Abstract:
The invention relates to a method for producing hollow bodies having freely displaceable particles enclosed in the hollow body, wherein a) a gel-forming liquid in which the particles are suspended is brought into a cross-linking bath, b) the gel cores that form are isolated, c) the cores are coated with a composition comprising sinterable material and a binder, and d) the coated cores are subjected to a heat treatment wherein the gel and the binder are expunged and the sinterable material is sintered into a closed shell. The gel forming material is, for example, sodium alginate, and the cross-linking bath comprises calcium ions. The particles are selected, for example, from ZrO2, AI2O3, TiO2, and SiO2 or mixtures thereof. The sinterable material is, for example, a metal powder such as carbonyl iron powder.
Abstract:
Procedimiento para la producción de cuerpos de conformado sinterizados de metal porosos, en el que se esponjan partículas de polímero expansibles, en las que está disperso un polvo de metal sinterizable, hasta dar un cuerpo de conformado y se somete el cuerpo de conformado a un tratamiento térmico en el que se expulsa el polímero y se sinteriza el polvo de metal sinterizable hasta dar un cuerpo de conformado sinterizado de metal poroso.