THE EFFECTIVE VISCOSITY OF TRIBOLOGICAL COMPOSITE MATERIAL ULTRAN 630CF

Abstract

The main methods of forming polymer composite materials based on thermoplastic matrices are injection molding and extrusion. All of them realize the process of viscous flow, in which an internal friction force occurs, characterized by the melt viscosity. This parameter determines the method of processing the material into a product. (Research purpose) The research purpose is to determine the value of the effective viscosity of a composite tribotechnical material ULTRAN 630CF based on polyamide, depending on the temperature and the applied force. (Materials and methods) The samples were granules of ULTRAN 630CF. The rheological properties of ULTRAN 630CF were measured using an extrusion plastometer PTR-LAB-02. The experiment consisted in evaluating the effective viscosity of the material with varying temperatures and operating loads. The heating temperatures of the samples were 250, 270 and 290 degrees Celsius. During the measurements, the melt shear rate varied by installing loads of various weights: 3.8; 5; 7 kilograms. (Results and discussion) Based on the data obtained experimentally, the article presents the calculated viscosity value and a graphical interpretation. With increasing temperatures and loads, the viscosity of the material drops to 6.1 times. The influence of the load value is noticeable only at a temperature of 250 degrees Celsius, which is associated with a viscosity anomaly. At temperatures of 270 and 290 degrees Celsius, the shear stresses are small, the material flows with a constant viscosity. (Conclusions) The viscosity of ULTRAN 630CF decreases linearly with increasing temperatures and loads, which indicates its high stability and a wide range of processing methods: extrusion, injection molding, pressing, 3D printing.