Arc Sprayed Steel: Microstructure in Severe Substrate Features
The effect of severe substrate topography on the microstructure of thermally sprayed coatings has been relatively neglected, but is critical in controlling the performance of thick electric arc sprayed steel shells for rapid tooling applications. This paper shows how the spray angle and the atomizin...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
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2009
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| _version_ | 1797105139990921216 |
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| author | Newbery, A Grant, P |
| author_facet | Newbery, A Grant, P |
| author_sort | Newbery, A |
| collection | OXFORD |
| description | The effect of severe substrate topography on the microstructure of thermally sprayed coatings has been relatively neglected, but is critical in controlling the performance of thick electric arc sprayed steel shells for rapid tooling applications. This paper shows how the spray angle and the atomizing gas pressure control the distribution of porosity and oxide in steel sprayed in and around cylindrical holes of different diameter and depth. Droplet splashing and the secondary deposition of splash droplets caused systematic variations in microstructure. In particular, the origin of the phenomenon of "bridging," the premature closure of features, has been revealed by microstructural analysis and explained in terms of the trajectories of droplets. The filling of features with higher-quality material can be aided by using a low atomizing gas pressure, reducing the oxygen partial pressure of the surrounding atmosphere and careful selection of the spray angle. © ASM International 2009. |
| first_indexed | 2024-03-07T06:43:17Z |
| format | Journal article |
| id | oxford-uuid:fa05feec-8989-4165-b364-e2330e6ddf1e |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:43:17Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:fa05feec-8989-4165-b364-e2330e6ddf1e2022-03-27T13:02:25ZArc Sprayed Steel: Microstructure in Severe Substrate FeaturesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:fa05feec-8989-4165-b364-e2330e6ddf1eEnglishSymplectic Elements at Oxford2009Newbery, AGrant, PThe effect of severe substrate topography on the microstructure of thermally sprayed coatings has been relatively neglected, but is critical in controlling the performance of thick electric arc sprayed steel shells for rapid tooling applications. This paper shows how the spray angle and the atomizing gas pressure control the distribution of porosity and oxide in steel sprayed in and around cylindrical holes of different diameter and depth. Droplet splashing and the secondary deposition of splash droplets caused systematic variations in microstructure. In particular, the origin of the phenomenon of "bridging," the premature closure of features, has been revealed by microstructural analysis and explained in terms of the trajectories of droplets. The filling of features with higher-quality material can be aided by using a low atomizing gas pressure, reducing the oxygen partial pressure of the surrounding atmosphere and careful selection of the spray angle. © ASM International 2009. |
| spellingShingle | Newbery, A Grant, P Arc Sprayed Steel: Microstructure in Severe Substrate Features |
| title | Arc Sprayed Steel: Microstructure in Severe Substrate Features |
| title_full | Arc Sprayed Steel: Microstructure in Severe Substrate Features |
| title_fullStr | Arc Sprayed Steel: Microstructure in Severe Substrate Features |
| title_full_unstemmed | Arc Sprayed Steel: Microstructure in Severe Substrate Features |
| title_short | Arc Sprayed Steel: Microstructure in Severe Substrate Features |
| title_sort | arc sprayed steel microstructure in severe substrate features |
| work_keys_str_mv | AT newberya arcsprayedsteelmicrostructureinseveresubstratefeatures AT grantp arcsprayedsteelmicrostructureinseveresubstratefeatures |