The invention provides a preparation method of a
potassium-containing round-
tungsten-doped aluminum strip, comprising the following steps of: carrying out
material selection of
ammonium paratungstate, carrying out
light hydrogen reduction on the
ammonium paratungstate, carrying out AKS (Adjacent Key Suppression)
doping, directly reducing, carrying out
acid washing, preparing
powder, carrying out cold isostatic compaction, pre-
sintering, vertically
smelting and the like. According to the invention,
ammonium paratungstate with a special Fisher
granularity is selected to carry out the
light hydrogen reduction; and after the
doping, a special process is used for directly reduction to obtain rough and fine
tungsten-doped
powder. Meanwhile, mixed
tungsten powder which is good in normal distribution and simultaneously avoids a peak-shaped or double-peak phenomenon is obtained according to a reasonable rough and
fine powder proportion; the tungsten powder is pressed into a tungsten blank strip; the tungsten blank strip is pre-sintered to form a tungsten strip which is primarily and vertically smelted at a high temperature; and the quantity of particles on the section of the tungsten strip is increased according to a
potassium foam forming mechanism and the partial growth of
crystal grains is avoided, so that the aims of small
potassium foam hole
diameter, large density, a plurality of
crystal interfaces, long potassium foam row and uniform distribution are achieved. A
tungsten filament for a
halogen tungsten lamp, which is obtained by
machining the obtained tungsten strip through a pressure, is re-crystallized to obtain a dovetail overlap joint structure with a good tissue; and the length /
width ratio of the potassium foam is great and the high-temperature anti-drooping performance is good.