JP6728859B2 - セラミック基板およびその製造方法 - Google Patents
セラミック基板およびその製造方法 Download PDFInfo
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- JP6728859B2 JP6728859B2 JP2016062246A JP2016062246A JP6728859B2 JP 6728859 B2 JP6728859 B2 JP 6728859B2 JP 2016062246 A JP2016062246 A JP 2016062246A JP 2016062246 A JP2016062246 A JP 2016062246A JP 6728859 B2 JP6728859 B2 JP 6728859B2
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- ceramic layer
- ceramic
- mass
- anorthite
- insulator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B18/00—Layered products essentially comprising ceramics, e.g. refractory products
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0306—Inorganic insulating substrates, e.g. ceramic, glass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
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Description
(1)比誘電率、fQ積
誘電特性の評価は、ネットワークアナライザ(HEWLETT PACKARD製、8720D)を用いて、誘電体共振器法により行った(JIS R1627に準拠)。所定形状(直径11mm、厚さ5.5mm)の試料の共振周波数fと無負荷Q値を測定してfQ積を求めると共に、試料の寸法とfの関係から比誘電率を算出するもので、寸法は共振周波数が15GHzになる様に設定した。
(1)の試料を用いて、−20〜60℃の温度範囲における共振周波数を測定し、20℃での共振周波数を基準にして算出した。
多機能型X線回折装置MRD(スペクトリス社製)を使用し、線源にCu−Kαを用いてX線回折測定(XRD)を行った。
試料の外径、厚さ、重量から算出した。
直径5mm、高さ10mmの焼結体上下面を面出し加工した後、TMA(Thermal Mechanical Analysis)を用いて600℃/時間で昇温して測定し、40〜400℃の熱膨張係数を算出した。
第1絶縁物および第2絶縁物を用いた各々厚さ110μmのグリーンシートを10層積層し、85℃、30MPaの圧力を印加した状態で30分間保持してCIP(静水圧等方プレス装置)してグリーンシート積層体とした。その後、焼きあがりで、長さ36mm、幅12mm、厚さ1mmになるようにグリーンシート積層体を裁断した。その後900℃、2時間で焼成を行い、C面取りを行った後、抗折強度測定(JIS R 1601準拠)を実施した。測定サンプル(n=20)中の上下5値を除く、n=10の平均値を示す。
焼成後試料の測定面に鏡面研磨を施し、JIS Z 2244に基づきビッカース硬度測定を実施した(試験力1.961N(HV0.2))。
直径5.5mm、高さ12mmの形状に成形した試料をTMAにより10℃/minで昇温した際の収縮曲線の変化点の切片より収縮開始、終了温度を計測した。
得られたセラミック基板を厚み方向に切断し断面を鏡面研磨加工し光学顕微鏡で倍率を100倍として観察した。また、画像イメージの空孔部を黒、非空孔部を白に二値化して、画像解析ソフト(ImageJ)により、黒部の面積割合を算出した。即ち、計測した空孔部の面積を視野の総面積で割ることにより、視野面積に占める空孔率(%)として算出した。
上記と同様に、走査型電子顕微鏡にて倍率を2000倍として、第1セラミック層と第2セラミック層との接合界面のデラミネーションやクラックを観察した。
<セラミック基板の作製>
焼成により第1セラミック層を構成する第1絶縁物を準備した。素原料として、Al2O3 45.5質量%、SiO2 32.5質量%、SrCO3 13.0質量%、TiO2 3.5質量%、Bi2O3 2.3質量%、Na2CO3 2.4質量%、CuO 0.3質量%、Mn3O4 0.5質量%の組成(総量100質量%)となるように合計50kgを秤量し混合した。得られた混合粉を焼成用セッターに入れて、焼成炉で大気中800℃の温度で2時間保持して仮焼して仮焼物を得た。得られた仮焼物を粉砕して第1絶縁物を得た。第1絶縁物をX線回折で分析して結晶層を確認した。そのX線回折パターンにはAl2O3、SiO2の存在を示すピークが認められ、ピーク強度からAl2O3が主相であることを確認した。また、SrAl2Si2O8は確認されなかった。
第2セラミック層を構成する第2絶縁物を準備した。素原料として、Al2O3 15.0質量%、SiO2 53.8質量%、SrCO3 21.2質量%、Bi2O3 3.4質量%、Na2CO3 4.6質量%、K2CO3 1質量%、CuO 0.4質量%、Mn3O4 0.6質量%の組成(総量100質量%)となるように合計50kgを秤量し混合した。得られた混合粉を焼成用セッターに入れて、焼成炉で大気中775℃の温度で2時間保持して仮焼して仮焼物を得た。そのX線回折パターンには第1絶縁物と同様にAl2O3、SiO2の存在を示すピークが認められ、ピーク強度からAl2O3が主相であることを確認した。また、SrAl2Si2O8は確認されなかった。得られた仮焼物を86質量%と、市販の石英SiO2 (純度:99.8%)を14質量%とし、それ等を、ボールミルにて湿式粉砕とともに混合し、乾燥して第2絶縁物を作製した。そのX線回折パターンからSiO2が主相であることを確認した。
2 第2セラミック層
3 配線パターン
Claims (6)
- Al 2 O 3 とSrアノーサイトを含み、Al 2 O 3 換算で40〜50質量%のAl、SiO 2 換算で30〜40質量%のSi、SrCO 3 換算で10〜20質量%のSrを含有する第1セラミック層と、
Srアノーサイトとコーディエライトとを含み、前記第1セラミック層よりも比誘電率が小さい第2セラミック層とを備え、
前記第1セラミック層の熱膨張係数と前記第2セラミック層の熱膨張係数との差の絶対値が1×10 −6 /℃以下であるセラミック基板。 - 前記第1セラミック層と前記第2セラミック層は、BがB2O3換算で0.5質量%以下である請求項1に記載のセラミック基板。
- 前記第1セラミック層の比誘電率が7以上であり、第2セラミック層の比誘電率が6.5以下である請求項1又は2に記載のセラミック基板。
- 前記第1セラミック層は、Al 2 O 3 を主相とし、前記第2セラミック層は、Srアノーサイトを主相とする請求項1〜3のいずれか1項に記載のセラミック基板。
- 請求項1に記載のセラミック基板の製造方法であって、
少なくともSrアノーサイトを生成するガラスと、Al 2 O 3 の混合粉を含む第1絶縁物の層と、
少なくともSrアノーサイトを生成するガラスと、コーディエライトとの混合粉を含む第2絶縁物の層とを重ねて積層体を得る工程と、
前記積層体を焼成してSrアノーサイトを生成する工程を含む、
セラミック基板の製造方法。 - 前記第1絶縁物は、Al,Si,及びSrの酸化物又は炭酸塩の混合物を仮焼した仮焼物であり、
前記第2絶縁物は、Al,Si,及びSrの酸化物又は炭酸塩の混合物を仮焼した仮焼物とコーディエライト粉とを混合した混合仮焼物である請求項5に記載のセラミック基板の製造方法。
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