Abstract
In this fundamental work, a series of experiments were performed to define the optimal amount of dispersant and solid content for feedstock with and without ceramic fibers (Nextel 610). Based on these fixed conditions, investigations were carried out to discover the effects of binder system, fiber sizing, and increasing fiber content on mixing and viscosity. In addition, the effects of kneading temperature and time, fiber sizing, and different binder systems on fiber length were investigated using a measuring mixer, high-pressure capillary rheometer, and microscopy. Stearic acid, as a dispersant, modified the particle surface and improved the rheological properties. Moreover, increasing the solid content in the feedstocks led to an exponential growth of final torque and relative viscosity, because of the increasing friction between particles. Paraffin wax (PW)- and polyethylene glycol (PEG)-based feedstocks showed different mixing behaviors and rheological results with increasing fiber, whereas PEG-based feedstocks had higher final torques and kneading energies without fibers, whilst PEG feedstocks displayed lower viscosities. Consequently, during kneading, the amount of fiber has been predominating over fiber length, and the effect of the binder, the kneading temperature, and time did not cause significant changes.
Highlights
Ceramics are used in almost all industrial areas because of their high hardness, good corrosion and erosion resistance, and excellent high-temperature stability
We composed the main binding system based on paraffin wax (PW) “Sasolwax® 6403” from Sasol Performance Chemicals, Hamburg, Germany, that ensures the flowability of the feedstock
A series of feedstocks were prepared at constant stearic acid, 3.3 mg·m−2, and solid content, 50 vol %, by varying the fiber content, kneading time and temperature, and binding system
Summary
Ceramics are used in almost all industrial areas because of their high hardness, good corrosion and erosion resistance, and excellent high-temperature stability. After mixing of the solid and binder components, injection molding takes place in the desired forms, and the green parts should be debinded and sintered. Another special variant of the injection molding process is for the short fiber-reinforced plastic comAportnicelne ts, and has become a widely used process in industry because of the variety of matrix/fiber cinotmerIbenisnt abvtyieosnesvstetirhagaltraepstreioaovricdnheertosatifoloirFnevdeespetridgoapsteetrttohieecsdkfioffrePerearnceht tpdypeaseisrroeadf tmpiarootednruiaclfts.,ofiTrbheerIroenrhijeaenstcabtetieoinnosi,nnacnrdeatshineigr effecMts oon lthde ipnrogperotiefs [O8,1x0–i1d8]e. Process. 2019, 3, 9 was to develop sustainable, highly fiber-filled feedstocks based on our previous experiences with powder injection molding
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