JP2005314215A - 緻密質コーディエライト焼結体及びその製造方法 - Google Patents
緻密質コーディエライト焼結体及びその製造方法 Download PDFInfo
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Abstract
【解決手段】焼結体の結晶成分のうち、コーディエライトを93質量%以上含有し、焼結粒子の平均粒径が2μm以下である緻密質コーディエライト焼結体を提供する。平均粒径が2μm以下であるコーディエライト粉末を原料として用い、かつ1350〜1450℃で焼成する工程を含む緻密質コーディエライト焼結体の製造方法を提供する。
【選択図】なし
Description
[8]前記コーディエライト粉末にバインダーを添加し成形する成形工程を含み、該成形は、プレス成形、押出成形及びシート成形からなる群より選ばれるいずれか一つにより行われる[7]に記載の緻密質コーディエライト焼結体の製造方法。
る。コーディエライト粉末の平均粒径の下限に特に制限はないが、小さすぎると粉末化が困難になる場合や、粉砕時間が長時間に及ぶ場合がある。また、粉末のハンドリングが難しくなる場合もある。従って、平均粒径は、0.1μm以上であることが好ましく、0.3μm以上であることが更に好ましい。なお、この平均粒径は、レーザー回折法により測定することが出来る。
シート成形においては、例えば、コーディエライト粉末、バインダー、分散剤、可塑剤及び溶剤をポットで充分に混合した後粘度を調整し、所定の条件でシート成形する。必要に応じて、熱圧着もしくはCIP(冷間静水圧プレス)にて積層し、必要な厚さのシート成形体を得る。
なお、バインダーを用いた成形体の焼成においては、大気雰囲気で焼成、又は脱脂を行わずに不活性雰囲気や還元性雰囲気下で焼成を行う場合、脱脂の為に加湿雰囲気で焼成することが好ましい。
コーディエライト化原料を焼成することによって得られたコーディエライトを粉末化して、平均粒径が0.7μmのコーディエライト粉末を得た。
嵩密度(g/cm3):アルキメデス法により求めた。
結晶相:X線回折装置により同定。測定条件はCuKα、50kV、300mA、2θ=5−80°:回転対陰極型X線回折装置「理学電機製「RINT」」
結晶成分含有量(質量%):内部標準に酸化亜鉛を用い、各結晶成分のX線回折ピークの強度比から検量線を用いて含有量を求めた。
全気孔率(%):嵩密度と、焼結体の各結晶相の含有量から計算される理論密度から、以下の式で求めた。なお、理論密度を算出する際、サフィリンはスピネルと同じ密度として計算した。
全気孔率(%)=(1−嵩密度/理論密度)×100
開気孔率(%):アルキメデス法により求めた。
ワイブル係数はJIS R1625に準じて求め、下記式を用いて前記1/2サイズの強度に換算した。
熱膨張係数(/K):JIS R1618に準じて、押し棒示差式で測定した。
熱伝導率(W/mk):JIS R1611に準じて、レーザーフラッシュ法により測定した。
比誘電率:JIS C2141に準じた方法により測定した。試験片形状は50mm×50mm×1mmの角板状とし、主電極径14mm、ガード電極内径16mm、ガード電極外径22mm、印加電極径22mmとなるよう各電極を、金をスパッタ蒸着することにより形成した。
絶縁破壊強度(kV/mm):JIS C2141に準じた方法により測定した。試験片形状は45mm×45mm×1mmの角板状であり、昇圧は1kV/秒で行った。
体積抵抗率(Ω・cm):JIS C2141に準じた方法により、真空雰囲気下で室温から700℃まで測定した。試験片形状はφ35mm×1mmの円板状、または50mm×50mm×1mmの角板状とし、主電極径10mm、ガード電極内径20mm、ガード電極外径30mm、印加電極径30mmとなるよう各電極を銀で形成した。印加電圧は500V/mmとし、印加電圧後1分後の電流を読み取り、体積抵抗率を算出した。
実施例2〜14として、コーディエライト粉末の平均粒径を0.5〜1.8μmにし、焼成条件を表2に示す条件とした以外は、実施例1と同様にして、焼結体を得た。比較例1として、コーディエライト粉末の平均粒径を6.5μmにし、焼成条件を表2に示す条件とした以外は、実施例1と同様にして、焼結体を得た。また、比較例2として、コーディエライト粉末の平均粒径を0.5μmにし、焼成条件を表2に示す条件とした以外は、実施例1と同様にして、焼結体を得た。得られた焼結体の評価結果を表2に示す。また、実施例1で得られた焼結体の破面の電子顕微鏡による反射電子像を図1に、その研磨面をサーマルエッチングした後の2次電子像を図2に、実施例11で得られた焼結体の破面の反射電子像を図3に、比較例1で得られた焼結体の破面の反射電子像を図4に、比較例2で得られた焼結体の破面の反射電子像を図5に各々示した。なお、図2に示すような画像を基に焼結体の平均粒径を算出した。
実施例15〜17として、コーディエライト粉末の平均粒径を1.5μmにし、これにバインダー、分散剤、可塑剤及び溶剤を添加してポットで充分に混合した後粘度を調整し、シート成形して成形体を得た。次いで、表2に示す焼成条件にて焼成を行い、焼結体を得た。なお、実施例16〜17における水素と窒素の混合雰囲気で焼成を行う場合、脱脂の為に加湿雰囲気で焼成した。上記以外の条件は実施例1と同様にした。得られた焼結体の評価結果を表2に示す。
Claims (10)
- 焼結体に含まれる結晶成分のうち93質量%以上コーディエライトを含有し、焼結粒子の平均粒径が2μm以下である緻密質コーディエライト焼結体。
- 曲げ強度が200MPa以上である請求項1に記載の緻密質コーディエライト焼結体。
- 40〜600℃における熱膨張係数が2.0×10-6/K以下である請求項1又は2に記載の緻密質コーディエライト焼結体。
- ムライト、スピネル、サフィリンからなる群から選ばれる結晶相の1種以上を含有する請求項1〜3の何れかに記載の緻密質コーディエライト焼結体。
- ガラス質成分の含有量が5質量%以下である請求項1〜4の何れかに記載の緻密質コーディエライト焼結体。
- 気孔率が2%以下である請求項1〜5の何れかに記載の緻密質コーディエライト焼結体。
- 平均粒径が2μm以下であるコーディエライト粉末を原料として用い、かつ1350〜1450℃で焼成する工程を含む緻密質コーディエライト焼結体の製造方法。
- 前記コーディエライト粉末にバインダーを添加し成形する成形工程を含み、該成形は、プレス成形、押出成形及びシート成形からなる群より選ばれるいずれか一つにより行われる請求項7に記載の緻密質コーディエライト焼結体の製造方法。
- 前記コーディエライト粉末中のコーディエライトの含有量が93質量%以上である請求項7又は8に記載の緻密質コーディエライト焼結体の製造方法。
- 気孔率が2%以下であるコーディエライト焼結体を製造する請求項7〜9の何れかに記載の緻密質コーディエライト焼結体の製造方法。
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US11/087,541 US7229940B2 (en) | 2004-03-29 | 2005-03-23 | Dense cordierite based sintered body and method of manufacturing the same |
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KR20150131430A (ko) * | 2014-05-14 | 2015-11-25 | (주)세람초이스 | 결정화 실리케이트 합성 분말 및 이를 포함하는 고내열 도자 소지 |
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