JP7381761B2 - 周波数安定型低誘電性マイクロ波誘電体セラミック材料及びその調製方法 - Google Patents
周波数安定型低誘電性マイクロ波誘電体セラミック材料及びその調製方法 Download PDFInfo
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- JP7381761B2 JP7381761B2 JP2022536683A JP2022536683A JP7381761B2 JP 7381761 B2 JP7381761 B2 JP 7381761B2 JP 2022536683 A JP2022536683 A JP 2022536683A JP 2022536683 A JP2022536683 A JP 2022536683A JP 7381761 B2 JP7381761 B2 JP 7381761B2
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- 229910010293 ceramic material Inorganic materials 0.000 title claims description 91
- 238000002360 preparation method Methods 0.000 title description 2
- 239000000463 material Substances 0.000 claims description 81
- 239000008367 deionised water Substances 0.000 claims description 74
- 229910021641 deionized water Inorganic materials 0.000 claims description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 74
- 239000000843 powder Substances 0.000 claims description 67
- 239000000203 mixture Substances 0.000 claims description 48
- 238000005498 polishing Methods 0.000 claims description 29
- 239000000126 substance Substances 0.000 claims description 29
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 26
- 230000015572 biosynthetic process Effects 0.000 claims description 26
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 26
- 239000002994 raw material Substances 0.000 claims description 26
- 238000003786 synthesis reaction Methods 0.000 claims description 26
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 24
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 24
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 17
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 16
- 238000005245 sintering Methods 0.000 claims description 16
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 239000008187 granular material Substances 0.000 claims description 7
- 229910017493 Nd 2 O 3 Inorganic materials 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 4
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000012071 phase Substances 0.000 description 47
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 24
- 235000012239 silicon dioxide Nutrition 0.000 description 23
- 239000004570 mortar (masonry) Substances 0.000 description 22
- 239000010453 quartz Substances 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 17
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 14
- 239000000919 ceramic Substances 0.000 description 12
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 11
- 229910001928 zirconium oxide Inorganic materials 0.000 description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 10
- 239000011230 binding agent Substances 0.000 description 10
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 7
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 7
- 229910004283 SiO 4 Inorganic materials 0.000 description 6
- 229910010413 TiO 2 Inorganic materials 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 5
- 235000010216 calcium carbonate Nutrition 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229910002971 CaTiO3 Inorganic materials 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000018 strontium carbonate Inorganic materials 0.000 description 3
- LEDMRZGFZIAGGB-UHFFFAOYSA-L strontium carbonate Chemical compound [Sr+2].[O-]C([O-])=O LEDMRZGFZIAGGB-UHFFFAOYSA-L 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- 229910017625 MgSiO Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052839 forsterite Inorganic materials 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium oxide Inorganic materials [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 description 2
- 229910002367 SrTiO Inorganic materials 0.000 description 1
- 229910002370 SrTiO3 Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 229910052634 enstatite Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- FKTOIHSPIPYAPE-UHFFFAOYSA-N samarium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Sm+3].[Sm+3] FKTOIHSPIPYAPE-UHFFFAOYSA-N 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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Description
周波数安定型低誘電性マイクロ波誘電体セラミック材料は、質量百分率で70%~90%の主相セラミック材料A、10%~30%の副相セラミック材料B、及び0~1.0%の酸化物焼結助剤Cから構成され、主相セラミック材料A、副相セラミック材料B、及び酸化物焼結助剤Cの質量百分率の合計は100%であり、主相セラミック材料Aは、化学式MgxMeySiO2+x+yを満たし、MeはCo又はZnであり、副相セラミック材料Bの組成は、aRO-bRe2O3-cTiO2を満たし、Rは、Ca又はSrの少なくとも1つであり、Re2O3は、Sm2O3、Nd2O3、Y2O3、Al2O3及びLa2O3の少なくとも2つであり、酸化物焼結助剤Cは、MnO2、MnCO3、WO3及びCeO2の少なくとも1つである。
1)主相セラミック材料Aの合成:
化学式MgxMeySiO2+x+yの量論比に従って原材料MgO、SiO2、ZnO、CoOを秤量して混合し、脱イオン水を溶媒とし、16~24hボールミル混合した後に乾燥させ、乾燥後の混合材料を40メッシュスクリーンに通し、酸化アルミニウム坩堝に入れ、1150℃~1300℃で2~4h焼成して主相粉材Aを合成し、研磨し、40メッシュスクリーンに通して使用に備える。
化学式aRO-bRe2O3-cTiO2の組成に従って原材料CaCO3、SrCO3、Sm2O3、Nd2O3、Y2O3、Al2O3及びLa2O3を秤量して混合し、脱イオン水を溶媒とし、16~24hボールミル混合した後に乾燥させ、次に、40メッシュスクリーンに通し、酸化アルミニウム坩堝に入れ、1100℃~1300℃で2~4h焼成して合成副相粉材Bを合成し、研磨し、40メッシュスクリーンに通して使用に備える。
1、簡単なペロブスカイト構造のCaTiO3とSrTiO3を改善し、セラミックの各成分の割合を調整することによって、セラミック材料の全温度範囲内の周波数温度係数が最適化され、これにより、温度差が大きい環境でデバイスの周波数安定性が高いことが確保される。
〈実施例1〉
化学式Mg2.00Co0.10SiO4.10の量論比に従って、原材料MgO、SiO2及びCoOを秤量し、混合材料と脱イオン水の比率1:3で脱イオン水を加え、20h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1250℃で3h焼成して、主相予備焼成粉材Aを得た。
化学組成0.99CaO・0.11SrO-0.06La2O3・0.05Al2O3-1.00TiO2に従って、原材料CaCO3、SrCO3、La2O3、Al2O3及びTiO2を秤量して混合し、混合材料と脱イオン水の比率1:2で脱イオン水を加え、16h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1200℃で3h焼成して、副相予備焼成粉材Bを得た。
〈実施例2〉
化学式Mg2.02Zn0.05SiO4.07の量論比に従って、原材料MgO、SiO2及びZnOを秤量し、混合材料と脱イオン水の比率1:3で脱イオン水を加え、16h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1200℃で3h焼成して、主相予備焼成粉材Aを得た。
化学組成1.05CaO・0.12SrO-0.08Nd2O3・0.06Al2O3-1.05TiO2に従って、原材料CaCO3、SrCO3、Nd2O3、Al2O3及びTiO2を秤量して混合し、混合材料と脱イオン水の比率1:2で脱イオン水を加え、20h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1200℃で3h焼成して、副相予備焼成粉材Bを得た。
〈実施例3〉
化学式Mg1.95Co0.10SiO4.05の量論比に従って、原材料MgO、SiO2及びCoOを秤量し、混合材料と脱イオン水の比率1:3で脱イオン水を加え、20h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1150℃で4h焼成して、主相予備焼成粉材Aを得た。
化学組成1.25CaO・0.20SrO-0.15La2O3・0.12Al2O3-1.20TiO2に従って、原材料CaCO3、SrCO3、La2O3、Al2O3及びTiO2を秤量して混合し、混合材料と脱イオン水の比率1:2で脱イオン水を加え、16h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1250℃で2h焼成して、副相予備焼成粉材Bを得た。
〈実施例4〉
化学式Mg2.00Co0.05SiO4.05の量論比に従って、原材料MgO、SiO2及びCoOを秤量し、混合材料と脱イオン水の比率1:3で脱イオン水を加え、20h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1200℃で3h焼成して、主相予備焼成粉材Aを得た。
化学組成0.85CaO・0.45SrO-0.15Sm2O3・0.10Al2O3-1.10TiO2に従って、原材料CaCO3、SrCO3、Sm2O3、Al2O3及びTiO2を秤量して混合し、混合材料と脱イオン水の比率1:2で脱イオン水を加え、20h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1150℃で4h焼成して、副相予備焼成粉材Bを得た。
〈実施例5〉
化学式Mg1.90Zn0.20SiO4.10の量論比に従って、原材料MgO、SiO2及びZnOを秤量し、混合材料と脱イオン水の比率1:3で脱イオン水を加え、16h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1150℃で2h焼成して、主相予備焼成粉材Aを得た。
化学組成0.95CaO・0.15SrO-0.10Y2O3・0.08Al2O3-1.05TiO2に従って、原材料CaCO3、SrCO3、Nd2O3、Al2O3及びTiO2を秤量して混合し、混合材料と脱イオン水の比率1:2で脱イオン水を加え、24h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1100℃で3h焼成して、副相予備焼成粉材Bを得た。
〈実施例6〉
化学式Mg2.00Zn0.03SiO4.10の量論比に従って、原材料MgO、SiO2及びZnOを秤量し、混合材料と脱イオン水の比率1:3で脱イオン水を加え、16h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1200℃で3h焼成して、主相予備焼成粉材Aを得た。
化学組成1.10CaO・0.20SrO-0.18Nd2O3・0.12Al2O3-1.20TiO2に従って、原材料CaCO3、SrCO3、Nd2O3、Al2O3及びTiO2を秤量して混合し、混合材料と脱イオン水の比率1:2で脱イオン水を加え、20h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1250℃で2h焼成して、副相予備焼成粉材Bを得た。
〈実施例7〉
化学式Mg1.85Co0.25SiO4.10の量論比に従って、原材料MgO、SiO2及びCoOを秤量し、混合材料と脱イオン水の比率1:3で脱イオン水を加え、20h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1250℃で2h焼成して、主相予備焼成粉材Aを得た。
化学組成1.20CaO・0.25SrO3-0.20La2O3・0.10Al2O3-1.18TiO2に従って、原材料CaCO3、SrCO3、La2O3、Al2O3及びTiO2を秤量して混合し、混合材料と脱イオン水の比率1:2で脱イオン水を加え、16h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1300℃で4h焼成して、副相予備焼成粉材Bを得た。
〈実施例8〉
化学式Mg2.02Zn0.05SiO4.07の量論比に従って、原材料MgO、SiO2及びZnOを秤量し、混合材料と脱イオン水の比率1:3で脱イオン水を加え、16h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1200℃で3h焼成して、主相予備焼成粉材Aを得た。
化学組成1.15CaO・0.10SrO-0.10Sm2O3・0.15Al2O3-1.10TiO2に従って、原材料CaCO3、SrCO3、Sm2O3、Al2O3及びTiO2を秤量して混合し、混合材料と脱イオン水の比率1:2で脱イオン水を加え、20h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1200℃で3h焼成して、副相予備焼成粉材Bを得た。
〈実施例9〉
化学式Mg1.90Co0.10SiO4.00の量論比に従って、原材料MgO、SiO2及びCoOを秤量し、混合材料と脱イオン水の比率1:3で脱イオン水を加え、20h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1250℃で2h焼成して、主相予備焼成粉材Aを得た。
化学組成1.25CaO・0.25SrO-0.15Y2O3・0.15Al2O3-1.08TiO2に従って、原材料CaCO3、SrCO3、La2O3、Al2O3及びTiO2を秤量して混合し、混合材料と脱イオン水の比率1:2で脱イオン水を加え、20h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1300℃で3h焼成して、副相予備焼成粉材Bを得た。
〈比較例1〉
化学式Mg2.00SiO4.00の量論比に従って、原材料MgOとSiO2を秤量し、混合材料と脱イオン水の比率1:3で脱イオン水を加え、24h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1300℃で3h焼成して、主相予備焼成粉材Aを得た。
化学式CaTiO3の組成に従って、原材料CaCO3とTiO2を秤量して混合し、混合材料と脱イオン水の比率1:2で脱イオン水を加え、16h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1100℃で3h焼成して、副相予備焼成粉材Bを得た。
〈比較例2〉
化学式Mg2.05SiO4.00の量論比に従って、原材料MgOとSiO2を秤量し、混合材料と脱イオン水の比率1:3で脱イオン水を加え、24h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1300℃で3h焼成して、主相予備焼成粉材Aを得た。
化学組成CaTiO3に従って、原材料CaCO3とTiO2を秤量して混合し、混合材料と脱イオン水の比率1:2で脱イオン水を加え、16h混合し研磨した後、120℃のオーブン内で乾燥させ、石英乳鉢で研磨した後、40メッシュスクリーンに通し、次に、粉末を酸化アルミニウム坩堝に入れ、1300℃で4h焼成して、副相予備焼成粉材Bを得た。
誘電常数εrとQ×f値を測定し、周波数温度係数τf=(f80-f25)/(f25×55)を計算により確定した。f 80とf 25はそれぞれ80℃と25℃でのサンプルの中心周波数である。
Claims (4)
- 周波数安定型低誘電性マイクロ波誘電体セラミック材料であって、
質量百分率で70%~90%の主相セラミック材料A、10%~30%の副相セラミック材料B、及び0~1.0%の酸化物焼結助剤Cから構成され、
主相セラミック材料A、副相セラミック材料B、及び酸化物焼結助剤Cの質量百分率の合計は100%であり、
主相セラミック材料Aは、化学式MgxMeySiO2+x+y (式中、2.00≦x+y≦2.20、1.80≦x≦2.15、0<y≦0.40)を満たし
MeはCo又はZnであり、副相セラミック材料Bの組成は、aRO-bRe2O3-cTiO2(式中、1.0≦a≦2.0、0.05≦b≦0.50、1.0≦c≦1.5)を満たし
Rは、Ca又はSrの少なくとも1つであり、
Re 2 O 3 は、Al 2 O 3 とSm 2 O 3 、又はAl 2 O 3 とNd 2 O 3 、又はAl 2 O 3 とY 2 O 3 、又はAl 2 O 3 とLa 2 O 3 であり、
酸化物焼結助剤Cは、MnO2、MnCO3、WO3及びCeO2の少なくとも1つである、
ことを特徴とする周波数安定型低誘電性マイクロ波誘電体セラミック材料。 - 2.00≦x+y≦2.10、1.80≦x≦2.05、0.05≦y≦0.25である、
ことを特徴とする請求項1に記載の周波数安定型低誘電性マイクロ波誘電体セラミック材料。 - 1.0≦a≦1.5、0.05≦b≦0.30、1.0≦c≦1.2である、
ことを特徴とする請求項1に記載の周波数安定型低誘電性マイクロ波誘電体セラミック材料。 - 請求項1~3のいずれか一項に記載の周波数安定型低誘電性マイクロ波誘電体セラミック材料の調製方法であって、
次のステップを含み、
(1)主相セラミック材料Aの合成:
化学式MgxMeySiO2+x+yの量論比に従って原材料MgO、SiO2、ZnO、CoOを秤量して混合し、脱イオン水を溶媒とし、16~24hボールミル混合した後に乾燥させ、乾燥後の混合材料を40メッシュスクリーンに通し、酸化アルミニウム坩堝に入れ、1150℃~1300℃で2~4h焼成して主相粉材Aを合成し、研磨し、40メッシュスクリーンに通して使用に備え、
(2)副相セラミック材料Bの合成:
化学式aRO-bRe2O3-cTiO2の組成に従って原材料CaCO3、SrCO3、Sm2O3、Nd2O3、Y2O3、Al2O3及びLa2O3を秤量して混合し、脱イオン水を溶媒とし、16~24hボールミル混合した後に乾燥させ、次に、40メッシュスクリーンに通し、酸化アルミニウム坩堝に入れ、1100℃~1300℃で2~4h焼成して合成副相粉材Bを合成し、研磨し、40メッシュスクリーンに通して使用に備え、
(3)一定の割合で、調製した主相セラミック材料A、副相セラミック材料B、及び酸化物焼結助剤Cを混合し、ZrO2ボールを研磨媒体とし、混合材料と脱イオン水の重量比1:1.5~2で脱イオン水を加え、12~18h湿式混合した後に120℃で乾燥させ、重量含有量が1%~3%のポリビニルアルコール接着剤を加えて研磨して造粒し、40メッシュスクリーンに通した後に80~120MPaの圧力で直径20mm、厚さ10mmのグリーン体にプレスし、空気雰囲気において1300℃~1450℃で2~4h焼結して、前記周波数安定型低誘電性マイクロ波誘電体セラミック材料を得る、
ことを特徴とする方法。
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