Study on the Sintered Characteristics and Properties of Co-30 mass% Cr Alloys under Various Vacuum Hot-Press Sintering Temperatures and Pressures
In this research, Co-30 mass% Cr alloys were fabricated by a vacuum hot-press sintering process. Different amounts of submicron cobalt and chromium (the mean grain size is 800 and 700 nm, respectively) powders were mixed by ball milling. Furthermore, this study imposed various hot-press sintering te...
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| Format: | Article |
| Language: | English |
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Polish Academy of Sciences
2020-03-01
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| Series: | Archives of Metallurgy and Materials |
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| Online Access: | https://journals.pan.pl/Content/115073/PDF/AMM-2020-1-49-Chang.pdf |
| _version_ | 1811220314101645312 |
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| author | Shih-Hsien Chang Chih-Yao Chang Kuo-Tsung Huang |
| author_facet | Shih-Hsien Chang Chih-Yao Chang Kuo-Tsung Huang |
| author_sort | Shih-Hsien Chang |
| collection | DOAJ |
| description | In this research, Co-30 mass% Cr alloys were fabricated by a vacuum hot-press sintering process. Different amounts of submicron cobalt and chromium (the mean grain size is 800 and 700 nm, respectively) powders were mixed by ball milling. Furthermore, this study imposed various hot-press sintering temperatures (1100, 1150, 1200 and 1250°C) and pressures (20, 35 and 50 MPa), while maintaining the sintering time at 1 h, respectively. The experimental results show that the optimum parameters of hot-press sintered Co-30 mass% Cr alloys are 1150°C at 35 MPa for 1 h. Meanwhile, the sintered density reaches 7.92 g·cm–3, the closed porosity decreases to 0.46%, and the hardness and transverse rupture strength (TRS) values increase to 77.2 HRA and 997.1 MPa, respectively. While the hot-press sintered Co-30 mass% Cr alloys at 1150°C and 20 MPa for 1 h, the electrical conductivity was slightly enhanced to 1.79 × 104 S·cm–1, and the phase transformation (FCC → HCP) of cobalt displayed a slight effect on sintering behaviors of Co-30 mass% Cr alloys. All these results confirm that the mechanical and electrical properties of Co-30 mass% Cr alloys are effectively improved by using the hot-press sintering technique. |
| first_indexed | 2024-04-12T07:39:35Z |
| format | Article |
| id | doaj.art-f922def40c9a458da3f8e36bb56d6d7a |
| institution | Directory Open Access Journal |
| issn | 2300-1909 |
| language | English |
| last_indexed | 2024-04-12T07:39:35Z |
| publishDate | 2020-03-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Metallurgy and Materials |
| spelling | doaj.art-f922def40c9a458da3f8e36bb56d6d7a2022-12-22T03:41:51ZengPolish Academy of SciencesArchives of Metallurgy and Materials2300-19092020-03-01vol. 65No 1393402https://doi.org/10.24425/amm.2020.131742Study on the Sintered Characteristics and Properties of Co-30 mass% Cr Alloys under Various Vacuum Hot-Press Sintering Temperatures and PressuresShih-Hsien ChangChih-Yao ChangKuo-Tsung HuangIn this research, Co-30 mass% Cr alloys were fabricated by a vacuum hot-press sintering process. Different amounts of submicron cobalt and chromium (the mean grain size is 800 and 700 nm, respectively) powders were mixed by ball milling. Furthermore, this study imposed various hot-press sintering temperatures (1100, 1150, 1200 and 1250°C) and pressures (20, 35 and 50 MPa), while maintaining the sintering time at 1 h, respectively. The experimental results show that the optimum parameters of hot-press sintered Co-30 mass% Cr alloys are 1150°C at 35 MPa for 1 h. Meanwhile, the sintered density reaches 7.92 g·cm–3, the closed porosity decreases to 0.46%, and the hardness and transverse rupture strength (TRS) values increase to 77.2 HRA and 997.1 MPa, respectively. While the hot-press sintered Co-30 mass% Cr alloys at 1150°C and 20 MPa for 1 h, the electrical conductivity was slightly enhanced to 1.79 × 104 S·cm–1, and the phase transformation (FCC → HCP) of cobalt displayed a slight effect on sintering behaviors of Co-30 mass% Cr alloys. All these results confirm that the mechanical and electrical properties of Co-30 mass% Cr alloys are effectively improved by using the hot-press sintering technique.https://journals.pan.pl/Content/115073/PDF/AMM-2020-1-49-Chang.pdfco-30 mass% cr alloyshot-press sinteringhardnesstrs and electrical conductivity |
| spellingShingle | Shih-Hsien Chang Chih-Yao Chang Kuo-Tsung Huang Study on the Sintered Characteristics and Properties of Co-30 mass% Cr Alloys under Various Vacuum Hot-Press Sintering Temperatures and Pressures Archives of Metallurgy and Materials co-30 mass% cr alloys hot-press sintering hardness trs and electrical conductivity |
| title | Study on the Sintered Characteristics and Properties of Co-30 mass% Cr Alloys under Various Vacuum Hot-Press Sintering Temperatures and Pressures |
| title_full | Study on the Sintered Characteristics and Properties of Co-30 mass% Cr Alloys under Various Vacuum Hot-Press Sintering Temperatures and Pressures |
| title_fullStr | Study on the Sintered Characteristics and Properties of Co-30 mass% Cr Alloys under Various Vacuum Hot-Press Sintering Temperatures and Pressures |
| title_full_unstemmed | Study on the Sintered Characteristics and Properties of Co-30 mass% Cr Alloys under Various Vacuum Hot-Press Sintering Temperatures and Pressures |
| title_short | Study on the Sintered Characteristics and Properties of Co-30 mass% Cr Alloys under Various Vacuum Hot-Press Sintering Temperatures and Pressures |
| title_sort | study on the sintered characteristics and properties of co 30 mass cr alloys under various vacuum hot press sintering temperatures and pressures |
| topic | co-30 mass% cr alloys hot-press sintering hardness trs and electrical conductivity |
| url | https://journals.pan.pl/Content/115073/PDF/AMM-2020-1-49-Chang.pdf |
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