JP6630770B2 - 保護セラミックコーティングを有するセラミックス基複合材料(cmc)の処理方法 - Google Patents
保護セラミックコーティングを有するセラミックス基複合材料(cmc)の処理方法 Download PDFInfo
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- JP6630770B2 JP6630770B2 JP2018079603A JP2018079603A JP6630770B2 JP 6630770 B2 JP6630770 B2 JP 6630770B2 JP 2018079603 A JP2018079603 A JP 2018079603A JP 2018079603 A JP2018079603 A JP 2018079603A JP 6630770 B2 JP6630770 B2 JP 6630770B2
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- ceramic
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- silicon
- silicon carbide
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- 238000000034 method Methods 0.000 title claims description 49
- 238000005524 ceramic coating Methods 0.000 title claims description 46
- 230000001681 protective effect Effects 0.000 title claims description 42
- 239000011153 ceramic matrix composite Substances 0.000 title claims description 20
- 239000000919 ceramic Substances 0.000 claims description 115
- 239000002002 slurry Substances 0.000 claims description 94
- 239000000835 fiber Substances 0.000 claims description 72
- 239000010410 layer Substances 0.000 claims description 68
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 54
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 54
- 239000002245 particle Substances 0.000 claims description 52
- 229920000642 polymer Polymers 0.000 claims description 47
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 39
- 229910052710 silicon Inorganic materials 0.000 claims description 39
- 239000010703 silicon Substances 0.000 claims description 39
- 239000002344 surface layer Substances 0.000 claims description 39
- 239000007787 solid Substances 0.000 claims description 33
- 239000002131 composite material Substances 0.000 claims description 31
- 238000001764 infiltration Methods 0.000 claims description 21
- 230000008595 infiltration Effects 0.000 claims description 21
- 238000000197 pyrolysis Methods 0.000 claims description 21
- 230000009969 flowable effect Effects 0.000 claims description 20
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 18
- 239000004917 carbon fiber Substances 0.000 claims description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- 239000012768 molten material Substances 0.000 claims description 15
- 239000011159 matrix material Substances 0.000 claims description 11
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 9
- 239000003125 aqueous solvent Substances 0.000 claims description 8
- 239000003960 organic solvent Substances 0.000 claims description 8
- 239000013618 particulate matter Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- 239000006229 carbon black Substances 0.000 claims description 5
- 229910003460 diamond Inorganic materials 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 239000010937 tungsten Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000000151 deposition Methods 0.000 claims description 3
- 229920001558 organosilicon polymer Polymers 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims 2
- 239000012530 fluid Substances 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000000626 liquid-phase infiltration Methods 0.000 description 13
- 229910052799 carbon Inorganic materials 0.000 description 11
- 229920003257 polycarbosilane Polymers 0.000 description 9
- 238000000576 coating method Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910000676 Si alloy Inorganic materials 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 229920002873 Polyethylenimine Polymers 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- -1 polysiloxanes Polymers 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XWMKELOZYZOSKN-UHFFFAOYSA-N 1-[1-butyl-2-oxo-4-[3-(pyridin-3-ylmethoxy)phenyl]-1,8-naphthyridin-3-yl]-3-[2,6-di(propan-2-yl)phenyl]urea Chemical compound CC(C)C=1C=CC=C(C(C)C)C=1NC(=O)NC=1C(=O)N(CCCC)C2=NC=CC=C2C=1C(C=1)=CC=CC=1OCC1=CC=CN=C1 XWMKELOZYZOSKN-UHFFFAOYSA-N 0.000 description 1
- 229910052580 B4C Inorganic materials 0.000 description 1
- 239000011184 SiC–SiC matrix composite Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- INFDPOAKFNIJBF-UHFFFAOYSA-N paraquat Chemical compound C1=C[N+](C)=CC=C1C1=CC=[N+](C)C=C1 INFDPOAKFNIJBF-UHFFFAOYSA-N 0.000 description 1
- 229920005596 polymer binder Polymers 0.000 description 1
- 239000002491 polymer binding agent Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B18/00—Layered products essentially comprising ceramics, e.g. refractory products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
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Description
本特許文献は、米国特許法第119条(e)の下で、2017年11月21日に出願された米国特許出願第62/589,181号、及び2017年4月19日に出願された米国特許出願第62/487,284号に対する優先権の利益を主張する。これらの出願は両方とも、参照によりそれら全体が本明細書に組み込まれる。
SiC粒子を充填したSiC繊維骨格を含む含浸繊維プリフォームを、当該技術分野で知られている繊維集合方法及びスラリー浸透方法によって形成する。スラリー浸透の後、炭素繊維ベールを、この例ではサイズ約5cm×15cmのパネルである含浸繊維プリフォームの第1の表面に適合するように切断し、炭素繊維ベールを第1の表面に適用する。炭素繊維ベールの厚さは約0.13mmである。表面スラリーは、ポリカルボシランと公称サイズで約3.5ミクロンのSiC粒子とを混合することによって形成する。SiCボールを使用して、ボールミルで約4時間混合を行う。完全に混合した後、表面スラリーを炭素繊維ベールの上に広げて繊維プリフォームの表面に塗布し、余分な表面スラリーを除去する。繊維プリフォームを反対側にひっくり返して、繊維プリフォームの第2の表面を露出させ、炭素繊維ベールを第2の表面に適用するステップ、表面スラリー配合物を炭素繊維ベールの上に塗布するステップ、次いで余分な表面スラリーを除去するステップを含むプロセスを繰り返す。表面スラリーでコーティングした後、コーティングされたプリフォームを鋼板の間に置き、空気中で230℃の温度で1時間ホットプレスして、表面スラリー配合物を「プレス硬化」させて、硬化ポリカルボシランマトリックス中にSiC粒子及び炭素繊維ベールを含む複合層を形成する。硬化後、コーティングされたプリフォームを、制御環境において(例えば、アルゴン分圧下で)、1000℃の温度で1時間加熱して、硬化ポリカルボシランを熱分解させ、それによって、含浸繊維プリフォーム上に(炭素繊維ベール由来の)炭素を含む多孔質セラミックコーティングを形成する。熱分解後、含浸繊維プリフォーム及びその上を覆っているコーティングに、ケイ素の溶融温度(Tm)以上の温度でケイ素を含む溶融物を浸透させて、これにより、緻密化されたセラミックス基複合体及び保護セラミックコーティングを形成する。上記のように形成されたCMC本体430及び保護セラミックコーティング440の断面図を、図4の画像に示す。
SiC粒子を充填したSiC繊維骨格を含む含浸繊維プリフォームを、当該技術分野で知られている繊維集合方法及びスラリー浸透方法によって形成する。繊維プリフォームのスラリー浸透の後、表面スラリーを、水と公称サイズで約3.5ミクロンのSiC粒子とを混合することによって形成する。先の実施例と同様に、SiCボールを使用して、ボールミルで約4時間混合を行ってもよい。結合剤、分散剤及び/又は反応性元素(1つ又は複数)も表面スラリーに含まれていてもよい。この実施例における固体含量は約20体積%である。完全に混合した後、表面スラリーを含浸繊維プリフォームの表面に塗布し、乾燥して、SiC粒子の乾燥多孔質層を形成する。次に、乾燥多孔質層上にポリカルボシランを堆積して、SiC粒子間のスペースに浸漬又は浸透させ、余分なポリカルボシランを除去し、230℃で1時間加熱することにより硬化ポリカルボシラン及びSiC固体粒子を含む複合層を形成する。硬化後、複合層を、制御環境において(例えば、アルゴン分圧下で)、1000℃の温度で1時間加熱して、硬化ポリカルボシランを熱分解させ、含浸繊維プリフォーム上に多孔質セラミックコーティングを形成する。熱分解後、繊維プリフォーム及びその上を覆っている多孔質コーティングに、ケイ素の溶融温度(Tm)以上の温度でケイ素を含む溶融物を浸透させて、これにより、緻密化されたセラミックス基複合体及び保護セラミックコーティングを形成する。CMC本体530及び保護セラミックコーティング540の断面図を、図5の画像に示す。
6.3gのSMP-500(Starfire(登録商標)Systems)を、3gのSiC粉末と完全に混合する。得られたポリマー/SiCスラリー混合物(「第1の表面スラリー」)を、厚さ0.005"の炭素ベールに含浸させ、スラリー浸透した2"×6"繊維プリフォームの両面に塗布する。スラリーでコーティングされた含浸繊維プリフォームを、ステンレス工具の間に置き、第1の表面スラリーを230℃で硬化させてプリフォームの両面に複合層を形成する。次いで、複合層を部分Ar雰囲気の減圧下、1300℃で熱分解して、プリフォーム上に多孔質セラミック層を形成する。SiC粒子、分散剤、結合剤及び水を含む第2の表面スラリーを調製し、多孔質セラミック層に真空含浸させてすべての熱分解クラックを埋める。乾燥すると、第2の表面スラリーは、表面層を形成し、この表面層は、溶融浸透の前に(例えば、220グリットサンドペーパーで)研磨してもよい。図6の光学顕微鏡写真は、CMC本体630上を覆っている保護セラミックコーティング640上にある、得られた緻密化された表面層650の典型的な微細構造を示す。顕著な熱分解クラックは観察されない。
322 熱分解クラック
324 多孔質セラミック層
326 含浸繊維プリフォーム
430 CMC本体
440 保護セラミックコーティング
530 CMC本体
540 保護セラミックコーティング
630 CMC本体
640 保護セラミックコーティング
650 表面層
Claims (20)
- 保護セラミックコーティングを有するセラミックス基複合材料の製造方法であって、
粒子状物質を充填したセラミック繊維骨格を含む含浸繊維プリフォームの外表面上に第1の表面スラリーを塗布するステップであって、第1の表面スラリーがケイ素を含む流動性プレセラミックポリマー中に分散したセラミック固体粒子を含むステップ、
流動性プレセラミックポリマーを硬化させて複合層を外表面上に形成するステップであって、複合層が、セラミック固体粒子が分散された硬化したプレセラミックポリマーを含むステップ、
硬化したプレセラミックポリマーを熱分解して外表面上に炭化ケイ素を含む多孔質セラミック層を形成するステップ、
含浸繊維プリフォーム及び多孔質セラミック層にケイ素を含む溶融材料を浸透させるステップ、並びに
浸透後、溶融材料を冷却して、それによって保護セラミックコーティングを上に有するセラミックス基複合体を形成するステップ
を含む方法。 - 第1の表面スラリーを塗布する前に、外表面上に炭素繊維ベールを配置するステップをさらに含み、外表面に第1の表面スラリーを塗布するステップが炭素繊維ベールの上に第1の表面スラリーを堆積させるステップを含む、請求項1に記載の方法。
- セラミック固体粒子が炭化ケイ素及び/又は窒化ケイ素を含み、
第1の表面スラリーが、カーボンブラック、ダイヤモンド、グラファイト、モリブデン及びタングステンからなる群から選択される、1つ以上の反応性元素をさらに含む、請求項1に記載の方法。 - 熱分解の後及び浸透の前に、
第2の表面スラリーを多孔質セラミック層上に塗布して熱分解中に形成されたクラックを埋めるステップであって、第2の表面スラリーが水性又は有機溶媒中に分散したセラミック粒子を含むステップ、及び
第2の表面スラリーを乾燥させて多孔質セラミック層上に表面層を形成するステップをさらに含み、
浸透及び冷却が、保護セラミックコーティング上に緻密化された表面層を形成するための表面層の浸透及び冷却を含む、請求項1に記載の方法。 - セラミック粒子が炭化ケイ素及び/又は窒化ケイ素を含み、
第2の表面スラリーが、グラファイト、ダイヤモンド、カーボンブラック、モリブデン及びタングステンからなる群から選択される、1つ以上の反応性元素をさらに含む、請求項4に記載の方法。 - 第2の表面スラリーが、約10体積%〜約70体積%の固体含量を含む、請求項4に記載の方法。
- 緻密化された表面層が、保護セラミックコーティングよりも多量の残留ケイ素を含む、請求項4に記載の方法。
- 流動性プレセラミックポリマーを硬化させるステップが、150℃〜400℃の範囲の温度で加熱するステップを含み、
熱分解するステップが、複合層を850℃〜1300℃の範囲の温度に加熱するステップを含む、請求項1に記載の方法。 - 硬化させるステップが、圧力を加えるステップをさらに含む、請求項8に記載の方法。
- プレセラミックポリマーが、有機ケイ素ポリマー及び/又は無機ケイ素ポリマーを含む、請求項1に記載の方法。
- セラミックス基複合体が、炭化ケイ素マトリックスに埋め込まれた炭化ケイ素繊維を含み、
保護セラミックコーティングが、20体積%以下の残留ケイ素で炭化ケイ素を含む、請求項1に記載の方法。 - 保護セラミックコーティングを有するセラミックス基複合材料の製造方法であって、
粒子状物質を充填したセラミック繊維骨格を含む含浸繊維プリフォームの外表面上に第1の表面スラリーを塗布するステップであって、第1の表面スラリーが溶媒中に分散したセラミック固体粒子を含むステップ、
第1の表面スラリーを乾燥させてセラミック固体粒子を含む乾燥多孔質層を形成するステップ、
ケイ素を含む流動性プレセラミックポリマーを乾燥多孔質層に浸透させるステップ、
流動性プレセラミックポリマーを硬化させて複合層を外表面上に形成するステップであって、複合層が、セラミック固体粒子が分散された硬化したプレセラミックポリマーを含むステップ、
硬化したプレセラミックポリマーを熱分解して外表面上に炭化ケイ素を含む多孔質セラミック層を形成するステップ、
含浸繊維プリフォーム及びその外表面上の多孔質セラミック層にケイ素を含む溶融材料を浸透させるステップ、並びに
溶融材料による浸透後、溶融材料を冷却して、保護セラミックコーティングを上に有するセラミックス基複合体を形成するステップ
を含む方法。 - 流動性プレセラミックポリマーを硬化させるステップが、150℃〜400℃の範囲の温度で加熱するステップを含み、
熱分解するステップが、複合層を850℃〜1300℃の範囲の温度に加熱するステップを含む、請求項12に記載の方法。 - 硬化させるステップが、圧力を加えるステップをさらに含む、請求項13に記載の方法。
- プレセラミックポリマーが、有機ケイ素ポリマー及び/又は無機ケイ素ポリマーを含む、請求項12に記載の方法。
- 熱分解の後及び浸透の前に、
第2の表面スラリーを多孔質セラミック層上に塗布して熱分解中に形成されたクラックを埋めるステップであって、第2の表面スラリーが水性又は有機溶媒中に分散したセラミック粒子を含むステップ、及び
第2の表面スラリーを乾燥させて多孔質セラミック層上に表面層を形成するステップをさらに含み、
浸透及び冷却が、保護セラミックコーティング上に緻密化された表面層を形成するための表面層の浸透及び冷却を含む、請求項12に記載の方法。 - セラミック粒子が炭化ケイ素及び/又は窒化ケイ素を含み、
第2の表面スラリーが、グラファイト、ダイヤモンド、カーボンブラック、モリブデン及びタングステンからなる群から選択される、1つ以上の反応性元素をさらに含む、請求項16に記載の方法。 - 第2の表面スラリーが、約10体積%〜約70体積%の固体含量を含む、請求項16に記載の方法。
- 緻密化された表面層が、保護セラミックコーティングよりも多量の残留ケイ素を含む、請求項16に記載の方法。
- セラミックス基複合体が、炭化ケイ素マトリックスに埋め込まれた炭化ケイ素繊維を含み、
保護セラミックコーティングが、20体積%以下の残留ケイ素で炭化ケイ素を含む、請求項12に記載の方法。
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