Study on particle impact angle in powder jet machining (Dental treatment by hydroxyapatite film coating)
Powder jet machining is one of blasting processes conducted under room temperature and atmospheric pressure. This process brings both deposition and removal process, and in this study, it refers to powder jet deposition (PJD) and abrasive jet machining (AJM). As an application of PJD, the authors ha...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2017-09-01
|
| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/83/856/83_17-00169/_pdf/-char/en |
| _version_ | 1798015164190031872 |
|---|---|
| author | Akihiko TOMIE Chieko KUJI Ryo AKATSUKA Keiichi SASAKI Keita SHIMADA Masayoshi MIZUTANI Tsunemoto KURIYAGAWA |
| author_facet | Akihiko TOMIE Chieko KUJI Ryo AKATSUKA Keiichi SASAKI Keita SHIMADA Masayoshi MIZUTANI Tsunemoto KURIYAGAWA |
| author_sort | Akihiko TOMIE |
| collection | DOAJ |
| description | Powder jet machining is one of blasting processes conducted under room temperature and atmospheric pressure. This process brings both deposition and removal process, and in this study, it refers to powder jet deposition (PJD) and abrasive jet machining (AJM). As an application of PJD, the authors have proposed an innovative dental treatment method with the hydroxyapatite (HA) fine particle. By this method, thick HA coating can be fabricated directly in the human oral cavity. In this study, the effect of the particle impact angle was investigated as a parameter that affects the machining phenomenon. The experiments showed that the machining phenomenon transited depending on the blasting angle. In the vertical blasting condition, PJD process was just observed. On the other hand, in the more acute blasting angle such as 45 deg. or 60 deg. both coating and removal process appeared at the same time and in the most acute angle of 30 deg. only removal process was detected. The TEM observations showed that the impact surface of the HA substrate deformed and the deformation depth increased as the blasting angle get more acute. The smoothed particle hydrodynamics (SPH) method was utilized for the analysis for the fracture behavior of the HA substrate. The result indicated that the decrease of the impact angle induced the increase of the strain and the temperature of the interface between the particle and the substrate. Thus it is concluded that the shear stress, which refers to the impact angle, induces the destruction of the substrate by the deformation and the brittle fracture due to the thermal stress. |
| first_indexed | 2024-04-11T15:29:13Z |
| format | Article |
| id | doaj.art-7d63cfeeb1124325a33b2714ab3d3320 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T15:29:13Z |
| publishDate | 2017-09-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-7d63cfeeb1124325a33b2714ab3d33202022-12-22T04:16:10ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612017-09-018385617-0016917-0016910.1299/transjsme.17-00169transjsmeStudy on particle impact angle in powder jet machining (Dental treatment by hydroxyapatite film coating)Akihiko TOMIE0Chieko KUJI1Ryo AKATSUKA2Keiichi SASAKI3Keita SHIMADA4Masayoshi MIZUTANI5Tsunemoto KURIYAGAWA6Graduate School of Engineering, Tohoku UniversityGraduate School of Engineering, Tohoku UniversityGraduate School of Dentistry, Tohoku UniversityGraduate School of Dentistry, Tohoku UniversityGraduate School of Engineering, Tohoku UniversityGraduate School of Engineering, Tohoku UniversityGraduate School of Biomedical Engineering, Tohoku UniversityPowder jet machining is one of blasting processes conducted under room temperature and atmospheric pressure. This process brings both deposition and removal process, and in this study, it refers to powder jet deposition (PJD) and abrasive jet machining (AJM). As an application of PJD, the authors have proposed an innovative dental treatment method with the hydroxyapatite (HA) fine particle. By this method, thick HA coating can be fabricated directly in the human oral cavity. In this study, the effect of the particle impact angle was investigated as a parameter that affects the machining phenomenon. The experiments showed that the machining phenomenon transited depending on the blasting angle. In the vertical blasting condition, PJD process was just observed. On the other hand, in the more acute blasting angle such as 45 deg. or 60 deg. both coating and removal process appeared at the same time and in the most acute angle of 30 deg. only removal process was detected. The TEM observations showed that the impact surface of the HA substrate deformed and the deformation depth increased as the blasting angle get more acute. The smoothed particle hydrodynamics (SPH) method was utilized for the analysis for the fracture behavior of the HA substrate. The result indicated that the decrease of the impact angle induced the increase of the strain and the temperature of the interface between the particle and the substrate. Thus it is concluded that the shear stress, which refers to the impact angle, induces the destruction of the substrate by the deformation and the brittle fracture due to the thermal stress.https://www.jstage.jst.go.jp/article/transjsme/83/856/83_17-00169/_pdf/-char/enpowder jet depositionhydroxyapatitedental treatmentimpact anglesmoothed particle hydrodynamics |
| spellingShingle | Akihiko TOMIE Chieko KUJI Ryo AKATSUKA Keiichi SASAKI Keita SHIMADA Masayoshi MIZUTANI Tsunemoto KURIYAGAWA Study on particle impact angle in powder jet machining (Dental treatment by hydroxyapatite film coating) Nihon Kikai Gakkai ronbunshu powder jet deposition hydroxyapatite dental treatment impact angle smoothed particle hydrodynamics |
| title | Study on particle impact angle in powder jet machining (Dental treatment by hydroxyapatite film coating) |
| title_full | Study on particle impact angle in powder jet machining (Dental treatment by hydroxyapatite film coating) |
| title_fullStr | Study on particle impact angle in powder jet machining (Dental treatment by hydroxyapatite film coating) |
| title_full_unstemmed | Study on particle impact angle in powder jet machining (Dental treatment by hydroxyapatite film coating) |
| title_short | Study on particle impact angle in powder jet machining (Dental treatment by hydroxyapatite film coating) |
| title_sort | study on particle impact angle in powder jet machining dental treatment by hydroxyapatite film coating |
| topic | powder jet deposition hydroxyapatite dental treatment impact angle smoothed particle hydrodynamics |
| url | https://www.jstage.jst.go.jp/article/transjsme/83/856/83_17-00169/_pdf/-char/en |
| work_keys_str_mv | AT akihikotomie studyonparticleimpactangleinpowderjetmachiningdentaltreatmentbyhydroxyapatitefilmcoating AT chiekokuji studyonparticleimpactangleinpowderjetmachiningdentaltreatmentbyhydroxyapatitefilmcoating AT ryoakatsuka studyonparticleimpactangleinpowderjetmachiningdentaltreatmentbyhydroxyapatitefilmcoating AT keiichisasaki studyonparticleimpactangleinpowderjetmachiningdentaltreatmentbyhydroxyapatitefilmcoating AT keitashimada studyonparticleimpactangleinpowderjetmachiningdentaltreatmentbyhydroxyapatitefilmcoating AT masayoshimizutani studyonparticleimpactangleinpowderjetmachiningdentaltreatmentbyhydroxyapatitefilmcoating AT tsunemotokuriyagawa studyonparticleimpactangleinpowderjetmachiningdentaltreatmentbyhydroxyapatitefilmcoating |