Pressure casting slip and refractory ceramic produced therefrom for gas turbine units

A pressure casting slip for producing a refractory ceramic for use as a heat shield in a hot gas path comprising:

• a particulate mix of at least two materials having different coefficients of thermal expansion and xanthan as an organic binder and floating agent, wherein
• the particulate mix has a multimodal particle size weight distribution of
• 10-20 percent by weight of coarse particles in the diameter range 1-5 mm,
• 10-20 percent by weight of medium particles in the diameter range 0.5-1 mm and
• 60-80 percent by weight of fine particles in the diameter range up to 0.5 mm,
• proportions of the weight distribution are selected so that the weight distribution of the particles add up to 100 percent by weight of the particulate mix, and
• the medium particles comprise at least 20 percent by weight of the material having a smaller coefficient of thermal expansion.