| Popis: |
In this work, a practically important parameters of strength and chemical resistance of polyepoxide based on resin-analogue ED-20 with PEPA hardener, filled with microdispersed powders of Si, Zr, Cr, Nb, Ti, Mo carbides, have been studied. The microstructure of the composites is characterized by a relatively uniform dense distribution of filler agglomerates, which can be seen in the example of compositions with 50 wt% TiC and ZrC. The absence of a significant effect of carbides on the temperature ranges of oxidative degradation of composites was established. Swelling method established that filling can radically increase the resistance of composites to acetone organic solvents. At the same time, resistance in an acidic environment is noticeably reduced (for example, nitric acid). It was found that the introduction of 50 wt% carbide fillers gives a significant increase in the strength and modulus of elasticity during compression of the composites. There is also a decrease in shrinkage and an increase in adhesion to steel (with normal tearing). |
