Method of sintering electrically conducting powders and an apparatus for carrying out said method
A technology of conductive powder and sintering current, applied in the field of obtaining sintered parts, can solve the problem of impossible to obtain large samples, and achieve the effect of optimizing processing time and optimizing energy consumption
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example 1
[0093] Example 1: WC-6Co / WC-10Co
[0094] WC-6Co or WC-10Co sheets with a thickness of 16 mm and a diameter of 22 mm were fabricated using the disclosed equipment. Agglomerated powders are spherical in shape with a particle size of less than 100 microns.
[0095] During the activation step, apply at 2kA / cm during 100ms to 200ms 2 up to 4kA / cm 2 Between the current density to activate the powder. This activation step requires a voltage between 15V and 50V.
[0096] In the subsequent sintering stage, 6kA / cm 2 up to 10kA / cm 2 Between current densities to obtain dense samples at voltages less than 10V. Between the activation phase and the sintering phase, a minimum time of 10 ms was established. A pressure of 100 MPa to 500 MPa is applied from the beginning of the process.
[0097] The final tablet has a density of about 13 g / cm as measured by the Archimedes method 3 to 14.8g / cm 3 . Fully dense samples can be obtained with a hardness of about 1800 HV30 to 2100 HV30. ...
example 2
[0099]Titanium sheets with a thickness of 10 mm and a diameter of 22 mm were produced using the disclosed apparatus. The powder particles were irregular in shape with a maximum particle size of about 75 microns.
[0100] During the activation step, apply at 1kA / cm during 90ms to 100ms 2 up to 3kA / cm 2 Between the current density to activate the powder. The activation phase requires a voltage between 10V and 50V.
[0101] During the sintering phase, 4kA / cm was applied during 500ms to 1000ms 2 up to 7kA / cm 2 Between current densities to obtain dense samples at voltages less than 10V. Between these activation phases and the sintering phase, a minimum time of 10 ms was established. A pressure of 100 MPa to 500 MPa is applied from the beginning of the process.
[0102] The final tablet has a density of about 3.5 g / cm as measured by the Archimedes method 3 to 4.4g / cm 3 . Fully dense samples can be obtained.
example 3
[0103] Example 3: TiC-25Ni and TiC-25Fe
[0104] TiC-25Ni and TiC-25Fe sheets with a thickness of 16 mm and a diameter of 22 mm were fabricated using the disclosed equipment. Agglomerated powders are irregular in which the particle size is less than 30 microns.
[0105] During the activation step, apply at 1kA / cm during 100ms to 200ms 2 up to 3kA / cm 2 Between the current density to activate the powder. This activation phase requires a voltage between 15V and 50V.
[0106] In the subsequent sintering step, 6kA / cm was applied during 500ms to 1000ms 2 up to 9kA / cm 2 Between current densities to obtain dense samples at voltages less than 10V. Between the activation phase and the sintering phase, a minimum time of 10 ms was established. A pressure of 100 MPa to 500 MPa is applied from the beginning of the process.
[0107] The density of the final flake measured by the Archimedes method is about 5.1 g / cm for TiC-25Ni 3 to 5.5g / cm 3 , and for TiC-25Fe is 5.1g / cm 3 to 5....
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