JP7112639B2 - 遠赤外線放射基材、遠赤外線放射基材の調製方法、高温炉用省エネルギー型遠赤外線放射塗料及び高温炉用省エネルギー型遠赤外線放射コーティング層 - Google Patents
遠赤外線放射基材、遠赤外線放射基材の調製方法、高温炉用省エネルギー型遠赤外線放射塗料及び高温炉用省エネルギー型遠赤外線放射コーティング層 Download PDFInfo
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Description
アミノ酸及び有機酸を水に溶解し、触媒を加えてB液に調製し、
A液とB液を攪拌混合した後、マイクロ波照射した後、乾燥し、研磨して前駆体を得て、
前駆体を焼成し、冷却後に研磨してLaAl1-xRuxO3ナノ粒子を得る。
前記高温炉用省エネルギー型遠赤外線放射塗料は、前記基材、調整剤、接着剤を含む。本発明の高温炉用省エネルギー型遠赤外線放射塗料は、高い放射率と低い熱伝導率を有し、調製されるコーティング層は、良好な遠赤外線放射性能と断熱性能、優れた結合強度と熱衝撃抵抗性を有する。
シリカ微粉末を用いたのは、シリカ微粉末は、極めて小さい熱膨張係数(0.5×10‐6/K)を有するとうえ、高い赤外線放射率を有し、ムライトやコージェライト等を膨張係数調整剤として使用することによる塗料の赤外線放射率の低下を効果的に回避し、またコーティング層が乾燥した際にシリカが速やかにネットワーク構造を形成し、塗料の施工性を向上させることができるからである。
この接着剤は、強い接着力、速い表面乾燥速度を有し、かつ耐高温であり、揮発性不純物が取り込まれにくく、炉内の製品を汚染することがない。特に、GeO2微粉末及び/又はIn2O3微粉末の存在により、LaAl1‐xRuxO3ナノ粒子の遠赤外線放射性能を増強することができるうえ、コーティング層の断熱性能、結合強度及び熱衝撃抵抗性に悪影響を及ぼさない。
従って、コーティング層は断熱保温作用を果たすことができ、熱損失を低減し、省エネルギー効果を奏することができる。
溶射によって前記高温炉用省エネルギー型遠赤外線放射塗料を炉内の炉壁表面に噴射し、省エネルギー型遠赤外線放射コーティング層を形成する。炉内の炉壁表面は、省エネ型の高温遠赤外線絶縁塗料を使用し、焼結後に0.3‐0.5mmの黒色セラミックコーティング層を形成し、当該セラミックコーティング層の熱伝導率が低く、炉壁と炉頂に対して断熱保温作用を果たし、炉の外壁温度を低下させ、放熱損失を低減し、燃料熱を有効利用して加熱炉の熱効率を向上させ、省エネルギーの目的を達成し、また、内炉壁の表面の放射率が20‐30%向上し、炉窯内炉壁の熱放射率は0.7‐0.8から0.9以上に上がり、昇温速度、降温速度及び加熱部の温度は大きく向上し、炉の生産効率を向上させ、かつ省エネルギーである。
式I
式II
mはキセロゲル質量であり、単位がgであり、
Claims (9)
- 遠赤外線放射基材であって、LaAl1-xRuxO3/トルマリンナノ粒子を含有し、
X値が、0超、0.95以下である、
ことを特徴とする遠赤外線放射基材。 - 前記遠赤外線放射基材の調製方法であって、ゾル‐ゲル法を採用し、以下の工程を含む:
硝酸ランタン、硝酸アルミニウム、硝酸ルテニウムを水溶液に調製した後に混合してA液に調製し、
アミノ酸及び有機酸を水に溶解し、触媒を加えてB液に調製し、
トルマリン粉体と脱イオン水を混合撹拌し、C液に調製し、
A液とB液とC液とを攪拌混合した後、マイクロ波照射、焼成、研磨を経て、前駆体を得て、
前記前駆体を焼成温度1000-1200℃で焼成し、冷却後に研磨してLaAl1-xRuxO3/トルマリンナノ粒子を得る、
ことを特徴とする請求項1に記載の前記遠赤外線放射基材の調製方法。 - 高温炉用省エネルギー型遠赤外線放射塗料であって、調整剤、接着剤及び請求項1に記載の遠赤外線放射基材を含む、
ことを特徴とする高温炉用省エネルギー型遠赤外線放射塗料。 - 前記調整剤がシリカ微粉末である、
ことを特徴とする請求項3に記載の高温炉用省エネルギー型遠赤外線放射塗料。 - 前記接着剤は、シリカゾルとGeO2微粉末及び/又はIn2O3微粉末との混合である、
ことを特徴とする請求項3に記載の高温炉用省エネルギー型遠赤外線放射塗料。 - 前記高温炉用省エネルギー型遠赤外線放射塗料の熱伝導率が<0.13W/(m・K)である、
ことを特徴とする請求項5に記載の高温炉用省エネルギー型遠赤外線放射塗料。 - 高温炉用省エネルギー型遠赤外線放射コーティング層であって、
溶射で炉内の炉壁表面に請求項3から6のいずれかに記載の前記高温炉用省エネルギー型遠赤外線放射塗料を噴射することによって形成される、
ことを特徴とする高温炉用省エネルギー型遠赤外線放射コーティング層。 - 結合強度が>31.8MPaである、
ことを特徴とする請求項7に記載の高温炉用省エネルギー型遠赤外線放射コーティング層。 - 少なくとも56回の1100℃の空気による熱衝撃抵抗性を有し、
前記熱衝撃抵抗性は、以下の方法により測定される、
ことを特徴とする請求項7に記載の高温炉用省エネルギー型遠赤外線放射コーティング層。
(熱衝撃抵抗性の測定方法)
冷熱サイクルとして、前記コーティング層をマッフル炉内に入れて1100℃まで加熱し、30分保温した後に冷水に10分浸漬し、水中から前記コーティング層を取り出す。前記コーティング層に脱落または亀裂が生じない場合、コーティング層にある水をふき取った後、前記冷熱サイクルを繰り返し、脱落または亀裂が生じるまでに繰り返した前記冷熱サイクルの回数を、熱衝撃抵抗性とする。
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