مروری بر عوامل تاثیرگذار بر رفتار جریان مواد مرکب بسیار پرشده
محورهای موضوعی : پليمرها و نانوفناوری
1 - دانشگاه تهران
کلید واژه: مواد مرکب بسیار پرشده, رفتار رئولوژیکی , رفتار جریان, رفتار شبه پلاستیک, گرانروی,
چکیده مقاله :
مواد مرکب بسیار پرشده از دو جزء ماتریس پلیمری و پرکننده‌های مختلف با کسر وزنی بیشتر از %30 تشکیل شده است و کاربرد فراوانی در سامانه های دفاعی و موتورهای هوا فضایی دارند. هریک از پودرهای فلزی باتوجه به خواص، نوع دانه‌بندی، نوع اندازه ذرات، مورفولوژی می‌توانند بر رفتار جریان ماده مرکب بسیار پرشده تاثیرگذار باشند. بررسی سه نوع پودر فلزی، آلومینیوم، منیزیم و بور که بیشترین کاربرد را در ماده مرکب بسیار پرشده دارند، در این مطالعه انجام شده است. نتایج حاصل از بررسی رفتار جریان نشان داد که با افزایش اندازه ذرات جامد، محتوای پودرهای فلزی و هم چنین عامل شبکه کننده، گرانروی و تنش تسلیم دوغاب مواد مرکب افزایش می یابد و موجب می شود که خواص جریان یافتن دوغاب بدتر گردد و عمرکاربری آن کوتاه¬تر شود. افزایش گرانروی به علت ذرات جامد ریزتر و افزایش وزن مولکولی و تشکیل اتصالات عرضی در ساختار پیش‌پلیمر می‌باشد. گرانروی دوغاب مواد مرکب با افزایش سرعت برشی کاهش می یابد و رفتارغیرنیوتنی شبه پلاستیک را از خود نشان می¬دهد و مقدار آن به سرعت و زمان نیروی برشی اعمال‌شده بستگی دارد. ترکیب پودر فلزی بور با پودر منیزیم و یا آلومینیوم می¬تواند تا حد زیادی رفتار جریان ماده مرکب بسیار پر شده را بهبود بخشد.
The highly filled composite consists of two polymer matrix components and different fillers with a weight fraction of more than 30% and are widely used in defense systems and aerospace engines. Each of the metal powders can affect the rheological behavior of highly filled composites according to their properties, type of granulation, type of particle size, and morphology. The investigation of three types of metal powders, aluminum, magnesium and boron, which are the most used in highly filled composites, has been done in this study. The results of the investigation of the rheological behavior showed that with the increase in the size of solid particles, the content of metal powders, as well as the cross-linking factor, the viscosity and yield stress of the slurry of composite materials increases and causes the flow properties of the slurry to deteriorate and its service life to be shortened. become wet The increase in viscosity is due to smaller solid particles and the increase in molecular weight and the formation of transverse connections in the structure of the prepolymer. The viscosity of the slurry of composite materials decreases with the increase of the shearing speed and shows non-Newtonian pseudo-plastic behavior, and its value depends on the speed and time of the applied shearing force. Combining boron metal powder with magnesium or aluminum powder can greatly improve the rheological behavior of the highly filled composite.
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