| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 236697 | Powder Technology | 2013 | 6 Pages |
Aluminum nitride was found to be of great significance in advanced ceramics. A widely applicable semiconductor, AlN is also commonly known for its considerable heat conductivity, as high as 320 W/(m·K). The idea behind the studies was to use AlN dispersions as a heat transferring liquid in closed systems. Such a liquid heat-carrier should give a proper rheological response when under variable shear-temperature conditions. Contrary to other systems reported in literature, i.e. nanofluids [1–20], the systems presented consisted of AlN micropowder and some novel base liquids: poly(propylene glycols) with an average molecular weight of 425 and 2000. The optimal result was to produce dispersions which display Newtonian-like flow at increased temperature and shear rate, as well as a suitable AlN concentration with sustained time-stability. This compilation of research assumptions should result in intensified heat exchange capabilities of liquid transferring media made on the basis of aluminum nitride.
Graphical abstractAluminum nitride – poly(propylene glycol) dispersions were prepared in order to obtain potential heat-transferring fluids of proper rheological properties. It has been succeeded to obtain highly concentrated and mostly stable dispersions of micro-AlN powder in PPG 425 and PPG 2000. All of the suspensions have been shear-thinned and their viscosity have strongly depended on temperature.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Highly loaded AlN-PPG suspensions were successfully obtained. ► The systems prepared were of shear-thinning flow and high time-stability. ► Increased temperature and shear rate provided nearly Newtonian flow to the systems. ► AlN-PPG suspensions were valuated as promising ones in heat transfer technology.
