The invention provides a preparation method for a high-
toughness nanometer black porcelain material. The preparation method comprises the following steps: 1) adding granular solids of zirconia,
alumina and
titanium dioxide
whisker into absolute ethyl
alcohol, carrying out wet ball milling, then carrying out mixing with a
polyvinyl alcohol solution after
drying, adding
yttrium oxide and
lanthanum phosphate, successively carrying out uniform mixing,
drying and thermosetting molding at a high temperature under vacuum and
grinding an obtained nanometer black porcelain material into
powder; and 2) adding granular raw materials consisting of SiC and BN into absolute ethyl
alcohol, carrying out wet ball milling, then carrying out uniform mixing with the nanometer black porcelain material
powder after
drying, putting an obtained mixture into a
graphite die, placing the
graphite die in a
hot press furnace, carrying out secondary
sintering at a high temperature under vacuum and carrying out temperature maintenance so at to prepare the high-
toughness nanometer black porcelain material. The invention has the following advantages: the preparation method employs in situ synthesis,
yttrium oxide is added as a stabilizing agent, so particle refinement and decrease of
sintering temperature are realized; the preparation method is simple and easy to operate and has low cost; and the prepared nanometer black porcelain material has high
toughness and good
thermal shock resistance and can be used in a
solar heat collection plate in replacement of
metal.