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=== Copper–Tungsten Materials===
Copper–tungsten materials with typically 50-85 wt% tungsten are produced by the infiltration process with the tungsten particle size selected according to the end application [[#figures4|(Figs. 5 – 86)]] <!--(Figs. 2.138 – 2.141)--> and (<xr id="tab:Physical properties of copper-tungsten materials"/><!--(Table 2.39)-->). To increase the wettability of the tungsten skeleton by copper a small amount of nickel < 1 wt% is added to the starting powder mix.
<figtable id="tab:Physical properties of copper-tungsten materials">
<div class="multiple-images">
<figure id="fig:Micro structure of W Cu 70 30 G">
[[File:Micro structure of W Cu 70 30 G.jpg|left|thumb|<caption>Micro structure of W/Cu 70/30 G(coarse)</caption>]]
</figure>
<figure id="fig:Micro structure of W Cu 70 30 F">
[[File:Micro structure of W Cu 70 30 F.jpg|left|thumb|<caption>Micro structure of W/Cu 70/30 F(fine)</caption>]]
</figure>
