JP5481273B2 - 窒化珪素・メリライト複合焼結体を用いた基板および部材 - Google Patents
窒化珪素・メリライト複合焼結体を用いた基板および部材 Download PDFInfo
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Description
前記窒化珪素・メリライト複合焼結体の切断面における前記メリライト結晶相の占める割合が、20面積%以上であることを特徴とする基板。
前記窒化珪素・メリライト複合焼結体の切断面における前記メリライト結晶相の占める割合が、20面積%以上であることを特徴とする部材。
50≦[b/(a+b)]×100≦98
を満足していることが好ましい。この場合、焼結体は、2〜6ppm/Kの範囲の任意の平均熱膨張係数(23〜150℃)を有することができる。
平均粒径0.7μmの窒化珪素(Si3N4)粉末、平均粒径1.2μmのイットリア(Y2O3)粉末、SrCO3粉末、La2O3粉末、CeO2粉末およびAl2O3粉末を用い、得られた混合粉末とエタノールを、ボールミル容器中に投入し混合した後、加熱乾燥し、造粒した。なお、Srは酸化物(SrO)の形で投入すると製作工程中に水分で水酸化物(Sr(OH)2等)になりやすいので、炭酸塩(SrCO3等)等の形で投入する。なお、表の酸化物表記は、炭酸塩で加えたものを酸化物に換算したものである。
[理論密度比]
JIS R1634に準拠して、かさ密度を測定し、理論密度(例えばイットリア(Y2O3)粉末がすべてメリライト(Y2Si3O3N4(Me=Y))に変換され、残りの窒化珪素はそのままで、その他添加物は各酸化物の状態で存在したと仮定して計算)に対する比率を算出した(例えばY2Si3O3N4の密度は4.25(g/cm3))。なお、理論密度比が95%以上であれば、JIS R1634における見掛密度とかさ密度の差はほとんどなかった。
焼結体に吸水処理(水中にて脱泡)を行った後、乾燥させ、次式により算出した。
吸水率(%)=[(W1−W2)/W2)]×100
(W1:吸水処理後の焼結体重量、W2:乾燥後の焼結体重量)
この吸水率測定は、JIS-R2205に準拠して測定しても良い。
[メリライト主ピーク強度比率]
焼結体を粉砕し、X線回折装置((株)リガク製 RU−200T または(株)リガク製 X線回折装置 RINT−TTRIII)により、粉末X線回折を行い、メリライト(Me2Si3O3N4)の主ピークの回折強度bおよびSi3N4の主ピークの回折強度aを求め、次式より算出した。X線回折は試料を粉末にするなどの方法を用いて、測定試料の結晶配向性を十分小さい状態にして(または結晶の配向性を小さくする測定方法にて)測定する。
メリライト主ピーク強度比率(%)=[b/(a+b)]×100
[X線回折条件]
RINT−TTRIIIでの測定条件は
モノクロメータ使用にて、ターゲットを銅として、
管電流300mA、管電圧50kV、
スキャンスピード4°/分、サンプリング幅0.02°
とした。
JIS R1618に準拠して、熱機械分析装置((株)リガク製 熱機械分析装置 8310シリーズ)を用いて、熱機械分析による測定にて23〜150℃の平均熱膨張係数を求めた。なお、本明細書では平均線膨張率と平均熱膨張係数とを同義として扱う。同様に線膨張率は熱膨張係数と表現しても良いとする。
[曲げ強度]
JIS R 1601に準拠して室温(23℃)で3点曲げ強さを測定した。
[ヤング率]
JIS R 1602に規定する超音波パルス法により室温(23℃)で測定した。
3mm×4mm×10mmの形状に切断した焼結体の4mm×10mmの表面に鏡面加工を施した後、その表面をSEM(日本電子(株)製 JSM−6460LA)にて観察し、さらにEPMA(日本電子(株)製 JXA−8500F)を用いて二次電子像、反射電子像の観察、及びWDS(波長分散型X線分光器)ビームスキャンマッピングを行い、その表面における窒化珪素結晶相、メリライト結晶相、並びに、粒界相(ガラス相及び窒化珪素とメリライト以外の結晶相(表中、「その他」と記載))の面積比を求めた。また、これらの面積比は気孔を除いた部分を総面積(100(面積%))とみなして算出している。なお、必要に応じて(ガラス相や窒化珪素とメリライト以外の結晶相が多く、前記機器による観察だけでは面積比を求めることが困難である場合等)、STEM(走査型透過電子顕微鏡)((株)日立ハイテクノロジーズ製HD−2000)及びEDS(エネルギー分散型X線分析装置)(EDAX製Genesis)を用いた。また、場合により、鏡面加工面にエッチング処理を行い、このエッチング面をSEM等で観察して面積比を求めた。
13…メリライト結晶相
15…粒界相
20,30,40…プローブカード
100、200、400、500…回路基板
300…ヒーター基板
Claims (14)
- 窒化珪素結晶相と、メリライト結晶相(Me2Si3O3N4、Meは、メリライトを形成する金属元素であって、La,Ce,Prを除く周期表IIIa族元素)と、粒界相とを有する窒化珪素・メリライト複合焼結体を材料とした基板であって、
前記窒化珪素・メリライト複合焼結体の切断面における前記メリライト結晶相の占める割合が、20面積%以上であり、
前記切断面における前記メリライト結晶相の占める割合と、前記切断面における前記窒化珪素結晶相の占める割合との和が、80面積%以上であり、
SiをSi 3 N 4 換算で41〜83モル%、Meを酸化物換算で13〜50モル%、含有し、
平均熱膨張係数(23〜150℃)が2〜6ppm/Kであること、
を特徴とする基板。 - 前記窒化珪素・メリライト複合焼結体の吸水率が1.5%以下である請求項1に記載の基板。
- ヤング率が200GPa以上である請求項1または2に記載の基板。
- Siを、Si3N4換算で41〜79モル%、
Meを、酸化物換算で13〜46モル%、
添加物として、周期表IIa族元素を、酸化物換算で5〜20モル%、
含有する請求項1ないし3のいずれかに記載の基板。 - 添加物として、Mg、Ca、およびSrの少なくとも1種が添加される請求項4に記載の基板。
- Siを、Si3N4換算で45〜83モル%、
Meを、酸化物換算で15〜49モル%、
添加物として、La、Ce、およびPrの少なくとも1種を、酸化物換算で0.3〜12モル%、
含有する請求項1ないし3のいずれかに記載の基板。 - 添加物として、Al、Si、周期表IVa族元素、周期表Va族元素、および周期表VIa族元素からなる群より選択される少なくとも1種の元素がさらに添加される請求項4ないし6のいずれかに記載の基板。
- Alを、酸化物換算で0.5〜10モル%含有する請求項7に記載の基板。
- Meが、周期表IIIa族元素である請求項1ないし8のいずれかに記載の基板。
- 内部または表面に発熱体を備える請求項1ないし9のいずれかに記載の基板。
- 電子部品が配置される請求項1ないし9のいずれかに記載の基板。
- 電子部品が実装される回路基板に取り付けられるとともに、窒化珪素結晶相とメリライト結晶相(Me2Si3O3N4、Meはメリライトを形成する金属元素)と粒界相とを有する窒化珪素・メリライト複合焼結体を材料とした部材であって、
前記窒化珪素・メリライト複合焼結体の切断面における前記メリライト結晶相の占める割合が、20面積%以上であり、
前記切断面における前記メリライト結晶相の占める割合と、前記切断面における前記窒化珪素結晶相の占める割合との和が、80面積%以上であり、
SiをSi 3 N 4 換算で41〜83モル%、Meを酸化物換算で13〜50モル%、含有し、
平均熱膨張係数(23〜150℃)が2〜6ppm/Kであること、
を特徴とする部材。 - 回路基板に取り付けられるスティフナーである請求項12に記載の部材。
- 回路基板に取り付けられ、電子部品を内部に収納するためのキャップである請求項12に記載の部材。
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