Although there are many differences between polysilazane and silicone resin, there are indeed intersections in some application fields. The following are some manifestations of their intersection in application fields:
Coatings field
In terms of high-temperature resistant coatings:
Silicone resin itself has good heat resistance, such as phenyl silicone resin, which can withstand high temperatures and is commonly used as a high-temperature protective coating for industrial equipment, automotive engine compartment components, etc. It can protect the substrate from thermal damage and maintain structural stability in a certain high-temperature environment.
Polysilazane can also be used to prepare high-temperature resistant coatings, especially in some applications with higher temperature requirements and more demanding environments, such as the coating of some components of aerospace engines. Polysilazane can be converted into ceramic materials after high-temperature treatment, and with the excellent properties of ceramics such as high temperature resistance and insulation, it can achieve effective protection in high-temperature environments. In relatively less extreme high-temperature protection scenarios, both can play a role, forming coatings with certain heat resistance to protect the substrate material.
In terms of corrosion-resistant coatings:
Silicone resin, due to its chemical stability, has a certain tolerance to common acids, bases, organic solvents, etc. After coating the surface of chemical equipment, pipelines, etc. with silicone resin coating, it can reduce the corrosion of the substrate by corrosive media, extend the service life of equipment, and play a role in corrosion prevention.
Polysilazane, due to its high reactivity and ability to be converted into ceramics, can also form corrosion-resistant coatings on the surfaces of metals and other materials. It is tightly bonded to the substrate through chemical bonding and other methods to resist corrosion from external chemical substances. Therefore, both have application opportunities in some industrial environments that require corrosion-resistant coatings.
Electronic and electrical field
In terms of insulation materials:
Silicone resin has always been a commonly used insulation material in the field of electronic appliances, with low dielectric constant, dielectric loss, and high breakdown voltage. It can be used for insulation paint of motor windings, packaging of electronic components, etc., to ensure the electrical safety of electrical equipment and prevent electrical faults such as leakage.
Polysilazane also has applications in this field, and the film formed by it also has good insulation properties. Its high reactivity can also better bond with the surface of electronic components. In some special electronic components that require high insulation and material bonding tightness, polysilazane can also play an insulation role similar to silicone resin, providing electrical insulation protection.
Aerospace field (some scenarios)
In terms of surface protection:
Silicone resin can be used in the aerospace field for wing coating, fuselage sealing, etc. It utilizes its weather resistance, flexibility, and other characteristics to protect the aircraft structure from external environmental influences, such as resisting high-altitude ultraviolet radiation, temperature changes, and airflow erosion, maintaining the good appearance and structure of the aircraft.
Polysilazane is more widely used in the aerospace industry, such as in the thermal components of engines, where it is converted into ceramic coatings at high temperatures to achieve thermal protection. However, in some non critical parts of aircraft, such as surface protective coatings on some fuselage surfaces, considering both cost and performance, both polysilazane and silicone resin may be selected to achieve certain protective and decorative effects.
In general, in the fields of high-temperature resistant coatings, corrosion-resistant coatings, electronic and electrical insulation, and surface protection in aerospace, there is a certain intersection of applications between polysilazane and silicone resin based on their respective performance characteristics. However, the specific selection often needs to be comprehensively considered based on various factors such as actual working conditions and costs.

Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150K. 
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.