Looking for complete solution of Ceramic plates for sintering furnaces

Dear Sir, I have two MIM sintering furnaces. Smaller furnace is for Lab/small batch production of MIM parts. Chamber size is 12\\\"x12\\\"x16\\\" and can accommodate 10\\\"x14\\\" ceramic plates(bats).
We are using Silicon Carbide plates with thin Al2O3 plates on top right now. Thin Al2O3 plates are 7\\\"x10\\\". The plates were imported from Germany and are quite expensive. Max temperature is 1400 deg C. Nitrogen, Hydrogen and vacuum may be our atmosphere. Pease suggest complete solution along with material specs and prices and min order size.
My second furnace is of vertical design.14\\\" dia round trays with a 1.5\\\" hole at center are stacked using small pillars. Stack height may go upto 30\\\". Furnace has carbon/graphite heating electrodes. It is used for sintering of MIM parts of SS and several other steel alloys.
Please suggest complete solution for the sintering ceramic support/bats/pillars etc. along with material spec., prices, minimum order etc. Atmosphere : vacuum, Hydrogen, Nitrogen, Organ etc. Max. Temp: 1400 deg C.
With best wishes and regards