JP5321066B2 - セラミック組成物およびセラミック基板 - Google Patents
セラミック組成物およびセラミック基板 Download PDFInfo
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Description
(1)Si成分をSiO2に換算して47.0〜67.0重量%、Ba成分をBaOに換算して21.0〜41.0重量%、およびAl成分をAl2O3に換算して10.0〜18.0重量%含むとともに、
(2)SiO2、BaOおよびAl2O3にそれぞれ換算しての前記Si成分、前記Ba成分および前記Al成分の合計100重量部に対して、第1添加物としてのCe成分をCeO2に換算して1.0〜5.0重量部、
(3)SiO2、BaO、Al2O3およびCeO2にそれぞれ換算しての前記Si成分、前記Ba成分、前記Al成分および前記第1添加物の合計100重量部に対して、第2添加物としてのMn成分をMnOに換算して2.5〜5.5重量部、
(4)SiO 2 、BaOおよびAl 2 O 3 にそれぞれ換算しての前記Si成分、前記Ba成分および前記Al成分の合計100重量部に対して、第3添加物としてのZr成分、Ti成分、Zn成分、Nb成分、Mg成分およびFe成分の少なくとも1種を、それぞれ、ZrO 2 、TiO 2 、ZnO、Nb 2 O 5 、MgOおよびFe 2 O 3 に換算して、0.1〜5.0重量部含み、かつ、
(5)Crを実質的に含まないことを特徴としている。
2 セラミック層
3 積層体
4,5 外部導体膜
6 内部導体膜
7 ビアホール導体
21 セラミック基板
22,23 表層セラミック部
24 内層セラミック部
(1)Si成分をSiO2に換算して47.0〜67.0重量%、Ba成分をBaOに換算して21.0〜41.0重量%、およびAl成分をAl2O3に換算して10.0〜18.0重量%含むとともに、
(2)SiO2、BaOおよびAl2O3にそれぞれ換算しての前記Si成分、前記Ba成分および前記Al成分の合計100重量部に対して、第1添加物としてのCe成分をCeO2に換算して1.0〜5.0重量部含み、
(3)SiO2、BaO、Al2O3およびCeO2にそれぞれ換算しての前記Si成分、前記Ba成分、前記Al成分および前記第1添加物の合計100重量部に対して、第2添加物としてのMn成分をMnOに換算して2.5〜5.5重量部含み、さらに、
(4)SiO 2 、BaOおよびAl 2 O 3 にそれぞれ換算しての前記Si成分、前記Ba成分および前記Al成分の合計100重量部に対して、第3添加物としてのZr成分、Ti成分、Zn成分、Nb成分、Mg成分およびFe成分の少なくとも1種を、それぞれ、ZrO 2 、TiO 2 、ZnO、Nb 2 O 5 、MgOおよびFe 2 O 3 に換算して、0.1〜5.0重量部含み、かつ、
(5)Crを実質的に含まないものが用いられる。
(1)前述した組成比率をもって、Si成分、Ba成分、Al成分およびCe成分を混合した混合物を仮焼し、それによって仮焼粉を作製する工程と、
(2)上記仮焼粉に、Mn成分を添加する工程と
を経て製造される。
(1)前述した組成比率をもって、Si成分、Ba成分、Al成分およびCe成分を混合した混合物を仮焼し、それによって仮焼粉を作製する工程と、
(2)上記仮焼粉に、MnCO3 を添加するとともに、有機バインダを添加し、それによってセラミックスラリーを作製する工程と、
(3)前記セラミックスラリーを成形し、それによってセラミックグリーン層を形成する工程と
を経て製造される。
まず、出発原料として、いずれも粒径2.0μm以下のSiO2、BaCO3、Al2O3、CeO2、MnCO3、ZrO2、TiO2、ZnOおよびNb2O5の各粉末を準備した。次に、これら出発原料粉末を、焼成後に表1に示す組成比率となるように秤量し、湿式混合粉砕した後、乾燥し、得られた混合物を800〜1000℃で1〜3時間仮焼して原料粉末を得た。上記BaCO3は、焼成後に、BaOになり、上記MnCO3は、焼成後に、MnOになるものである。
(1)SiO2が47.0〜67.0重量%、BaOが21.0〜41.0重量%、およびAl2O3が10.0〜18.0重量%であるとともに、
(2)SiO2、BaOおよびAl2O3の合計100重量部に対して、第1添加物としてのCeO2が1.0〜5.0重量部であり、さらに、
(3)SiO2、BaO、Al2O3およびCeO2の合計100重量部に対して、第2添加物としてのMnOが2.5〜5.5重量部であり、かつ、
(4)Crを含まない
という条件を満たす、試料2〜6、10、14〜17、21〜24、26〜49、51〜53、および55〜57は、230MPa以上の優れた曲げ強度を示し、かつQ×f値についても、1000以上の値を示している。
まず、出発原料として、いずれも粒径2.0μm以下のSiO2、BaCO3、Al2O3、CeO2、MnCO3、ZrO2、MgCO3、Fe2O3、CoOおよびV2O5の各粉末を準備した。次に、これら出発原料粉末を、焼成後に表3に示す組成比率となるように秤量し、湿式混合粉砕した後、乾燥し、得られた混合物を800〜1000℃で1〜3時間仮焼して原料粉末を得た。上記BaCO3は、焼成後に、BaOになり、上記MgCO3は、焼成後に、MgOになるものである。
(1)SiO2が47.0〜67.0重量%、BaOが21.0〜41.0重量%、およびAl2O3が10.0〜18.0重量%であるとともに、
(2)SiO2、BaOおよびAl2O3の合計100重量部に対して、第1添加物としてのCeO2が1.0〜5.0重量部であり、さらに、
(3)SiO2、BaO、Al2O3およびCeO2の合計100重量部に対して、第2添加物としてのMnOが2.5〜5.5重量部であり、かつ、
(4)Crを含まない
という条件を満たしている。これら試料101〜124は、280MPa以上の優れた曲げ強度を示し、かつQ×f値についても、1000以上の値を示している。
出発原料として、いずれも粒径2.0μm以下のSiO2、BaCO3、Al2O3、CeO2、ZrO2、TiO2、Nb2O5およびMnCO3の各粉末を準備した。次に、これら出発原料粉末を、SiO2が57重量%、BaCO3が31重量%、Al2O3が12重量%となり、かつ、これらSiO2、BaCO3およびAl2O3の合計100重量部に対して、CeO2が3重量部、ZrO2が0.5重量部、TiO2が0.5重量部、Nb2O5が0.5重量部およびMnCO3が6.5重量部となるように秤量した。
上記実験例3において得られた試料Aに係る仮焼粉100重量部に対して、MnCO3粉末を6.5重量部、有機バインダを14重量部、分散剤を2.6重量部、および可塑剤を6重量部加え、混合してセラミックスラリーを得た。次いで、このセラミックスラリーをドクターブレード法によってシート状に成形し、乾燥して、試料Aに係るセラミックグリーンシートを得た。このセラミックグリーンシートは、クリーム色を呈していた。
第1および第2の表層セラミック部22および23を、前述の実験例1における試料30に係る組成をもって形成し、内層セラミック部24を、実験例1における試料48に係る組成をもって形成して、表層セラミック部22および23と内層セラミック部24とを積層した状態で焼成工程を実施し、試料となるセラミック基板21を得た。
Claims (9)
- Si成分をSiO2に換算して47.0〜67.0重量%、
Ba成分をBaOに換算して21.0〜41.0重量%、および
Al成分をAl2O3に換算して10.0〜18.0重量%含むとともに、
SiO2、BaOおよびAl2O3にそれぞれ換算しての前記Si成分、前記Ba成分および前記Al成分の合計100重量部に対して、第1添加物としてのCe成分をCeO2に換算して1.0〜5.0重量部、ならびに
SiO2、BaO、Al2O3およびCeO2にそれぞれ換算しての前記Si成分、前記Ba成分、前記Al成分および前記第1添加物の合計100重量部に対して、第2添加物としてのMn成分をMnOに換算して2.5〜5.5重量部含み、
SiO 2 、BaOおよびAl 2 O 3 にそれぞれ換算しての前記Si成分、前記Ba成分および前記Al成分の合計100重量部に対して、第3添加物としてのZr成分、Ti成分、Zn成分、Nb成分、Mg成分およびFe成分の少なくとも1種を、それぞれ、ZrO 2 、TiO 2 、ZnO、Nb 2 O 5 、MgOおよびFe 2 O 3 に換算して、0.1〜5.0重量部含み、かつ、
Crを実質的に含まない、セラミック組成物。 - SiO2、BaOおよびAl2O3にそれぞれ換算しての前記Si成分、前記Ba成分および前記Al成分の合計100重量部に対して、第4添加物としてのCo成分および/またはV成分を、それぞれ、CoOおよびV2O5に換算して、0.1〜5.0重量部含む、請求項1に記載のセラミック組成物。
- 前記Al成分をAl2O3に換算して15.0〜17.0重量%含み、かつ、
SiO2、BaOおよびAl2O3にそれぞれ換算しての前記Si成分、前記Ba成分および前記Al成分の合計100重量部に対して、前記第3添加物を、ZrO2、TiO2、ZnOおよびNb2O5の各々に換算して、0.5〜2.0重量部含む、請求項1に記載のセラミック組成物。 - 前記Si成分をSiO2に換算して47.0〜57.0重量%含み、
前記Al成分をAl2O3に換算して10.0〜15.0重量%含み、
SiO2、BaOおよびAl2O3にそれぞれ換算しての前記Si成分、前記Ba成分および前記Al成分の合計100重量部に対して、前記第3添加物を、前記Zr成分の場合はZrO2に換算して2.0〜4.0重量部、前記Ti成分の場合はTiO2に換算して0.1〜2.0重量部、前記Zn成分および前記Nb成分の各場合はZnOおよびNb2O5の各々に換算して0.1〜5.0重量部含む、請求項1に記載のセラミック組成物。 - 前記Si成分、前記Ba成分、前記Al成分および前記Ce成分を仮焼してなる仮焼粉と、仮焼していない前記Mn成分とを混合してなる、請求項1に記載のセラミック組成物。
- 請求項1ないし5のいずれかに記載のセラミック組成物を焼結させてなるセラミック層を備える、セラミック基板。
- 複数の前記セラミック層を積層してなる積層体を備え、前記積層体の表面および/または内部に所定の導体パターンを有する、請求項6に記載のセラミック基板。
- 前記導体パターンは、金、銀または銅を主成分とする、請求項7に記載のセラミック基板。
- 所定の熱膨張係数α1を有する第1および第2の表層セラミック部と、前記熱膨張係数α1よりも大きい熱膨張係数α2を有しかつ前記第1および第2の表層セラミック部の間に位置される内層セラミック部とを備える積層構造を有する、セラミック基板であって、
前記第1および第2の表層セラミック部ならびに前記内層セラミック部のいずれもが請求項1ないし5のいずれかに記載のセラミック組成物を焼結させてなるものである、セラミック基板。
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