When the titanium tube is formed, the influence factors of the process parameters on the porous material are particle size, particle size composition, pressure and the like. If a porous material having a large pore size and high gas permeability is to be obtained, a powder having a large particle size should be used, and vice versa. The porous material should preferably be a powder having a narrow particle size distribution because of the arch bridge effect, which increases the porosity. Porous materials such as spherical powders are advantageous for improving permeability. The process parameter pressure has a great influence on the forming. As the forming pressure increases, the porosity and permeability of the article decrease.
When the titanium tube is formed, the influence factors of the process parameters on the dense material are particle size, particle size composition, pressure and the like. In contrast to the porous material, the preparation process uses a mixed powder, that is, a powder having a wide particle size distribution is preferably pressed, and a powder having a particle size of less than 150 um (100 mesh) is often used. Such fine powder particles are easily pressed into the coarse pores, and the compacts are compact and have a large density when pressed. If the surface of the powder particles is uneven and polygonal, it is advantageous for pressing. Pressure has an effect on the formation, but the impact is not very significant. As the pressure increases, it is advantageous to increase the compactness of the product and reduce the porosity of the product.
Titanium tube sintering is the process of forming a dense or porous article by metallurgical bonding of a loose powder or compact at elevated temperatures. Sintering causes the powder particles to achieve a strong bond and alloy the mixed powder. Usually the sintering temperature is lower than the melting point of the main component.
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