JP6953348B2 - コーティング材、外周コート炭化珪素系ハニカム構造体、及び炭化珪素系ハニカム構造体の外周をコーティングする方法 - Google Patents
コーティング材、外周コート炭化珪素系ハニカム構造体、及び炭化珪素系ハニカム構造体の外周をコーティングする方法 Download PDFInfo
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- JP6953348B2 JP6953348B2 JP2018070013A JP2018070013A JP6953348B2 JP 6953348 B2 JP6953348 B2 JP 6953348B2 JP 2018070013 A JP2018070013 A JP 2018070013A JP 2018070013 A JP2018070013 A JP 2018070013A JP 6953348 B2 JP6953348 B2 JP 6953348B2
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- honeycomb structure
- silicon carbide
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- ceramic powder
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Description
(1)炭化珪素系ハニカム構造体用コーティング材であって、
化学成分として炭化珪素を55〜95質量%、二酸化珪素を5〜30質量%含むセラミック粉末(A)を20〜75質量%含むコーティング材。
(2)前記セラミック粉末(A)のレーザー回折・散乱法による粒度分布測定における体積基準D50が8〜30μmである(1)に記載のコーティング材。
(3)前記セラミック粉末(A)のレーザー回折・散乱法による粒度分布測定における体積基準D10が1〜4μmであり、D90が20〜75μm(ただし、D90>D50。)である(1)又は(2)に記載のコーティング材。
(4)前記セラミック粉末(A)は、前記炭化珪素系ハニカム構造体の研削屑又は粉砕粉である(1)〜(3)のいずれかに記載のコーティング材。
(5)さらに、白色又は淡色のセラミック粉末(B)を20〜50質量%含む(1)〜(4)のいずれかに記載のコーティング材。
(6)前記セラミック粉末(B)は、コージェライト、窒化珪素、アルミナ、ムライト、ジルコニア、燐酸ジルコニウム、チタニア及びアルミニウムチタネートからなる群より選択される少なくとも一種である(5)に記載のコーティング材。
(7)前記セラミック粉末(B)のレーザー回折・散乱法による粒度分布測定における体積基準D50が1〜40μm である(5)又は(6)に記載のコーティング材。
(8)前記コーティング材を600℃で30分乾燥した後の熱膨張係数と、前記炭化珪素ハニカム構造体の熱膨張係数との比が0.8〜1.1である(1)〜(7)のいずれかに記載のコーティング材。
(9)さらに、有機物を含む中空粒子を0.1〜4質量%含み、前記中空粒子のレーザー回折・散乱法による粒度分布測定における体積基準D50が35〜55μmである(1)〜(8)のいずれかに記載のコーティング材。
(10)炭化珪素系ハニカム構造体と、前記炭化珪素系ハニカム構造体の外周を覆う外周コート層を有する外周コート炭化珪素系ハニカム構造体であって、
前記外周コート層は、化学成分として炭化珪素を55〜95質量%、二酸化珪素を5〜30質量%含むセラミック粉末(A)を20〜75質量%含む外周コート炭化珪素系ハニカム構造体。
(11)前記セラミック粉末(A)は、前記炭化珪素系ハニカム構造体と同組成である(10)に記載の外周コート炭化珪素系ハニカム構造体。
(12)前記外周コートの熱膨張係数と、前記炭化珪素系ハニカム構造体の熱膨張係数との比が0.8〜1.1である(10)又は(11)に記載の外周コート炭化珪素系ハニカム構造体。
(13)炭化珪素系ハニカム構造体の外周をコーティングする方法であって、
前記炭化珪素系ハニカム構造体の外周に、(1)〜(9)のいずれかに記載のコーティング材を塗布し、塗布された前記コーティング材を乾燥させて外周コート層を形成する工程を含む方法。
図1には、本発明の一実施形態のハニカム構造体を模式的に示す斜視図が記載されている。図示のハニカム構造体100は外周側壁102と、外周側壁102の内側に配設され、第一底面104から第二底面106まで平行に延び、第一底面104が開口して第二底面106に突出する目封止部を有する複数の第1セル108と、外周側壁102の内側に配設され、第一底面104から第二底面106まで平行に延び、第一底面104に突出する目封止部を有し、第二底面106が開口する複数の第2セル110とを備える。また、図示のハニカム構造体100においては、第1セル108及び第2セル110を区画形成する多孔質の隔壁112を備えており、第1セル108及び第2セル110が隔壁112を挟んで交互に隣接配置されており、両底面は市松模様を形成する。図示の実施形態に係るハニカム構造体においては、すべての第1セル108が第2セル110に隣接しており、すべての第2セル110が第1セル108に隣接している。しかしながら、必ずしもすべての第1セル108が第2セル110に隣接していなくてもよく、必ずしもすべての第2セル110が第1セル108に隣接していなくてもよい。セル108、110の数、配置、形状等及び隔壁112の厚み等は制限されず、必要に応じて適宜設計することができる。
本実施形態のコーティング材は、化学成分として炭化珪素を55〜95質量%、二酸化珪素を5〜30質量%含むセラミック粉末(A)を20〜75質量%含む。ここで「化学成分として」というのは、炭化珪素又は二酸化珪素という化学組成であればよく、結晶質、非結晶質など存在の形態を問わないということである。
本発明の外周コート炭化珪素系ハニカム構造体は、前述の炭化珪素系ハニカム構造体と、本発明の炭化珪素系ハニカム構造体の外周を覆う外周コート層を有する。そのため、当該外周コート層は、化学成分として炭化珪素を55〜95質量%、二酸化珪素を5〜30質量%含むセラミック粉末(A)を20〜75質量%含む。なお、セラミック粉末(A)として炭化珪素系ハニカム構造体の研削屑又は粉砕屑を使用する場合、セラミック粉末(A)は、炭化珪素系ハニカム構造体と同組成とある。
次に、本発明の炭化珪素系ハニカム構造体の外周をコーティングする方法の一の実施形態について説明する。本実施形態の炭化珪素系ハニカム構造体の外周をコーティングする方法は、多孔質の隔壁を有し、隔壁によって複数のセルが区画形成されたハニカム構造体の外周面に、これまでに説明した、本発明のコーティング材を塗布し、塗布したコーティング材を乾燥させて外周コート層を形成する工程を備えた方法である。
焼成後の組成が炭化珪素:珪素:二酸化珪素=70:18:12となるように混合した珪素−炭化珪素原料粉末に、成形助剤、造孔剤、及び水を加え、混合・混練して坏土を調製した。得られた坏土を押出成形し、縦42mm、横42mm、高さ141mmの直方体状未焼成ハニカム成形体を作製し、このハニカム成形体を乾燥、焼成してハニカムセグメントを作製した。
クラック・ヒケの評価はハニカム構造体の外周コート表面全体を目視観察することで行った。クラックについては、クラックが全く発見されなかったものを「良」、クラック長さが5mm以下の微小クラックのみが発見されたものを「可」、クラック長さが5mmを超えるクラックが発見されたものを「不可」とした。ヒケについてはコーティング材に筋状あるいは小穴状に基材が露出してしまったものをヒケと定義し、ヒケが全く発見されなかったものを「良」、5mm以下の微小なヒケのみが発見されたものを「可」、5mmを超えるヒケが発見されたものを「不可」とした。
耐熱衝撃性は急速冷却試験(電気炉スポーリング試験)で評価を行った。ハニカム構造体を電気炉にて所定の開始温度(350℃または400℃)で2時間加熱し、全体を均一な温度にした後、電気炉から取り出して、室温まで急速冷却した。そして、その急速冷却後、ハニカム構造体にクラックが発生していたか否かにより、耐熱衝撃性を評価した。開始温度400℃でクラックの発生が認められない場合を「良」、開始温度400℃でクラックの発生が認められるが、開始温度350℃でクラックの発生が認められない場合を「可」、開始温度350℃でクラックの発生が認められる場合を「不可」とした。
レーザーによって発色した印字部分と、非照射部分とのコントラストを、ISO/IEC15415に適合したバーコードリーダーを用いた読み取り試験(印字バーコード読み取り試験)で評価した。評価は以下の基準で実施した。なお、下記基準における「読み取りグレード」は、ISO/IEC15415の規格によるものである。
読み取りグレードA:コントラストが良好で、印字部分を良好に判読可能。
読み取りグレードB〜D:印字部分の判読が可能。
読み取りグレードF:印字部分と非照射部分とのコントラストが悪く、判読が困難。
表1に示される結果から、本発明の実施例では、比較例に比べてクラック・ヒケが有効に抑制され、耐熱衝撃性も優れていることが理解できる。特に、セラミック粉末(B)を20〜50質量%含むコーティング材を使用する実施例ではレーザー印字性も優れていることが分かる。
102 外周側壁
104 第一底面
106 第二底面
108 第1セル
110 第2セル
112 隔壁
Claims (10)
- 炭化珪素系ハニカム構造体用コーティング材であって、
化学成分として炭化珪素を55〜95質量%、二酸化珪素を5〜30質量%含むセラミック粉末(A)を20〜75質量%含み、
前記セラミック粉末(A)のレーザー回折・散乱法による粒度分布測定における体積基準D50が8〜30μmであり、前記セラミック粉末(A)のレーザー回折・散乱法による粒度分布測定における体積基準D10が1〜4μmであり、D90が20〜75μm(ただし、D90>D50。)であり、
前記セラミック粉末(A)は、前記炭化珪素系ハニカム構造体と同組成であるコーティング材。 - 前記セラミック粉末(A)は、前記炭化珪素系ハニカム構造体の研削屑又は粉砕粉である請求項1に記載のコーティング材。
- さらに、白色又は淡色のセラミック粉末(B)を20〜50質量%含む請求項1又は2に記載のコーティング材。
- 前記セラミック粉末(B)は、コージェライト、窒化珪素、アルミナ、ムライト、ジルコニア、燐酸ジルコニウム、チタニア及びアルミニウムチタネートからなる群より選択される少なくとも一種である請求項3に記載のコーティング材。
- 前記セラミック粉末(B)のレーザー回折・散乱法による粒度分布測定における体積基準D50が1〜40μmである請求項3又は4に記載のコーティング材。
- 前記コーティング材を600℃で30分乾燥した後の熱膨張係数と、前記炭化珪素系ハニカム構造体の熱膨張係数との比が0.8〜1.1である請求項1〜5のいずれかに記載のコーティング材。
- さらに、有機物を含む中空粒子を0.1〜4質量%含み、前記中空粒子のレーザー回折・散乱法による粒度分布測定における体積基準D50が35〜55μmである請求項1〜6のいずれかに記載のコーティング材。
- 炭化珪素系ハニカム構造体と、前記炭化珪素系ハニカム構造体の外周を覆う外周コート層を有する外周コート炭化珪素系ハニカム構造体であって、
前記外周コート層は、化学成分として炭化珪素を55〜95質量%、二酸化珪素を5〜30質量%含むセラミック粉末(A)を20〜75質量%含み、
前記セラミック粉末(A)のレーザー回折・散乱法による粒度分布測定における体積基準D50が8〜30μmであり、前記セラミック粉末(A)のレーザー回折・散乱法による粒度分布測定における体積基準D10が1〜4μmであり、D90が20〜75μm(ただし、D90>D50。)であり、
前記セラミック粉末(A)は、前記炭化珪素系ハニカム構造体と同組成である外周コート炭化珪素系ハニカム構造体。 - 前記外周コートの熱膨張係数と、前記炭化珪素系ハニカム構造体の熱膨張係数との比が0.8〜1.1である請求項8に記載の外周コート炭化珪素系ハニカム構造体。
- 炭化珪素系ハニカム構造体の外周をコーティングする方法であって、
前記炭化珪素系ハニカム構造体の外周に、請求項1〜7のいずれかに記載のコーティング材を塗布し、塗布された前記コーティング材を乾燥させて外周コート層を形成する工程を含む方法。
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