Technical Article Continued from p21

AdBond® QuikSet™ Technology Polymer technology, once developed over 30 years ago, has remained quite static, with some developments in cost and loading percent to maximise economy. However, in recent years, REMET has developed a polymer which is a developmental leap in polymer technology. AdBond® QuikSet™ is a novel polymer which has been designed to enhance drying beyond conventional polymer systems. REMET have presented literature worldwide on this material in various forums [1,2]. We applied the same methodology to this slurry also and found some very interesting results. Firstly, as presented in many papers,

the strength of the QuikSet polymer is higher than a standard polymer enhanced slurry. This is good news as it reduces even further the possibility of de-wax cracking within the system. Now, let’s look at the drying

effectiveness of the material. This is of course the main benefit of this novel material. As presented in other literature [1,2], we believe the water can “wick” out of the ceramic and improve drying effectiveness compared to other polymer systems. Figure 8 shows the strength development of the system versus a 4-hour benchmark. As can be seen, the strength

development occurs by the time 1-hour intercoat dry time is reached. So, not only can AdBond® QuikSet™ make a stronger green shell, it can do it quicker than a traditional polymer enhanced system. If we compared this result to the standard polymer enhanced slurry, it can be seen after 1 hour, shells are 11 % stronger and drier. Finally, we attempted to establish

a trendline of strength development for the QuikSet slurry be decreasing the dry time to less than 1 hour. While there exists the same trendline

at short dry times, even at these short dry times, the strength is always stronger than a standard polymer enhanced slurry.

22 ❘ November 2020 ®

Figure 6: Percentage change in strength of polymer enhanced shell system versus a 4-hour control

Figure 4: No polymer versus polymer enhanced shell systems (4-hour dry time)

Figure 5: MOR results of a polymer enhanced shell system versus intercoat dry time

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