کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5457757 1515952 2017 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Application of compression lubricant as final porosity controller in the sintering of tungsten powders
ترجمه فارسی عنوان
استفاده از روان کننده فشرده سازی به عنوان کنترل کننده تخلخل نهایی در پخت پودر تنگستن
کلمات کلیدی
روان کننده، تنگستن نفوذی پوسته پوسته،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
چکیده انگلیسی
Sintering behavior of two tungsten powders (1.2 μm and 6 μm) was studied for preparing infiltrable porous skeleton. Both powders were compressed by mechanical press (MP) and cold isostatic press (CIP) with and without stearic acid respectively as compaction lubricant. Results showed that presence of solid lubricant powder in addition of its essential effect on soundness of parts, depending on its size and distribution, could mainly affect sintered microstructure. Stearic acid as compaction lubricant in addition of decreasing friction between particles during the compaction, has acted as spacing particles between primary powder particles. In the cases that lubricant particles are much bigger than tungsten particles a big pore remained after evaporation of lubricant. During the sintering, big pores became bigger due to coarsening mechanism and formed an interconnected network of pores and on the other hand small pores shrank or even disappeared due to densification. By exact controlling of the size of tungsten powder and lubricant powder, infiltrable tungsten skeletons with 80% of theoretical density were produced successfully at low sintering temperatures such as 1500 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Refractory Metals and Hard Materials - Volume 66, August 2017, Pages 21-25
نویسندگان
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