JP2005206450A - 低熱伝導率の遮熱コーティング用セラミック組成物 - Google Patents
低熱伝導率の遮熱コーティング用セラミック組成物 Download PDFInfo
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Abstract
【解決手段】セラミック組成物は、91モル%以上のジルコニアと9モル%以下の安定剤成分とを含有し、安定剤成分は、酸化イットリウム、酸化カルシウム、酸化セリウム、酸化スカンジウム、酸化マグネシウム、酸化インジウム及びこれらの混合物からなる群から選択される第1金属酸化物を含有する。安定剤成分はさらに、酸化ランタン、酸化ガドリニウム、酸化ネオジム、酸化サマリウム、ジスプロシウム及びこれらの混合物からなる群から選択される三価金属原子の第2金属酸化物及び酸化イッテルビウム、酸化エルビウム及びこれらの混合物からなる群から選択される三価金属原子の第3金属酸化物を含有する。
【選択図】図3
Description
(1)約91モル%以上のジルコニアと、
(2)約9モル%以下の安定化量の安定剤成分とを含有し、安定剤成分は
(a)酸化イットリウム、酸化カルシウム、酸化セリウム、酸化スカンジウム、酸化マグネシウム、酸化インジウム及びこれらの混合物からなる群から選択される第1金属酸化物、
(b)酸化ランタン、酸化ガドリニウム、酸化ネオジム、酸化サマリウム、酸化ジスプロシウム及びこれらの混合物からなる群から選択される三価金属原子の第2金属酸化物及び
(c)酸化イッテルビウム、酸化エルビウム及びこれらの混合物からなる群から選択される三価金属原子の第3金属酸化物
を含有する。
(A)金属基体、
(B)所望に応じて設けられる、金属基体に隣接し、重なるボンドコート層及び
(C)ボンドコート層に隣接し、重なる(ボンドコート層がない場合には金属基体に重なる)、上記セラミック組成物から形成された遮熱コーティング
を含む。
(A)所望に応じて、金属基体上にボンドコート層を形成し、
(B)ボンドコート層上に(ボンドコート層がない場合には金属基体上に)上記セラミック組成物を堆積して遮熱コーティングを形成する
工程を含む。
ここで、αは熱拡散率、pは気孔率、Cpは比熱(J/gK単位)、Dtは理論密度である。上式(1)からわかるように、熱伝導率は熱拡散率と気孔率に依存する。熱拡散率は、被覆組成物及びミクロ構造(即ち、内部境界のより高い安定性、より低い熱拡散率)により影響され、得られる遮熱コーティングの熱伝導率を改良する、特に下げる観点から、本発明のセラミック組成物の焦点である。
14 金属基体
18 ボンドコート層
22 遮熱コーティング
Claims (12)
- (1)91モル%以上のジルコニアと、
(2)9モル%以下の安定化量の安定剤成分とを含有し、安定剤成分は
(a)酸化イットリウム、酸化カルシウム、酸化セリウム、酸化スカンジウム、酸化マグネシウム、酸化インジウム及びこれらの混合物からなる群から選択される第1金属酸化物、
(b)酸化ランタン、酸化ガドリニウム、酸化ネオジム、酸化サマリウム、酸化ジスプロシウム及びこれらの混合物からなる群から選択される三価金属原子の第2金属酸化物及び
(c)酸化イッテルビウム、酸化エルビウム及びこれらの混合物からなる群から選択される三価金属原子の第3金属酸化物
を含有する、セラミック組成物。 - 92〜95モル%のジルコニアと5〜8モル%の安定剤成分とを含有する、請求項1記載の組成物。
- 第1金属酸化物が酸化イットリウムで3〜5モル%の量存在し、第2金属酸化物が酸化ランタン、酸化ガドリニウム及びこれらの混合物からなる群から選択され、0.25〜2モル%の量存在し、第3金属酸化物が0.5〜2.0モル%の量存在する、請求項1又は請求項2記載の組成物。
- 第2金属酸化物と第3金属酸化物を第2金属酸化物対第3金属酸化物の量比0.75〜1.33で含有する、請求項1乃至請求項3のいずれか1項記載の組成物。
- 第2金属酸化物が酸化ランタンで、第3金属酸化物が酸化イッテルビウムである、請求項1乃至請求項4のいずれか1項記載の組成物。
- (A)金属基体(14)、
(B)金属基体(14)に隣接し、重なるボンドコート層(18)及び
(C)ボンドコート層(18)に隣接し、重なる、請求項1乃至請求項5のいずれか1項記載の組成物を含有する遮熱コーティング(22)
を含む熱保護物品(10)。 - 物品がタービンエンジン部品であり、遮熱コーティング(22)が厚さ1〜100ミルで、耐歪み性柱状構造を有する、請求項6記載の物品(10)。
- 金属基体(14)に隣接し、重なるボンドコート層(18)上に遮熱コーティング(22)を製造する方法であって、
(A)セラミック組成物を堆積することによりボンドコート層(18)上に遮熱コーティング(22)を形成する工程を含み、
前記セラミック組成物は(1)ジルコニア91モル%以上と、
(2)(a)酸化イットリウム、酸化カルシウム、酸化セリウム、酸化スカンジウム、酸化マグネシウム、酸化インジウム及びこれらの混合物からなる群から選択される第1金属酸化物、
(b)酸化ランタン、酸化ガドリニウム、酸化ネオジム、酸化サマリウム、酸化ジスプロシウム及びこれらの混合物からなる群から選択される三価金属原子の第2金属酸化物及び
(c)酸化イッテルビウム、酸化エルビウム及びこれらの混合物からなる群から選択される三価金属原子の第3金属酸化物
を含有する安定剤成分9モル%以下の安定化量とを含有する、
遮熱コーティングの製造方法。 - セラミック組成物を物理蒸着により堆積して、耐歪み性柱状構造を有する遮熱コーティング(22)を形成する、請求項8記載の方法。
- 堆積するセラミック組成物が92〜95モル%のジルコニアと5〜8モル%の安定剤成分とを含有する、請求項8又は請求項9記載の方法。
- 堆積するセラミック組成物が、第1金属酸化物として酸化イットリウムを3〜5モル%の量、酸化ランタン、酸化ガドリニウム及びこれらの混合物からなる群から選択される第2金属酸化物を0.25〜2モル%の量、第3金属酸化物を0.5〜2.0モル%の量含有する、請求項8乃至請求項10のいずれか1項記載の方法。
- 堆積するセラミック組成物が酸化ランタンを0.5〜1.5モル%の量、酸化イッテルビウムを0.5〜1.5モル%の量含有する、請求項8乃至請求項11のいずれか1項記載の方法。
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