The invention relates to the field of
precision casting, and particularly discloses a preparation method of a
ceramic core of an oversized blade of a heavy-duty gas
turbine, which comprises the following steps: preparing a
ceramic core material which comprises the following raw materials in percentage by weight: 55-60% of a matrix, 15-20% of a mineralizer, 3-5% of a pore forming agent, 5-10% of a modifier and 15-18% of a
plasticizer, and uniformly mixing; performing injection molding; carrying out box filling, carrying out water bath secondary shape correction before box filling, hanging the
ceramic core on a box filling tool, uniformly scattering a landfill material, and carrying out vibration tamping;
sintering: charging the
saggar filled with the ceramic core into a furnace and
sintering in sections; strengthening the ceramic core, and soaking the
sintered ceramic core in hexyl
silicate hydrolysate and an
epoxy resin diluted solution; depoling: loading the blade mold shell with the mold core into a depoling kettle body, and then filling alkali liquor into the depoling kettle body; according to the method,
batch production of the ceramic core of the oversized blade of the heavy-duty gas
turbine is achieved, it is guaranteed that the size and performance meet the requirements, the overall percent of pass reaches 90% or above, core breakage and core leakage are avoided in the
casting process of a
casting, and the wall thickness size meets the requirements of a design drawing.