Crucible for heat treating materials produced by powder metallurgy, comprising: - a support, - a bowl positioned on the support, - a layer made of a susceptor material positioned around the bowl, - a first wall positioned around the layer made of susceptor material, - a second wall positioned around the first wall, - a cap in contact with at least one of the two walls, characterized in that at least one of the two walls has at least one hole intended to allow air to pass through in order to cool the crucible.