The invention discloses an ultrahigh-burning-speed double-layer ignition sheet in the technical field of thermal batteries, and the ultrahigh-burning-speed double-layer ignition sheet is prepared by the following steps: step 1,
slurry preparation: using
distilled water to immerse loose
asbestos paper until the loose
asbestos paper is soft, then crushing the loose
asbestos paper, adding
zirconium powder, and uniformly mixing to obtain a
zirconium powder paper pulp solution; respectively adding
barium chloride and
potassium chromate into the
zirconium powder paper pulp solution in a stirring state to obtain a turbid liquid containing the loose asbestos, the zirconium powder and the
barium chromate, performing suction
filtration to obtain a mixture containing the
barium chromate, the zirconium powder and the loose asbestos, dispersing the mixture in an
adhesive, and uniformly stirring to obtain
slurry; wherein the
mass ratio of the loose asbestos to the
barium chloride to the zirconium powder to the
potassium chromate is (1-10): (35-45): (15-20): (25-35); and secondly, the
slurry prepared in the first step is sprayed on an ultra-high-burning-rate Al-Ni film,
drying is conducted for 1.5-2.5 h under the condition of 120-180 DEG C in
argon shielding gas, and the ultra-high-burning-rate double-layer ignition sheet is obtained. Compared with the prior art, the ultrahigh-burning-speed double-layer ignition sheet prepared by the invention is higher in burning speed.