JP6840787B2 - 鋼本体をコーティングする方法 - Google Patents
鋼本体をコーティングする方法 Download PDFInfo
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- JP6840787B2 JP6840787B2 JP2019098016A JP2019098016A JP6840787B2 JP 6840787 B2 JP6840787 B2 JP 6840787B2 JP 2019098016 A JP2019098016 A JP 2019098016A JP 2019098016 A JP2019098016 A JP 2019098016A JP 6840787 B2 JP6840787 B2 JP 6840787B2
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Description
a.混合:0.8ミクロンの平均粒径を有する144kgの炭化タングステン(WC)、約1ミクロンの平均粒径を有する30kgの鉄(Fe)粉末、1〜2ミクロンの平均粒径を有する15kgの炭化クロム(Cr3C2)粉末、6kgのケイ素(Si)粉末および4kgのパラフィンワックスを、粉砕媒体としてアルコール、および、800kgの合計質量を有する複数のセメント炭化タングステンボールを用いたアトリタ製粉機(attritor mill)で粉末を一緒に3時間粉砕することで混合し、前駆材料スラリーを得た。スラリーを乾燥させて混合粉末を得、および凝集体を粉砕してゆるい粉末を得た。
b.第1の顆粒化:粉末を結合材料と一緒に回転ドラム内で回転させることで顆粒化し、ふるいにかけて、約75〜約225ミクロンの平均サイズを有する複数の顆粒を得、複数の「未完成の」顆粒(すなわち、結合材料によってまとまっている粉末粒子を含んでなる顆粒)を得た。
c.予備加熱処理:未完成の顆粒を黒鉛の箱に配置し、1020℃の温度まで加熱した。この温度は、材料の液体相焼結が実質的に一切起こらないよう十分低く、かつ、実質的に全ての結合材料が取り除かれるよう十分高く、粉末の固体相焼結が取り扱いに十分な強度を顆粒に提供するのに十分な温度であった。
d.第2の顆粒化:加熱処理のあと、顆粒をふるいにかけて約75〜225ミクロンの直径を有する複数の顆粒を選択した。
e.焼結加熱処理:選択した顆粒を次いで黒鉛の箱の中に置き、真空下の1160℃で、45分焼結し、顆粒の実質的な液体相焼結を可能にし、焼結顆粒を得た。焼結プロセスの間、一定の量の炭化クロム(Cr3C2)が分解するであろう一方で、比較的少量のWCのみが結合材料に溶解し得る。特定の仮説に限定することは望まないが、可能性として、実質的に全ての炭化クロム(Cr3C2)が液体結合材料に溶解し得、鉄族金属(FeまたはCoといった)、CrおよびCを含んでなる混合炭化化合物材料の結晶化が、材料の固化の際に起こり得る。溶解したWCの量は、およそ5〜8質量%であり、最大およそ1.5〜2.5原子%に対応し、これは、結合材料の溶融温度に実質的に影響を及ぼさないであろう。顆粒が実際よりも実質的に多くの鉄を含有した場合、顆粒の実質的な溶融は高くなり、焼結加熱処理の終わりには、鉄ベース材料の硬くて大きい集合体がもたらされ、集合体を粉砕して第1の複数の顆粒を得るのは大変困難であっただろう。しかし、顆粒に存在する鉄が少なすぎる場合、材料の十分な液体相焼結が起こらず、顆粒は十分な強度を欠けていただろう。例えば、複数の鉄に富んだ顆粒をさらに導入する必要性を避けて、溶射プロセスに関して、たった一組の複数の顆粒を提供および使用しようとした場合、顆粒は、この実施例で使用される15質量%の代わりに、約69質量%の鉄を含んでなる必要があり、顆粒化が実行不可能なほど困難になり得る鉄ベースの硬い本体になっていただろう。
f.第3の顆粒化:焼結顆粒をアルゴン(Ar)雰囲気の50barの圧力下で熱間静水圧加圧(HIP)し、圧縮された本体を得た。圧縮された本体を次いで粉砕し、約60〜180ミクロンのサイズを有する顆粒を、ふるいにかけて選択し、第1の複数の顆粒を得た。
Claims (7)
- 鋼本体をコーティングする方法であって:
第1の源から複数の顆粒を準備することであって、各顆粒は、炭化タングステン(WC)、ケイ素(Si)、炭素(C)、クロム(Cr)および鉄(Fe)から成り、各顆粒は、所定の相対量のWC、Si、CおよびCrを含み、各第1の源の顆粒は、閾値量未満のFeを含む、複数の顆粒を準備すること;
少なくともFeから成る第2の源を顆粒形態で準備すること;
コーティングされる鋼本体の形状、サイズおよび組成を考慮して第1の源の顆粒と第2の源の顆粒の比率を調節すること;
前記第1の源の顆粒および前記第2の源の顆粒の組み合わせを、少なくとも前記閾値量のFeがWC、Si、CおよびCrに混合されるように形成することであって、前記組み合わせにおけるWC、Si、C、CrおよびFeの相対量は、WC、Si、C、CrおよびFeを含んでなる溶融相が1300℃未満の溶融温度で形成されるような相対量であるように前記組み合わせを形成すること;
その後、前記第1の源の顆粒および前記第2の源の顆粒の組み合わせを、少なくとも前記溶融温度まで加熱し、前記溶融相を形成すること;
その後、前記鋼本体に前記溶融層を適用すること;および、
加熱をやめて前記溶融相を固化させてコーティングされた鋼本体を提供すること、を含む、前記方法。 - 前記溶融温度が1280℃以下である、請求項1に記載の方法。
- 前記加熱がレーザービームによって達成されるレーザークラッディングプロセス;前記加熱が電子ビームによって達成される電子ビームプロセス;または、前記加熱がアークプラズマによって達成されるアークプラズマ溶射プロセスを用いることを含む、請求項1または請求項2に記載の方法。
- 前記鋼本体がFeの更なる源を含んでなる、請求項1〜3のいずれか一項に記載の方法。
- 前記第1の源の顆粒がFeの閾値量の20〜60パーセントを含んでなる、請求項1〜4のいずれか一項に記載の方法。
- 各第1の源の顆粒が、ケイ素Si、炭化クロムおよび鉄(Fe)を含んでなり;炭化クロムの質量がSiの質量の1.5〜7倍であり、Feの質量がSiの質量の2〜8倍である、請求項1〜5のいずれか一項に記載の方法。
- 前記第1の源の顆粒および前記第2の源の顆粒をアークプラズマ溶射装置の供給機構に導入すること、および、前記装置を用いて鋼本体上にコーティングを作製することを含み;ここで、前記アークプラズマ溶射装置は、プラズマノズルからプラズマジェットを作製するためのプラズマトーチ、および、前記顆粒を使用中の前記プラズマジェットに誘導するための前記供給機構を含んでなり;前記供給機構は、誘導チャンバーおよび移動可能な誘導機構を含んでなり;前記供給機構は、前記誘導機構が前記プラズマトーチから離れている時に供給オリフィスを提供可能であり;また、前記誘導チャンバーが前記顆粒を前記供給オリフィスに誘導可能であり、前記顆粒は前記供給オリフィスを通って前記誘導チャンバーから移動し、前記誘導機構の移動に対応して前記プラズマノズルから可変な距離にある前記プラズマジェットに入り得るよう構成され;前記誘導機構の位置を、どの溶融相も使用中の装置に接触しないように調節することを含む、請求項1〜6のいずれか一項に記載の方法。
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| JP6764228B2 (ja) * | 2015-12-22 | 2020-09-30 | 株式会社フジミインコーポレーテッド | 粉末積層造形に用いるための造形用材料 |
| WO2017113163A1 (zh) * | 2015-12-30 | 2017-07-06 | 四川蓝光英诺生物科技股份有限公司 | 生物打印机喷头组件及生物打印机 |
| NL2017180B1 (en) * | 2016-07-18 | 2018-01-24 | Ihc Holland Ie Bv | Additive manufactured tooth for dredging or mining |
| RU2641427C1 (ru) * | 2016-07-20 | 2018-01-17 | Федеральное государственное бюджетное научное учреждение "Федеральный научный агроинженерный центр ВИМ" (ФГБНУ ФНАЦ ВИМ) | Способ нанесения многокомпонентного покрытия при электродуговой металлизации |
| JP6942014B2 (ja) * | 2017-09-26 | 2021-09-29 | 技術研究組合次世代3D積層造形技術総合開発機構 | ノズル及び積層造形装置 |
| KR102143880B1 (ko) * | 2018-05-30 | 2020-08-12 | 비즈 주식회사 | 이형 용가재를 사용하는 고적층율 금속 3d 아크 프린터 |
| FR3083473B1 (fr) * | 2018-07-07 | 2021-12-24 | Nantes Ecole Centrale | Dispositif et procédé de dépose d’un matériau granulaire pour la fabrication additive |
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| DE102019205254A1 (de) * | 2019-04-11 | 2020-10-15 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum generativen Herstellen eines Werkstücks und Werkstück |
| JP7184713B2 (ja) * | 2019-07-31 | 2022-12-06 | 技術研究組合次世代3D積層造形技術総合開発機構 | ノズル及び積層造形装置 |
| JP7309544B2 (ja) * | 2019-09-13 | 2023-07-18 | 株式会社東芝 | コーティング方法及びコーティング構造 |
| CN111024772B (zh) * | 2019-12-03 | 2022-06-14 | 西安科技大学 | 激光熔覆熔池微电阻分布成像方法与装置 |
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