Piston ring and thermal spray coating used therein, and method for manufacturing thereof

A piston ring comprising a thermal spray coating at least on an outer peripheral surface, which is combined with a cylinder liner of cast iron having a tensile strength of 300 MPa or less, said thermal spray coating comprising chromium carbide particles having an average particle size of 5 μm or less, and a matrix metal composed of a Ni—Cr alloy or a Ni—Cr alloy and Ni, which has an average pore diameter of 10 μm or less and a porosity of 8% or less by volume.

A piston ring comprising a thermal spray coating at least on an outer peripheral surface, which is combined with a cylinder liner of cast iron having a tensile strength of 300 MPa or less, said thermal spray coating comprising a first phase having chromium carbide particles dispersed in a matrix metal composed of a Ni—Cr alloy or a Ni—Cr alloy and Ni, and a second phase composed of at least one metal selected from the group consisting of Fe, Mo, Ni, Co, Cr and Cu or an alloy containing said metal, said first phase existing more than said second phase.