JP5977759B2 - エンジン燃焼室構造、および流路の内壁構造 - Google Patents
エンジン燃焼室構造、および流路の内壁構造 Download PDFInfo
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Description
次に、断熱部材1の表面緻密層2について具体的に説明する。表面緻密層2は、多孔質な構造の断熱多孔質層3の表面に形成された緻密なセラミックスの層である。表面緻密層2は、開気孔率が5%以下であることが好ましく、0.01〜4%であることがより好ましく、0.01〜3%であることがさらに好ましい。このようにすることにより、燃料の燃焼時のガス(燃料)の対流による熱伝達を防止することができる。また緻密なため、燃料の吸収やスス、燃えカスが付着しにくい。
次に、断熱多孔質層3について説明する。断熱多孔質層3は、多孔質のセラミックスの層であり、表面緻密層2の開気孔率よりも気孔率(開気孔率+閉気孔率)が大きいことが好ましい。断熱多孔質層3の気孔率は、10〜99%であることが好ましく、20〜90%であることがより好ましい。このようにすることにより、表面緻密層2からエンジン構成部材21への熱伝導を抑制することができる。
表面緻密層2と断熱多孔質層3とが、直接接合している構成としてもよいが、図1に示すように、表面緻密層2と断熱多孔質層3との間に接合層4(第一接合層4a)を有するように構成してもよい。また、エンジン燃焼室20を構成するエンジン構成部材21の内壁と、断熱多孔質層3との間に、接合層4(第二接合層4b)を有するように構成してもよい。
次に、断熱部材1の配置について説明する。断熱部材1は、エンジン燃焼室20を構成するエンジン構成部材21の表面(内壁)に備えられる。具体的には、ピストン14の上面14s、吸気バルブ16のバルブヘッド16s、排気バルブ17のバルブヘッド17s、シリンダヘッド13の底面13s等が挙げられる。
次に、断熱部材1の製造方法について説明する。表面緻密層2は、断熱多孔質層3を形成した上に、スパッタ法、PVD法、EB−PVD法、CVD法、AD法、溶射、プラズマスプレー法、コールドスプレー法、めっき、湿式コーティング後の熱処理などで形成することができる。または、表面緻密層2として緻密な薄板を別途作製し、断熱多孔質層3とともに下地材に貼り付けてもよい。
表面緻密層2として、直径90mm×厚さ20μmのジルコニア緻密体を用意した。このジルコニア緻密体は、以下のように作製した。まず、イットリア3mol%を含む部分安定化ジルコニア粉末に、バインダーとしてのポリビニルブチラール樹脂(PVB)、可塑剤としてのDOP、溶剤としてのキシレンおよび1−ブタノールを加え、ボールミルにて30時間混合し、グリーンシート成形用スラリーを調製した。このスラリーに真空脱泡処理を施すことにより、粘度を4000cpsに調整した後、ドクターブレード装置によって焼成後の厚さが20μmとなるように薄肉板用グリーンシートを形成し、直径90mmの寸法に外形切断を行った。この成形体を1500℃、3時間にて焼成し、更に、この焼成物を2mm厚の多孔質のアルミナ平板で挟み込み、1500℃、5時間にて再焼成して反りを修正し、表面緻密層2となるジルコニア緻密体とした。
表面緻密層2として、直径90mm×厚さ20μmの酸化亜鉛緻密体を用意した。この酸化亜鉛緻密体は、以下のようにして作製した。まず、酸化亜鉛粉末に、バインダーとしてのポリビニルブチラール樹脂(PVB)、可塑剤としてのDOP、溶剤としてのキシレンおよび1−ブタノールを加え、ボールミルにて30時間混合し、グリーンシート成形用スラリーを調製した。このスラリーに真空脱泡処理を施すことにより、粘度を4000cpsに調整した後、ドクターブレード装置によって焼成後の厚さが20μmとなるように薄肉板用グリーンシートを形成し、直径90mmの寸法に外形切断を行った。この成形体を1400℃、3時間にて焼成し、更に、この焼成物を2mm厚の多孔質のアルミナ平板で挟み込み、1400℃、5時間にて再焼成して反りを修正し、表面緻密層2となる酸化亜鉛緻密体とした。
下地材(エンジン構成部材21に相当)として、アルミニウム合金板(直径90mm×厚さ1mm)を用意し、第二接合層4bとしてめっきによりニッケル膜を製膜した。断熱多孔質層3の前駆体として、アルミナゾル、アッシュバルーン(中空のアルミナシリカ質球状粒子)、セラミックファイバーを混合したペーストを調製した。この前駆体を第二接合層4bを製膜した下地材に塗布し、400℃で熱処理した。その上に、CVD法により酸化亜鉛の緻密膜(表面緻密層2)を形成した。
断熱多孔質層3の前駆体として、コロイダルシリカ、フライアッシュバルーン(中空のアルミナシリカ質球状粒子)、セラミックファイバーを混合したペーストを調製した。下地材(エンジン構成部材21に相当)として、アルミニウム合金板(直径90mm×厚さ1mm)を用意し、断熱多孔質層3の前駆体のペーストを下地材に塗布し、その上に表面緻密層2を載せずに、さらに150℃で熱処理することで、硬化させた。
多層構造の断熱部材1(表面緻密層2+断熱多孔質層3)を表面に有するアルミニウム合金板における断熱性能を次のようにして評価した。ガスバーナーの火をアルミニウム合金板の断熱部材1側に近づけて、アルミニウム合金板の反対側に伝わる熱流量を測定し、同様にして比較用アルミニウム合金板(断熱部材なし)の熱流量を測定し、これらを比較した。
Claims (15)
- エンジン構成部材のエンジン燃焼室を構成する内壁に、セラミックスにより形成された断熱多孔質層と、
前記断熱多孔質層の表面に、セラミックスにより形成された表面緻密層と、
を含む断熱部材を備え、
さらに、前記エンジン構成部材の前記内壁と、前記断熱多孔質層との間に、前記断熱多孔質層と前記エンジン構成部材との中間の熱膨張係数を有し、前記断熱多孔質層と前記エンジン構成部材よりも低いヤング率の第二接合層を有する、エンジン燃焼室構造。 - 前記表面緻密層は、開気孔率が5%以下であり、
前記断熱多孔質層は、前記表面緻密層の前記開気孔率よりも気孔率が大きい請求項1に記載のエンジン燃焼室構造。 - 前記表面緻密層の厚さが前記断熱多孔質層の厚さの1〜50%である請求項1または2に記載のエンジン燃焼室構造。
- 前記表面緻密層は、波長1.5μmにおける反射率が、0.5より大きい請求項1〜3のいずれか1項に記載のエンジン燃焼室構造。
- 前記表面緻密層は、波長2.5μmにおける輻射率が0.5より大きい請求項1〜4のいずれか1項に記載のエンジン燃焼室構造。
- 前記表面緻密層は、厚さが20μm以下である請求項1〜5のいずれか1項に記載のエンジン燃焼室構造。
- 前記断熱多孔質層は、熱伝導率が0.5W/(m・K)以下である請求項1〜6のいずれか1項に記載のエンジン燃焼室構造。
- 前記断熱多孔質層は、熱容量が1000kJ/(m3・K)以下である請求項1〜7のいずれか1項に記載のエンジン燃焼室構造。
- 前記断熱多孔質層は、厚さが20〜500μmである請求項1〜8のいずれか1項に記載のエンジン燃焼室構造。
- 前記断熱多孔質層と、前記表面緻密層との間に、第一接合層を有する請求項1〜9のいずれか1項に記載のエンジン燃焼室構造。
- 前記断熱部材は、ピストン、バルブヘッド、シリンダヘッドの少なくともいずれかのエンジン燃焼室を構成する表面に備えられた請求項1〜10のいずれか1項に記載のエンジン燃焼室構造。
- 自動車を構成する部材のうち、エンジンの吸気ガスまたは排気ガスが流通する流路の内壁に、セラミックスにより形成された断熱多孔質層と、
前記断熱多孔質層の表面に、セラミックスにより形成された表面緻密層と、
を含む断熱部材を備え、
さらに、前記エンジンの吸気ガスまたは排気ガスが流通する流路の前記内壁と、前記断熱多孔質層との間に、前記断熱多孔質層と前記流路との中間の熱膨張係数を有し、前記断熱多孔質層と前記流路よりも低いヤング率の第二接合層を有する、流路の内壁構造。 - 前記表面緻密層は、開気孔率が5%以下であり、
前記断熱多孔質層は、前記表面緻密層の前記開気孔率よりも気孔率が大きい請求項12に記載の流路の内壁構造。 - 前記表面緻密層の厚さが前記断熱多孔質層の厚さの1〜50%である請求項12または13に記載の流路の内壁構造。
- 前記断熱多孔質層と、前記表面緻密層との間に、第一接合層を有する請求項12〜14のいずれか1項に記載の流路の内壁構造。
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