Silicone PSA is an option for bonding to PTFE, however etched PTFE (EPTFE) is a better choice for adhesive bonding. The etching process modifies the surface to promote adhesion. Silicone Pressure Sensitive Adhesives like products 91022 (adhesive transfer tape) and 96042 (double coated tape) are designed for high temperature exposure and low surface energy bonding, including PTFE.
For Mica to steel, an acrylic adhesive like 468MP (200MP adhesive transfer tape) or 9472LE (300LSE adhesive transfer tape) are great options for evaluation.