According to the content of Li, the dry materials were mixed with [Li.sub.2]C[O.sub.3], and the presintering
temperature is 920[degrees]C in 4 hours.
The presintering experimental design is shown in Table 4, and the results of the presintering experiment are shown in Table 5.
According to the results of the presintering experiment, the preheating temperature can be set in the range of 200~450[degrees]C, and the preheating time is preferably in the range of 10~20 min.
According to the results of the presintering experiment, three preheating time periods (10 min, 15 min, and 20 min) were selected to investigate the effect of the preheating method on ceramsite properties.
In the presintering process, the copper tube was heated in a heating chamber to around 500[degrees]C (932[degrees]F) for about 1 h.
Sintering was done by keeping the entire sample (prepared in the presintering process) in the sintering furnace at a temperature of about 1050[degrees]C (1922[degrees]F) for about 4 h.
The extruded rods had no shrinkage after presintering
at 1100[degrees]C, which means that their strength resulted only from the neck formation between particles during the initial stage of sintering and from the surface quality of the extruded segments .
They are prepared by presintering
at tem- peratures below 1500C to reach a density of atleast
The shapes of particles were traced back, following each step of preparation (Figure 2(a) for mixture, Figure 2(b) for presintering
product, and Figure 2(c) for sintered product).
Sample prepared after using recrushed powders from presintering
gives significant improved properties and good biocompatibility.
During the presintering
stage, the polymer in the composite is degraded, and as a result of this degradation, small amounts of carbon residue are left behind.
is very critical for the correct consolidation of carbide and cobalt.