Machined BN components

HiWe are a company based out of Australia. We would like to source machined BN components of the grade CABN. Open to other suggestions on the binder.The approximate outer dimensions of the component is 300mm diameter and 300mm length. Quantity: We require 30 Pieces.Note:Operating in Inert ConditionsOperating temperature 1800CMaximum thermal expansion 2 x 10-6/K between 25C-1800CMinimum acceptable thermal conductivity is 25 w/m/k between 25C-1800C