Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate
In the paper, a research on effects of baking temperature on chromite sand base of moulding sands bonded with sodium silicate is presented. Pure chromite sand and its chromite-based moulding sand prepared with use of sodium silicate were subjected to heating within 100 to 1200 °C. After cooling-down...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Polish Academy of Sciences
2017-06-01
|
| Series: | Archives of Foundry Engineering |
| Subjects: | |
| Online Access: | http://www.degruyter.com/view/j/afe.2017.17.issue-2/afe-2017-0058/afe-2017-0058.xml?format=INT |
| _version_ | 1827843030186459136 |
|---|---|
| author | Stachowicz M. Kamiński M. Granat K. Pałyga Ł. |
| author_facet | Stachowicz M. Kamiński M. Granat K. Pałyga Ł. |
| author_sort | Stachowicz M. |
| collection | DOAJ |
| description | In the paper, a research on effects of baking temperature on chromite sand base of moulding sands bonded with sodium silicate is presented. Pure chromite sand and its chromite-based moulding sand prepared with use of sodium silicate were subjected to heating within 100 to 1200 °C. After cooling-down, changes of base grains under thermal action were determined. Chromite moulding sand was prepared with use of 0.5 wt% of domestic made, unmodified sodium silicate (water-glass) grade 145. After baking at elevated temperatures, creation of rough layer was observed on grain surfaces, of both pure chromite sand and that used as base of a moulding sand. Changes of sand grains were evaluated by scanning microscopy and EDS analyses. It was found that changes on grain surfaces are of laminar nature. The observed layer is composed of iron oxide (II) that is one of main structural components of chromite sand. In order to identify changes in internal structure of chromite sand grains, polished sections were prepared of moulding sand hardened with microwaves and baked at elevated temperatures. Microscopic observations revealed changes in grains structure in form of characteristically crystallised acicular particles with limited magnesium content, intersecting at various angles. EDS analysis showed that these particles are composed mostly of chromium oxide (III) and iron oxide (II). The temperature above that the a.m. changes are observed in both chromite-based moulding sand and in pure chromite sand. The observed phenomena were linked with hardness values and mass of this sand. |
| first_indexed | 2024-03-12T08:18:58Z |
| format | Article |
| id | doaj.art-8ba23966a3744df5aef7bd0408a6081a |
| institution | Directory Open Access Journal |
| issn | 2299-2944 |
| language | English |
| last_indexed | 2024-03-12T08:18:58Z |
| publishDate | 2017-06-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Foundry Engineering |
| spelling | doaj.art-8ba23966a3744df5aef7bd0408a6081a2023-09-02T18:39:20ZengPolish Academy of SciencesArchives of Foundry Engineering2299-29442017-06-011729510010.1515/afe-2017-0058afe-2017-0058Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium SilicateStachowicz M.0Kamiński M.1Granat K.2Pałyga Ł.3Department of Foundry Engineering, Plastics and Automation, Wroclaw University of Technology, ul. Smoluchowskiego 25, 50-372 Wrocław, PolandDepartment of Foundry Engineering, Plastics and Automation, Wroclaw University of Technology, ul. Smoluchowskiego 25, 50-372 Wrocław, PolandDepartment of Foundry Engineering, Plastics and Automation, Wroclaw University of Technology, ul. Smoluchowskiego 25, 50-372 Wrocław, PolandDepartment of Foundry Engineering, Plastics and Automation, Wroclaw University of Technology, ul. Smoluchowskiego 25, 50-372 Wrocław, PolandIn the paper, a research on effects of baking temperature on chromite sand base of moulding sands bonded with sodium silicate is presented. Pure chromite sand and its chromite-based moulding sand prepared with use of sodium silicate were subjected to heating within 100 to 1200 °C. After cooling-down, changes of base grains under thermal action were determined. Chromite moulding sand was prepared with use of 0.5 wt% of domestic made, unmodified sodium silicate (water-glass) grade 145. After baking at elevated temperatures, creation of rough layer was observed on grain surfaces, of both pure chromite sand and that used as base of a moulding sand. Changes of sand grains were evaluated by scanning microscopy and EDS analyses. It was found that changes on grain surfaces are of laminar nature. The observed layer is composed of iron oxide (II) that is one of main structural components of chromite sand. In order to identify changes in internal structure of chromite sand grains, polished sections were prepared of moulding sand hardened with microwaves and baked at elevated temperatures. Microscopic observations revealed changes in grains structure in form of characteristically crystallised acicular particles with limited magnesium content, intersecting at various angles. EDS analysis showed that these particles are composed mostly of chromium oxide (III) and iron oxide (II). The temperature above that the a.m. changes are observed in both chromite-based moulding sand and in pure chromite sand. The observed phenomena were linked with hardness values and mass of this sand.http://www.degruyter.com/view/j/afe.2017.17.issue-2/afe-2017-0058/afe-2017-0058.xml?format=INTFoundry engineeringChromite sandMoulding sandBaking temperatureSodium silicate |
| spellingShingle | Stachowicz M. Kamiński M. Granat K. Pałyga Ł. Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate Archives of Foundry Engineering Foundry engineering Chromite sand Moulding sand Baking temperature Sodium silicate |
| title | Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate |
| title_full | Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate |
| title_fullStr | Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate |
| title_full_unstemmed | Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate |
| title_short | Effect of Temperature on Chromite-Based Moulding Sands Bonded with Sodium Silicate |
| title_sort | effect of temperature on chromite based moulding sands bonded with sodium silicate |
| topic | Foundry engineering Chromite sand Moulding sand Baking temperature Sodium silicate |
| url | http://www.degruyter.com/view/j/afe.2017.17.issue-2/afe-2017-0058/afe-2017-0058.xml?format=INT |
| work_keys_str_mv | AT stachowiczm effectoftemperatureonchromitebasedmouldingsandsbondedwithsodiumsilicate AT kaminskim effectoftemperatureonchromitebasedmouldingsandsbondedwithsodiumsilicate AT granatk effectoftemperatureonchromitebasedmouldingsandsbondedwithsodiumsilicate AT pałygał effectoftemperatureonchromitebasedmouldingsandsbondedwithsodiumsilicate |