presence of the ceramic and solid lubricant filler the coating would become very hard and would glaze with subsequent significantly decreased abradability coating glazing thus is limiting by facile particle ejection when rubbed by a compressor blade while acceptable erosion resistance is maintained by the addition of the ceramic material the solid lubricant and ceramic particles are uniformly dispersed throughout the deposited coating thus any material removal that occurs does not change coating properties of the remaining seal coatings of the invention prepared by thermal spraying the coating composition onto a substrate have an excellent combination of abradability and erosion resistance as a result of the coating properties including low coating cohesive strength low porosity low surface roughness and high thermal conductivity as a result the coatings can be effectively used in combination with titanium alloy blades without danger of titanium fire coating glazing or excessive blade wear overall engine efficiency is increased if it should be desired to increase porosity of the abradable seal a particulate polymer having a size range of 1 to 200 u03bcm can be blended with the three phase composition material in an amount of 1 to 30 wt of the composition prior to thermal spraying the fugitive polymer is vaporized burned out or leached to yield a porous and permeable coating a list of the polymers which can be used is in u s pat no 4 917 960 incorporated herein by reference the abradable seal of the invention will now be described with reference to the following non limitative example commercially available durabrade u2122 2313 powder produced by westaim ambeon having a particle size in the range of u2212 100 200 mesh was blended with 15 wt of hexagonal boron nitride lubricant having.