Housing assembly for rotary engine

A housing assembly for a rotary internal combustion engine, comprising:

• a rotor housing extending around an axis, the rotor housing having a peripheral inner face facing a rotor cavity, a first face at a first side and a second face at a second side opposite to the first side;
• a first side housing secured to the first side of the rotor housing, the first side housing defining a first inner side face facing the rotor cavity and the rotor housing, the first side housing including a side wall secured to the rotor housing and a side plate, a peripheral section of the side plate disposed between the side wall and the rotor housing;
• and
• a second side housing secured to the second side of the rotor housing, the second side housing defining a second inner side face facing the rotor cavity and the rotor housing, the rotor cavity bounded axially between the first side housing and the second side housing, one or more of the rotor housing, the first side housing, and the second side housing having:
• a main body made of a base material;
• and
• an external layer made of an external material, the base material and the external material being dissimilar to one another, a wear-resistance of the external material greater than that of the base material, the external layer defining at least a part of one or more of the first face of the rotor housing, the second face of the rotor housing, the peripheral inner face of the rotor housing, the first inner side face of the first side housing, and the second inner side face of the second side housing.