The technique character of the baffle of inspirator was introduced.A feasible process plan was determined and the integral piercing blanking bending forming die was designed.
The dependences of seepage velocity and bending strength on agglomerant content, forming pressure, particle diameter of the aggregate, soaking time, firing temperature and so on were discussed.
Heat treatment and pre-strain, tensile test of the material and four point bending test have been carried to obtain the mechanical property of the undegraded and degraded material at low temperature.