Patent ID: 8105533

Claim:
An apparatus for exposing a test piece to a corrosive gas which, during use, allows an atmosphere gas to be continuously fed into a test-piece-placing section for accommodating a material test piece, the atmosphere gas having a predetermined composition and having been heated to a predetermined temperature, wherein the apparatus comprises a gas inlet, a gas-heating section, a flow-limiting section for gradually reducing a cross-sectional area of a gas flow path, a test-piece-placing section, a gas outlet, and a heating furnace, the gas-heating section being situated along the gas flow path between the gas inlet and the flow-limiting section, the flow-limiting section being situated along the gas flow path between the gas-heating section and the test-piece-placing section, and the test-piece-placing section being situated along the gas flow path between the flow-limiting section and the gas outlet, the gas-heating section, the flow-limiting section and the test-piece-placing section are included in a one-piece ceramic-made tube and the one-piece ceramic made tube is arranged in the heating furnace, and the cross-sectional area of the gas-heating section through which the gas flows is larger than that of the test-piece-placing section.