플라즈마 스프레이를 이용한 세라믹 코팅층의 부식특성에 관한 연구

김동화,송요승,윤종구,채경선,안준홍 한국 항공대학교 항공산업기술연구소 1999 航空宇宙産業技術硏究所 硏究誌 Vol.9 No.-

여러 산업체에선 한계된 금속의 성질을 필요한 용도에 맞게 합금원소를 첨가하므로써 개선해 왔으나, 이는 제한된 범위를 가지고 있으며, 그 효과가 작다. 최근에는 금속표면에 피막을 입혀 효율적으로 제품을 개선하여 생산하고 있다. 피막을 입히는 기술로는 용사법을 비롯하여 CVD, PVD, 양극산화법, 전기 및 화학도금등 그 종류는 다양하다. 금속위에 표면처리를 하여 세라믹피막을 얻으므로써 단열피복, 내마모성, 내식성, 내열성, 열전도 차폐등 물리적, 기계적 성질을 개선하고 있다. 이번 연구에서는 표면에 세라믹 보호 피막을 생성하는 process로 plasma spray법을 이용하여 Titanium 모재위에 Cr₂O₃-TiO₂, Al₂O₃-TiO₂,그리고 NiCoCrAlYO₂의 4종류의 세라믹 powder로 용사층을 형성, 물리적 특성을 분석하였고, 또한 bond coating 재료로는 NiCoCrAlYO₂분말을 사용하여 bond coating을 형성시키기 전과 후의 물성을 비교하였다. 특히 세라믹 피막의 기공도시험, 표면거칠기시험등을 통하여 피막의 내식성향상에 어떠한 영향을 주는지 XRD, SEM, 전기화학적 분극시험을 통해 중점적으로 연구하였다. 연구 결과 Al₂O₃-TiO₂피막층과 NiCoCrAlYO₂(bond coating layer)+Al₂O₃-TiO₂피막층이 우수한 내식성을 나타내며, 대체적으로 bond coating layer가 존재하지 않는 피막의 기공도와 표면거칠기의 평균값이 낮게 나오며, 내식성 역시 우수한 것으로 확인하였다. The ceramic material coating is used to protecting the underground pipe, ship, and water tank from corrosion environment. Recently, an advanced nation has made a lot of study to develop the semi-permanent insoluble cell using ceramic coating on valve metal(substrate). Therefore in this study the plasma spray method was used to make the protection coating. The ceramic materials for coatings were Cr₂O₃-TiO₂, Al₂O₃-TiO₂and the bond coating materials for bond strength was NiCoCrAlYO₂. As a results, the Al₂O₃-TiO₂ coating without bond coating(NiCoCrAlYO₂) represent the excellent anticorrosion property against corrosion environment.

Ni 본드코팅이 Al 기지에 고온 용사 코팅된 Fe 코팅층의 접합특성에 미치는 영향

권의표,김대영,이종권,Kwon, Eui-Pyo,Kim, Dae-Young,Lee, Jong-Kweon 한국재료학회 2016 한국재료학회지 Vol.26 No.10

The influence of NiCrAlY bond coating on the adhesion properties of an Fe thermal coating sprayed on an Al substrate was investigated. By applying a bond coat, an adhesion strength of 21MPa was obtained, which was higher than the 15.5MPa strength of the coating without the bond coat. Formation of cracks at the interface of the bond coat and the Al substrate was suppressed by applying the bond coat. Microstructural analysis of the coating interface using EBSD and TEM indicated that the dominant bonding mechanism was mechanical interlocking. Mechanical interlocking without crack defects in the coating interface may improve the adhesion strength of the coating. In conclusion, the use of an NiCrAlY bond coat is an effective method of improving the adhesion properties of thermal sprayed Fe coatings on Al substrates.

Thermal durability of thermal barrier coatings with bond coat composition in cyclic thermal exposure

Cui, Qizheng,Seo, Seong-Moon,Yoo, Young-Soo,Lu, Zhe,Myoung, Sang-Won,Jung, Yeon-Gil,Paik, Ungyu Elsevier 2015 Surface & coatings technology Vol.284 No.-

<P><B>Abstract</B></P> <P>The effects of bond coat composition on the microstructure evolution and thermal durability of thermal barrier coating (TBC) were investigated through cyclic thermal exposure. The microstructure of the bond coat was controlled using various feedstock powders, such as NiCrAlY, NiCoCrAlY, and CoNiCrAlY, which were coated on the Ni-based substrate using a high-velocity oxy-fuel process. The top coat was prepared with high purity feedstock powder (METCO 204 C-XCL) using an air plasma spray (APS) process. The thermal durability of the TBCs was evaluated through the cyclic thermal fatigue (CTF) and thermal shock (TS) tests, including the microstructure evolution, the thermally grown oxide (TGO) growth behavior, and thermomechanical properties. After the CTF and TS tests, the TBC with the Ni-based bond coat showed a longer lifetime performance and less degradation in hardness value than those with the Ni–Co- and Co–Ni-based bond coats. The results indicate that the bond coat composition produce an obvious effect on the thermomechanical properties of the TBC system. The relationship between bond coat composition and thermal durability is extensively discussed, based on the microstructure evolution and element diffusion behavior.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Thermal durability in TBCs with bond coat composition has been investigated. </LI> <LI> Cyclic thermal exposure tests were employed in determining thermal durability. </LI> <LI> The TBC with Ni-based bond coat showed a longer lifetime performance in both tests. </LI> <LI> Element Co easily creates the mixed oxide clusters during TGO growth. </LI> <LI> Ni-based bond coat showed a less hardness decrease than other bond coats after both tests. </LI> </UL> </P>

표면처리 및 thermocycling에 따른 Y-TZP와 교정용 금속 브라켓과의 전단결합강도

최지봉,변선미 대한치과재료학회 2020 대한치과재료학회지 Vol.47 No.2

In this study, clinically applicable methods of improving the bond strength between Y-TZP and the bracket were considered, which the method was confirmed for the durability in a humid oral environment. The bond strength of Y-TZP bonding surface and the surface characteristics were analyzed following the surface treatment of Y-TZP specimens with conditioning by 30 µm tribochemical silica coating, or tribochemical silica coating with one of the following primers: silane, MDP, or an MDP-containing silane primer. It was found that after surface treatment, the surface roughness of all groups increased (p<0.05), and Si was uniformly distributed on the Y-TZP surface after silica coating. The bond strength value of the group treated with silane primer and tribochemical coating was not significantly different after thermocycling (p>0.05). The group treated with MDP primer and tribochemical silica coating showed a significant difference in bond strength values after thermocycling (p<0.05), and it showed the lowest bond strength values except the untreated groups (p<0.05). The group treated with tribochemical silica coating and MDP-containing silane primer showed the highest bond strength values (p<0.05), and was not significantly different after thermocycling (p>0.05). Therefore, the surface treatments of Y-TZP with MDP-containing silane primer after 30 µm tribochemical silica coating enhanced the bond strength to the orthodontic metal bracket; such a clinically applicable method may advance studies on the surface treatment of Y-TZP. 심미적인 이유로 성인의 교정치료 비율이 증가하면서 Y-TZP 수복물에 교정용 브라켓을 직접 부착하게 되었다. 그러나, Y-TZP의 높은 안정성으로 인해 결합력을 유지하기 쉽지 않다. 이러한 문제를 해결하기 위해서 Y-TZP의 표면처리방법에 관한 많은 연구가 진행되고 있다. 본 연구에서는 Y-TZP와 금속 브라켓의 결합력을 향상시키는 데 있어, 임상에서실제로 적용하기 간편한 방법을 찾고, 침습적 환경인 구강 내에서 내구성을 갖는 표면처리 방법을 확인하고자 하였다. Y-TZP에 표면처리를 시행한 후 결합강도를 측정하였고, 접착성 결합을 성취하기 위한 요인들을 분석하기 위해서 표면특성의 변화를 관찰하였다. Y-TZP 표면에 30 μm 트리보케미칼 실리카 코팅 후 실란, MDP 및 MDP 함유 실란 프라이머를적용하였다. 표면 처리 후 모든 군의 표면 거칠기는 증가하였으며(p<0.05), 실리카 코팅 후 Y-TZP 표면에 Si가 고르게분포되어 있었다. 트리보케미칼 코팅 후 silane 프라이머를 처리한 군의 전단결합강도는 열순환 처리 후에도 유의한차이를 보이지 않았다(p>0.05). 트리보케미칼 코팅 후 MDP 프라이머를 처리한 군의 전단결합강도는 열순환 처리후에 유의한 차이를 보였으며(p<0.05), 표면처리한 세 군 중에서 가장 낮은 전단결합강도 값을 보였다(p<0.05). 전단결합강도는 트리보케미칼 실리카 코팅 후 MDP 함유 실란 프라이머를 적용하였을 때 가장 높은 값을 보였고(p<0.05), 열순환처리후에도 유의한 차이를 보이지 않았다(p>0.05). 본 연구를 통해 얻은 결과로 Y-TZP에 트리보케미칼 실리카 코팅 후 MDP 함유 실란 프라이머를 적용했을 때 브라켓과의결합력 향상과 함께 구강 내에서도 내구성을 유지할 수 있고, 임상에서 적용하기에도 간편한 방법으로 Y-TZP의 표면처리 연구에 크게 기여할 수 있을 것이라 기대된다.

단결정형 세라믹 브라켓의 재접착 시 tribochemical silica coating이 전단접착강도에 미치는 영향

전영미(Young-Mi Jeon),손우성(Woo-Sung Son),강상욱(Sang-Wook Kang) 대한치과교정학회 2010 대한치과교정학회지 Vol.40 No.3

본 연구는 탈락된 세라믹 브라켓을 tribochemical silica coating하고 nano-filled flowable composite resin (Transbond Supreme LV, 3M Unitek, Monrovia, Calif, USA)을 이용하여 재접착하였을 때 교정치료에 충분한 접착강도를 얻을 수 있는지 평가하기 위해 시행하였다. 총 60개의 소구치를 준비하여 다음의 4개 군으로 나누었다: Tribochemical silica coating (TC) + Transbond Supreme LV (LV), TC + Transbond XT (XT), Sandblast treatment (SA) + LV, SA + XT. 재처리된 세라믹 브라켓은 각각의 접착제를 이용하여 치아에 부착하였다. 시편들을 상온의 생리식염수에 1주일간 보관한 뒤 열순환을 시켰다. 만능시험기로 전단접착강도를 측정한 뒤 파절양상을 평가하였다. TC군은 임상적으로 충분한 강도를 보였다(TCLV: 10.82 ± 1.82 MPa, TCXT: 11.50 ± 1.72 MPa). 하지만 SA군은 TC군에 비하여 유의하게 낮은 전단접착강도를 보였다(SALV: 1.23 ± 1.16 MPa, SAXT: 1.76 ± 1.39 MPa, p < 0.05). LV군과 XT군의 전단접착강도는 유의한 차이가 없었다. TCLV, TCXT군 모두 시편의 77%가 접착제에서의 파절을 보였고, 각 군당 1개씩의 시편에서 법랑질 파절이 관찰되었다. SA군은 모든 파절이 브라켓과 접착제 계면에서 발생하였다. LV군과 XT군의 탈락양상에는 유의한 차이가 없었다. 이상의 연구 결과에서 보면 nano-filled flowable composite resin과 tribochemical silica coating 처리를 이용하여 세라믹 브라켓을 재접착하면 충분한 전단접착강도를 얻을 수 있다. 단 법랑질 파절의 가능성이 있으므로 탈접착 시 적절한 기구와 기술을 이용해 주의깊게 브라켓을 제거해야 한다. Objective: The purpose of this study was to investigate the effect of tribochemical silica coating on the shear bond strength (SBS) of rebonded ceramic brackets using nano-filled flowable composite resin. Methods: A total of 60 premolars were prepared and divided into 4 equal groups as follows: Tribochemical silica coating (TC) + Transbond XT (XT), TC + Transbond supreme LV (LV), Sandblast treatment (SA) + XT, SA + LV. Treated ceramic brackets were rebonded on the premolars using each adhesive. All samples were tested in shear mode on a universal testing machine. Results: SBS of silica coated groups were high enough for clinical usage (TCLV: 10.82 ± 1.82 MPa, TCXT: 11.50 ± 1.72 MPa). But, SBS of the sandblast treated groups had significantly lower values than the tribochemical silica coated groups (SALV, 1.23 ± 1.16 MPa; SAXT, 1.76 ± 1.39 MPa; p < 0.05). There was no difference between the shear bond strength by type of adhesive. In the silica coated groups, 77% of the samples showed bonding failure in the adhesive. In the sandblast treated group, all bonding failures occurred at the bracket-adhesive interface. Conclusions: The result of this study suggest that newly introduced nano-filled flowable composite resin and tribochemical silica coating application on debonded ceramic bracket bases can produce appropriate bond strengths for orthodontic bonding.

Influence of nano-structured alumina coating on shear bond strength between Y-TZP ceramic and various dual-cured resin cements

이정진,최정윤,서재민 대한치과보철학회 2017 The Journal of Advanced Prosthodontics Vol.9 No.2

PURPOSE. The purpose of this study was to evaluate the effect of nano-structured alumina surface coating on shear bond strength between Y-TZP ceramic and various dual-cured resin cements. MATERIALS AND METHODS. A total of 90 disk-shaped zirconia specimens (HASS CO., Gangneung, Korea) were divided into three groups by surface treatment method: (1) airborne particle abrasion, (2) tribochemicalsilica coating, and (3) nano-structured alumina coating. Each group was categorized into three subgroups of ten specimens and bonded with three different types of dual-cured resin cements. After thermocycling, shear bond strength was measured and failure modes were observed through FE-SEM. Two-way ANOVA and the Tukey’s HSD test were performed to determine the effects of surface treatment method and type of cement on bond strength (P<.05). To confirm the correlationof surface treatment and failure mode, the Chi-square test was used. RESULTS. Groups treated with the nanostructured alumina coating showed significantly higher shear bond strength compared to other groups treated with airborne particle abrasion or tribochemical silica coating. Clearfil SA Luting showed a significantly higher shear bond strength compared to RelyX ARC and RelyX Unicem. The cohesive failure mode was observed to be dominant in the groups treated with nano-structured alumina coating, while the adhesive failure mode was prevalent in the groups treated with either airborne particle abrasion or tribochemical silica coating. CONCLUSION. Nano-structured alumina coating is an effective zirconia surface treatment method for enhancing the bond strength between Y-TZP ceramic and various dual-cured resin cements.

Influence of nano-structured alumina coating on shear bond strength between Y-TZP ceramic and various dual-cured resin cements

Jung-Jin Lee,Jung-Yun Choi,Jae-Min Seo 대한치과보철학회 2017 The Journal of Advanced Prosthodontics Vol.9 No.2

PURPOSE. The purpose of this study was to evaluate the effect of nano-structured alumina surface coating on shear bond strength between Y-TZP ceramic and various dual-cured resin cements. MATERIALS AND METHODS. A total of 90 disk-shaped zirconia specimens (HASS CO., Gangneung, Korea) were divided into three groups by surface treatment method: (1) airborne particle abrasion, (2) tribochemicalsilica coating, and (3) nano-structured alumina coating. Each group was categorized into three subgroups of ten specimens and bonded with three different types of dual-cured resin cements. After thermocycling, shear bond strength was measured and failure modes were observed through FE-SEM. Two-way ANOVA and the Tukey’s HSD test were performed to determine the effects of surface treatment method and type of cement on bond strength (P<.05). To confirm the correlationof surface treatment and failure mode, the Chi-square test was used. RESULTS. Groups treated with the nanostructured alumina coating showed significantly higher shear bond strength compared to other groups treated with airborne particle abrasion or tribochemical silica coating. Clearfil SA Luting showed a significantly higher shear bond strength compared to RelyX ARC and RelyX Unicem. The cohesive failure mode was observed to be dominant in the groups treated with nano-structured alumina coating, while the adhesive failure mode was prevalent in the groups treated with either airborne particle abrasion or tribochemical silica coating. CONCLUSION. Nano-structured alumina coating is an effective zirconia surface treatment method for enhancing the bond strength between Y-TZP ceramic and various dual-cured resin cements.

Influence of nano-structured alumina coating on shear bond strength between Y-TZP ceramic and various dual-cured resin cements

Lee, Jung-Jin,Choi, Jung-Yun,Seo, Jae-Min The Korean Academy of Prosthodonitics 2017 The Journal of Advanced Prosthodontics Vol.9 No.2

PURPOSE. The purpose of this study was to evaluate the effect of nano-structured alumina surface coating on shear bond strength between Y-TZP ceramic and various dual-cured resin cements. MATERIALS AND METHODS. A total of 90 disk-shaped zirconia specimens (HASS CO., Gangneung, Korea) were divided into three groups by surface treatment method: (1) airborne particle abrasion, (2) tribochemicalsilica coating, and (3) nano-structured alumina coating. Each group was categorized into three subgroups of ten specimens and bonded with three different types of dual-cured resin cements. After thermocycling, shear bond strength was measured and failure modes were observed through FE-SEM. Two-way ANOVA and the Tukey's HSD test were performed to determine the effects of surface treatment method and type of cement on bond strength (P<.05). To confirm the correlation of surface treatment and failure mode, the Chi-square test was used. RESULTS. Groups treated with the nano-structured alumina coating showed significantly higher shear bond strength compared to other groups treated with airborne particle abrasion or tribochemical silica coating. Clearfil SA Luting showed a significantly higher shear bond strength compared to RelyX ARC and RelyX Unicem. The cohesive failure mode was observed to be dominant in the groups treated with nano-structured alumina coating, while the adhesive failure mode was prevalent in the groups treated with either airborne particle abrasion or tribochemical silica coating. CONCLUSION. Nano-structured alumina coating is an effective zirconia surface treatment method for enhancing the bond strength between Y-TZP ceramic and various dual-cured resin cements.

크롬탄화물 용사피막의 접착력 및 잔류응력측정에 관한 연구

김의현,김종영 대한용접접합학회 1996 대한용접·접합학회지 Vol.14 No.4

The plasma sprayed Cr$_{2}$C$_{2}$-NiCr coatings are widely used as wear-resistant and corrosion-resistant materials. The mechanical properties of the plasma sprayed Cr$_{2}$C$_{2}$-NiCr coatings were examined in this study. The distribution of the residual stress with the coating thickness was also examined by X-ray diffraction method. The pore in the coatings could be classified into two types ; one is the intrinsic pore originated from the spraying powder, the other is the extrinsic pore formed during spraying. During the tensile adhesion test, the fracture occurred at the interface of top coat and substrate or top coat and bond coat depending on the existence of bond coat. It was found that the compressive residual stress near the interface decreased with the increase of the top coat thickness. The tensile adhesion strength of the coating without bond coat was higher than that with bond coat, because the coating with bond coat has higher horizontal crack density near the interface between bond coat and top coat.

자가부식 프라이머 접착제의 적용방식이 법랑질의 결합강도에 미치는 영향

박재구,조권환,조영곤 大韓齒科保存學會 2008 Restorative Dentistry & Endodontics Vol.33 No.2

The purpose of this study was to evaluate the effect of passive or active application of primer and coat times of bond on the shear bond strength when a self-etching primer adhesive (Clearfil SE Bond) was applied to enamel surface. Crowns of sixteen human molars were selected. Buccal and lingual enamels of crowns were partially exposed and slabs of 1.2 mm thick were made. They were divided into one of four equal groups (n = 8). Group 1: passive application of Primer and 1 coat of Bond, Group 2: active application of Primer and 1 coat of Bond, Group 3: passive application of Primer and 2 coats of Bond, Group 4: active application of Primer and 2 coats of Bond. Clearfil AP-X was bonded to enamel suface of each group using Tygon tubes. The bonded specimens were subjected to microshear bond strength (uSBS) testing with a crosshead speed of 1 mm/min. The results of this study were as follows; 1. The uSBS of Group 1 was the lowest among groups and the uSBS of Group 4 was the highest. 2. There was not statistically significant interaction between enamel uSBS by application method of Primer and coat time of Bond (p > 0.05). 3. There was not statistically significant difference between enamel uSBS by passive and active application of Primer (p > 0.05). 4. There was statistically significant difference between enamel uSBS by one- and two-coat of Bond (p < 0.05). 이 연구는 Clearfil SE Bond를 거친 법랑질 표면에 적용할 때, 자가부식 프라이머의 적용방식 (능동적인 또는 수동적인)과 접착레진의 도포회수 (1회 또는 2회)가 법랑질의 결합강도에 미치는 영향을 알아보기 위하여 시행하였다. 16개의 발거된 대구치 치관의 협면이나 설면에서 법랑질 절편을 만들어 4개의 군으로 배정한 다음, 1군은 프라이머를 수동적으로 적용한 후 접착레진을 1회 도포하였고, 2군은 프라이머를 능동적으로 적용한 후 접착레진을 1회 도포하였고, 3군은 프라이머를 수동적으로 적용한 후 접착레진을 2회 도포하였고, 4군은 프라이머를 능동적으로 적용한 후 접착레진을 2회 도포하였다. 적용된 접착레진을 10초간 광조사한 후, 법랑질 표면에 2-3개의 Tygon tube를 위치시키고 Clearfil AP-X를 충전하고 40초간 광조사 하였다. Universal testing machine을 이용하여 법랑질 표면에서 복합레진이 파절될 까지 분당 1.0 mm의 cross-head speed로 전단하중을 가하고 통계적으로 분석하여 다음과 같은 결과를 얻었다. 거친 법랑질에 대한 Clearfil SE Bond의 미세전단 결합강도는 자가부식 프라이머의 적용방식 보다는 접착레진의 도포회수에 의해 증가할 수 있음을 알 수 있었다.