Properties of thermoplastic slips from titanium and aluminum nitride powders produced by the plasma-chemical process and self-propagating high-temperature synthesis

Abstract

1. In a study of some properties of slips from plasma-chemical and SHS titanium and aluminum nitride powders and their mixtures it proved impossible to obtain high-density thermoplastic slips from the plasmachemical powders. High density was exhibited by slips from the SHS powders and mixtures of the two powders containing not more than 10% of a plasma-chemical powder. 2. Because of their chemical reaction with the binder, the plasma-chemical A1N powders proved unsuitable for the preparation of thermoplastic slips. The maximum coefficient of packing of slips with the plasma-chemical TiN powders was 0.37. 3. For the A1N slips the best fluidizing properties were found to be exhibited by binders of compositions 90% paraffin wax+10% beeswax and 90% paraffin wax+ 7.5% beeswax+ 2.5% oleic acid and for the TiN slips by a binder of composition 80% paraffin wax+20% beeswax. 4. Castings of comparatively high density can be produced from thermoplastic slips from SHS TiN and A1N powders. In the work described above A1N and TiN slips had coefficients of packing of 0.8 and 0.72, respectively, at a viscosity of 10 N-sec/m2 (100 P). 5. The density of slips from mixtures of the SHS and plasma-chemical (10%) powders was 3.45 g/cm3, which corresponded to a coefficient of packing of 0.65.