率εsの値が20〜40と、適当であるこ
と。
等による。
〔発明が解決しようとする問題点〕
上述した従来の誘電体磁器組成物の表面の粗さ
Rmaxは、３〜4μmと大きい。このため、誘電体
共振器を製造するに当たつては、円筒形に成形さ
れた磁器組成物について、ラツピング研磨及びセ
ンターレス研磨等の研磨を行い、端面及び外周面
の表面粗さRmaxを１〜2μmの範囲にしなければ
ならなかつた。
この発明は、従来の誘電体磁器組成物の問題点
を解消するためなされたもので、上記(イ)〜(ハ)の条
件を満足し、かつ１〜2μmの範囲の表面粗さ
Rmaxを持つた誘電体磁器組成物を提供すること
を目的とする。
〔問題を解決するための手段〕
以下この発明の構成を説明すると、この発明に
よる磁器組成物は、xZrO2・yCeO2・zSiO2・
TiO2なる組成式において、ｘ＋ｙ＋ｚ＝１で、
かつｘ、ｙ、ｚが三元図においてそれぞれ次に示
される多角形Ａ、Ｂ、Ｃ、Ｄで囲まれるモル比の
範囲にある成分と、Cr2O3を上記成分100重量部
に対して0.05〜1.0重量部含む成分とからなるも
のである。
ｘ ｙ ｚ
Ａ 0.98 0.01 0.01
Ｂ 0.60 0.39 0.01
Ｃ 0.60 0.18 0.22
Ｄ 0.77 0.01 0.22
さらに、xZrO2・yCeO2・zSiO2・TiO2なる組
成式において、ｘ＋ｙ＋ｚ＝１で、かつｘ、ｙ、
ｚが三元図において、上に示された多角形Ａ、
Ｂ、Ｃ、Ｄで囲まれるモル比の範囲にある成分
と、Cr2O3とAl2O3及びLa2O3の少なくとも何れ
か一方とを、上記成分100重量部に対して0.05〜
1.0重量部含む成分とからなる誘電体磁器組成物
である。
〔実施例〕
次にこの発明の実施例について説明する。
（実施例 １）
この実施例では、表１において、試料番号１〜
９，11〜14及び16〜19で示すように、組成の異な
る磁器から17種類の誘電体共振器を作つた。これ
を手順に従つて説明すると、まず、xZrO2・
yCeO2・zSiO2・TiO2なる組成式において、ｘ＋
ｙ＋ｚ＝１で、かつｘ、ｙ、ｚがそれぞれ表１の
各欄に示すような比になるよう、純度99％の
ZrO2，CeO2，SiO2及びTiO2をそれぞれ秤量し
た。さらに、この秤量物に対して、Cr2O3を表１
に示す割合に相当する重量だけ秤量して加え、こ
れらをアルコールと共にボールミルで20時間混合
した。
この混合物を乾燥し、1100℃の温度で２時間仮
焼きした後、粉砕した。次いで、バインダーとし
てポリビニルアルコールを加え、3ton／cm2の圧力
で、上記混合物を円板形に加圧成型した。続い
て、これらの成形体を、それぞれの組成比に応じ
た適当な温度（1300〜1380℃）で焼成し、直径８
mm、厚さ４mmの磁器組成物を各20個づつ得た。直
径24mmの真鍮に銅鍍金を施して鏡面仕上げをした
２枚の金属板で、これらの磁器組成物を挟み、誘
電体共振器を構成した。
次に、これらの誘電体共振器について、比誘電
率εs、無負荷のＱ、共振周波数の温度特性ηf及び
表面粗さRmaxをそれぞれ測定した。この結果を
表１に示す。
比誘電率εsは、誘電体共振法により、温度25℃
における共振周波数f0（何れも8.2GHz前後であつ
た）を測定し、この測定値と、上記磁器組成物の
直径と厚さの実測値をもとに求めた。無負荷のＱ
は、誘電体共振法により、温度25℃における電力
半値幅f2−f1及び挿入損IL0（dB）を測定し、この
測定値と上記共振周波数f0をもとに計算で求め
た。共振周波数の温度特性ηfは、25〜85℃の温度
範囲における共振周波数を測定し、１℃当たりに
換算して求めた。表面粗さRmaxについては、
JIS B0601に従い、磁器組成物の表面を深針式表
面粗さ計で測定した。なお、表面粗さRmaxにつ
いては20個の試料の最大値を、その他の特性につ
いては平均値を、表１に示した。
さらに、比較のため、表１の(10)，（15），（20）
蘭に示すように、この発明の範囲に含まれない組
成比を有する磁器組成物から、同形の誘電体共振
器を作り、これらについても、同様の試験を行つ
た。
なお、これら試料１〜９，11〜14，16〜19及び
(10)，（15），（20）の磁器組成物の組成比について、
図示の三元図において対応する符合Ａ〜Ｌを表１
に示した。
同表に示された結果から明らかな通り、試料１
〜９，11〜14及び16〜19では、比誘電体35.0〜
42.5、無負荷のＱが6300〜7500、共振周波数の温
度特性ηfが−22〜＋28ppm／℃、表面粗さRmax
が0.9〜1.7μmであつた。他方、試料(10)，（15），
（20）では、共振周波数の温度特性ηfがそれぞれ
−36，−39，−41ppm／℃と、−側で30ppm／℃よ
り大きくなつた。
[Industrial Application Field] The present invention relates to a dielectric ceramic composition used as a dielectric material for dielectric resonators and the like. [Conventional technology] Conventionally, a dielectric resonator (with a resonant frequency f 0
(400MHz to 10GHz) dielectric materials include MgO and
Porcelain compositions containing CaO/ TiO2 as main components and BaO/
Porcelain compositions mainly composed of TiO 2 were used. The reason why these dielectric ceramic compositions are used in dielectric resonators is that (a) the temperature coefficient of the relative permittivity is approximately NPO, and the temperature coefficient of the resonant frequency of the dielectric resonator using these as dielectrics is ηf must be in the range of 0±30ppm/℃. (b) Q is as high as 4000 (when εs≒40) to 16000 (when εs≒20). (c) The value of the relative dielectric constant εs should be 20 to 40, which is appropriate. According to etc. [Problems to be solved by the invention] Surface roughness of the above-mentioned conventional dielectric ceramic composition
Rmax is as large as 3 to 4 μm. Therefore, when manufacturing a dielectric resonator, the ceramic composition formed into a cylindrical shape is polished by wrapping polishing, centerless polishing, etc., and the surface roughness Rmax of the end face and outer circumferential face is reduced to 1. It had to be in the range of ~2 μm. This invention was made to solve the problems of conventional dielectric ceramic compositions, and it satisfies the above conditions (a) to (c) and has a surface roughness in the range of 1 to 2 μm.
The purpose of the present invention is to provide a dielectric ceramic composition having Rmax. [ Means for Solving the Problems] The structure of the present invention will be explained below . The porcelain composition according to the present invention has
In the composition formula TiO 2 , x+y+z=1,
and components whose x, y, and z are within the molar ratio range respectively surrounded by polygons A, B, C, and D shown below in the ternary diagram, and Cr 2 O 3 based on 100 parts by weight of the above components. It consists of a component containing 0.05 to 1.0 parts by weight. x y z A 0.98 0.01 0.01 B 0.60 0.39 0.01 C 0.60 0.18 0.22 D 0.77 0.01 0.22 Furthermore, in the composition formula xZrO 2・yCeO 2・zSiO 2・TiO 2 , x+y+z=1, and x, y,
In the ternary diagram, z is the polygon A shown above,
A component having a molar ratio within the range of B, C, and D and at least one of Cr 2 O 3 and Al 2 O 3 and La 2 O 3 are added in an amount of 0.05 to 0.05 to 100 parts by weight of the above components.
A dielectric ceramic composition comprising 1.0 parts by weight of components. [Example] Next, an example of the present invention will be described. (Example 1) In this example, in Table 1, sample numbers 1-
As shown in 9, 11-14, and 16-19, 17 types of dielectric resonators were made from ceramics with different compositions. To explain this step by step, first, xZrO 2 .
In the composition formula yCeO 2・zSiO 2・TiO 2 , x+
99% purity so that y + z = 1 and x, y, z are in the ratio shown in each column of Table 1.
ZrO 2 , CeO 2 , SiO 2 and TiO 2 were each weighed. Furthermore, for this weighed material, Cr 2 O 3 was determined in Table 1.
A weight corresponding to the proportion shown in was weighed and added, and these were mixed with alcohol in a ball mill for 20 hours. This mixture was dried, calcined at a temperature of 1100° C. for 2 hours, and then ground. Next, polyvinyl alcohol was added as a binder, and the mixture was pressure-molded into a disk shape at a pressure of 3 tons/cm 2 . Subsequently, these molded bodies were fired at an appropriate temperature (1300 to 1380°C) according to their respective composition ratios, and a diameter of 8.
20 porcelain compositions each having a thickness of 4 mm and a thickness of 4 mm were obtained. A dielectric resonator was constructed by sandwiching these porcelain compositions between two 24 mm diameter brass metal plates that were copper-plated to give a mirror finish. Next, for these dielectric resonators, the relative dielectric constant εs, Q without load, temperature characteristic ηf of resonance frequency, and surface roughness Rmax were measured. The results are shown in Table 1. The relative permittivity εs was calculated using the dielectric resonance method at a temperature of 25°C.
The resonant frequency f 0 (both were around 8.2 GHz) was measured, and the resonant frequency f 0 was determined based on this measured value and the actual measured values of the diameter and thickness of the above ceramic composition. Q without load
The power width at half maximum f 2 −f 1 and the insertion loss IL 0 (dB) at a temperature of 25° C. were measured by the dielectric resonance method, and calculated based on the measured values and the above-mentioned resonance frequency f 0 . The temperature characteristic ηf of the resonant frequency was determined by measuring the resonant frequency in a temperature range of 25 to 85°C and converting it to 1°C. Regarding surface roughness Rmax,
In accordance with JIS B0601, the surface of the porcelain composition was measured using a depth needle surface roughness meter. Table 1 shows the maximum value of the 20 samples for surface roughness Rmax, and the average value for other characteristics. Furthermore, for comparison, (10), (15), (20) in Table 1
As shown in Fig. 3, dielectric resonators of the same shape were made from a ceramic composition having a composition ratio outside the scope of the present invention, and similar tests were conducted on these as well. In addition, these samples 1-9, 11-14, 16-19 and
Regarding the composition ratio of the porcelain compositions (10), (15), and (20),
Table 1 shows the corresponding symbols A to L in the illustrated ternary diagram.
It was shown to. As is clear from the results shown in the same table, sample 1
~9, 11~14 and 16~19, dielectric constant 35.0~
42.5, no-load Q is 6300 to 7500, temperature characteristic ηf of resonance frequency is -22 to +28 ppm/℃, surface roughness Rmax
was 0.9 to 1.7 μm. On the other hand, samples (10), (15),
In (20), the temperature characteristics ηf of the resonant frequency were −36, −39, and −41 ppm/°C, respectively, which were larger than 30 ppm/°C on the negative side.
【表】【table】
【表】
（実施例 ２）
この実施例は、表２で示すように、ZrO2，
CeO2，SiO2及びTiOからなる成分100重量部に対
して、Cr2O3と共にAl2O3及びLa2O3のうち何れ
か一方を含む成分を、合計0.2または1.0重量部含
む磁器組成物から、実施例１と同形の誘電体共振
器を作り、同様の試験を行つた。
各試料の組成比及び試験結果を表２に示した。
また、上記各試料における主成分の組成比につい
ては、図示の三元図において対応する符号Ａ〜Ｈ
を同表に示した。
同表に示された結果から明らかな通り、上記各
試料では、比誘電率εsが34.8〜42.5、無負荷のＱ
が6200〜8300、共振周波数の温度特性ηfが−26〜
＋27ppm／℃、表面粗さRmaxが1.1〜1.9μmであ
つた。[Table] (Example 2) In this example, as shown in Table 2, ZrO 2 ,
Porcelain composition containing a total of 0.2 or 1.0 parts by weight of a component containing either Al 2 O 3 or La 2 O 3 together with Cr 2 O 3 for 100 parts by weight of components consisting of CeO 2 , SiO 2 and TiO A dielectric resonator having the same shape as in Example 1 was made from a material, and the same tests were conducted. Table 2 shows the composition ratio and test results of each sample.
In addition, regarding the composition ratio of the main components in each of the above samples, the corresponding symbols A to H in the illustrated ternary diagram
are shown in the same table. As is clear from the results shown in the same table, in each of the above samples, the relative dielectric constant εs is 34.8 to 42.5, and the Q
is 6200 to 8300, and the temperature characteristic ηf of the resonance frequency is −26 to
+27 ppm/°C, and the surface roughness Rmax was 1.1 to 1.9 μm.
【表】【table】
以上説明した通り、この発明によれば、磁器組
成物の表面粗さを１〜2μmの範囲にすることがで
きる。従つて、この磁器組成物を誘電体共振器の
誘電体として使用することにより、その研磨工程
を省くことができる。これにより、誘電体共振器
について、従来のものに比べて、10〜20％の原価
低減を見込むことができる。
なお、この発明による誘電体磁器組成物は、誘
電体共振器用の誘電体としてのみならず、高周波
回路基板や誘電体調整棒等の材料としても利用す
ることができる。
As explained above, according to the present invention, the surface roughness of the ceramic composition can be made within the range of 1 to 2 μm. Therefore, by using this ceramic composition as a dielectric of a dielectric resonator, the polishing step can be omitted. As a result, the cost of dielectric resonators can be expected to be reduced by 10 to 20% compared to conventional ones. The dielectric ceramic composition according to the present invention can be used not only as a dielectric for dielectric resonators, but also as a material for high-frequency circuit boards, dielectric adjustment rods, and the like.
図面は、この発明による磁器組成物の組成比の
範囲を示す三元図である。
Ａ〜Ｄ……組成範囲を示す多角形の頂点。
The drawing is a ternary diagram showing the range of composition ratios of the porcelain composition according to the present invention. A to D: vertices of a polygon indicating the composition range.
Claims (1)
おいて、ｘ＋ｙ＋ｚ＝１で、かつｘ、ｙ、ｚが三
元図において、次に示される多角形Ａ、Ｂ、Ｃ、
Ｄで囲まれるモル比の範囲にある成分と、Cr2O3
を上記成分100重量部に対して0.05〜1.0重量部含
む成分とからなる誘電体磁器組成物。 ｘ ｙ ｚ Ａ 0.98 0.01 0.01 Ｂ 0.60 0.39 0.01 Ｃ 0.60 0.18 0.22 Ｄ 0.77 0.01 0.22 ２ xZrO2・yCeO2・zSiO2・TiO2なる組成式に
おいて、ｘ＋ｙ＋ｚ＝１で、かつｘ、ｙ、ｚが三
元図において、次に示される多角形Ａ、Ｂ、Ｃ、
Ｄで囲まれるモル比の範囲にある成分と、Cr2O3
とAl2O3及びLa2O3の少なくとも何れか一方とを、
上記成分100重量部に対して0.05〜1.0重量部含む
成分とからなる誘電体磁器組成物。 ｘ ｙ ｚ Ａ 0.98 0.01 0.01 Ｂ 0.60 0.39 0.01 Ｃ 0.60 0.18 0.22 Ｄ 0.77 0.01 0.22[Claims] 1 In the compositional formula xZrO 2 ·yCeO 2 ·zSiO 2 ·TiO 2 , where x+y+z=1 and x, y, and z are the following polygons A, B, C,
Components in the molar ratio range surrounded by D and Cr 2 O 3
A dielectric ceramic composition comprising: 0.05 to 1.0 parts by weight per 100 parts by weight of the above components. x y z A 0.98 0.01 0.01 B 0.60 0.39 0.01 C 0.60 0.18 0.22 D 0.77 0.01 0.22 2 In the composition formula xZrO 2・yCeO 2・zSiO 2・TiO 2 , x+y+z=1, and x, y, z is ternary In the figure, the following polygons A, B, C,
Components in the molar ratio range surrounded by D and Cr 2 O 3
and at least one of Al 2 O 3 and La 2 O 3 ,
A dielectric ceramic composition comprising 0.05 to 1.0 parts by weight of components per 100 parts by weight of the above components. x y z A 0.98 0.01 0.01 B 0.60 0.39 0.01 C 0.60 0.18 0.22 D 0.77 0.01 0.22
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60214225A JPS6272562A (en) | 1985-09-27 | 1985-09-27 | Dielectric ceramic composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60214225A JPS6272562A (en) | 1985-09-27 | 1985-09-27 | Dielectric ceramic composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6272562A JPS6272562A (en) | 1987-04-03 |
| JPH0260631B2 true JPH0260631B2 (en) | 1990-12-17 |
Family
ID=16652270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60214225A Granted JPS6272562A (en) | 1985-09-27 | 1985-09-27 | Dielectric ceramic composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6272562A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63185646U (en) * | 1987-05-25 | 1988-11-29 | ||
| JPH04274107A (en) * | 1991-02-28 | 1992-09-30 | Taiyo Yuden Co Ltd | Manufacture of dielectric porcelain |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60153604A (en) * | 1984-01-23 | 1985-08-13 | Taiyo Yuden Co Ltd | Dielectric porcelain composition |
-
1985
- 1985-09-27 JP JP60214225A patent/JPS6272562A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6272562A (en) | 1987-04-03 |
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