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Selective sintering of polymer matrix composites
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A technology of polymers, thermoplastic polymers, applied in the field of manufacturing said three-dimensional objects, capable of solving problems such as increased possibility of being torn off
Pending Publication Date: 2022-04-01
EOS ELECTRO OPTICAL SYST
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As a result, there is an increased likelihood that components will be torn from the powder bed due to the subsequent coating process
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specific Embodiment approach
[0321] The following examples are for illustrative purposes and they should not be construed as limiting.
[0322] Determine the powder ratio (in volume %) of the second powder:
[0323] In the whole mixture [second powder (P2)+first powder (P1)], the volume ratio of the second powder (P2) can be calculated from the weight of the powder and the bulk density of the powder using the following formula.
[0324]
Embodiment 1
[0328] First powder (PEKK-CF 1 - powder with reinforcement)
[0329] Composite powder (HT23; Advanced Laser Materials, Temple, TX, U.S.) of 23% by weight carbon fiber-filled PEKK copolymer having repeating units of 60% terephthaloyl groups and 40% isophthaloyl diformyl group. The average fiberdiameter is 7 μm. The fibers are substantially completely surrounded by the polymer matrix. The powder is characterized by a melt flow index (melt volume rate; MVR) of 46.8 cm 3 / 10 minutes, and T ei,m It is 268.0°C. The bulk density is 0.54g / cm 3 , the particle size distribution is given by (D 10 / D 50 / D 90 ) Characterization: 45.9 μm / 84.2 μm / 113.1 μm.
[0330] Secondary powders (K6003-2, -3, -4 - powders without reinforcement)
[0331]A coarse powder of PEKK copolymer (Kepstan 6003PF, Arkema, France) having repeating units of 60% terephthaloyl groups and 40% isophthaloyl groups, and classified into corresponding particle sizes using a wind separator. The powder was then pr...
Embodiment 2
[0347] The first powder (PEKK-CF 2)
[0348] A 27% by weight carbon fiber filled PEKK copolymer (having repeating units of 60% terephthaloyl groups and 40% isophthaloyl groups) was prepared analogously to HT23 (ALM, Temple, TX, USA). ) composite powder. The powder is characterized by an MVR value of 14.8 cm 3 / 10 minutes, and T ei,m It is 268.2°C. The bulk density is 0.60g / cm 3 , the particle size distribution is characterized by (D 10 / D 50 / D 90 ): 429μm / 85.9μm / 124.5μm.
[0349] Second powder (K6003-2)
[0350] Similar to Example 1
[0351] Composite blend powder (powder mixture)
[0352] The preparation procedure was similar to Example 1; the mixing conditions and characterization of the powder mixture are indicated in Table 4 below.
[0353] Table 4: Powder properties of the powder mix of Example 2.
[0354]
[0355] result
[0356] For all examples, the replaceable frame temperature and build platform temperature were 265°C. The mechanical data and associ...
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Abstract
The invention relates to a powder mixture for use as a building material for the production of a three-dimensional object by consolidating the building material in a layer-by-layer manner, in particular by exposure to radiation, at locations in the respective layers corresponding to the cross-section of the three-dimensional object, wherein the powder mixture comprises a first powder and a second powder wherein the first powder comprises powder particles of a first thermoplasticpolymer material and a reinforcing material wherein the reinforcing material is at least partially embedded in the powder particles of the first powder and / or adheres to the surface of the powder particles of the first powder, wherein the second powder comprises powder particles of a second thermoplasticpolymer material, the second thermoplasticpolymer material being the same as or different from the first thermoplastic polymer material, wherein the powder particles of the second powder do not contain reinforcing material or only contain reinforcing material in a proportion of up to 50 wt% relative to the proportion of reinforcing material in or on the powder particles of the first powder.
Description
technical field [0001] The present invention relates to a powder mixture for use as a building material for the manufacture of a three-dimensional object by making the building material layer by layer at positions in the respective layers corresponding to the cross-section of the three-dimensional object This is achieved by means of consolidation, in particular by exposure to radiation. Furthermore, it is an object of the present invention to provide a method for preparing the powder mixture according to the invention, a three-dimensional object manufactured from the powder mixture according to the invention, in particular by selective sintering by means of electromagnetic radiation, and a Use of a powder mixture for producing said three-dimensional objects. Background technique [0002] As is known, for example, from DE 44 10 046, a method for producing a three-dimensional object can be carried out in a layer-by-layer manner by selective sintering by means of electromagnet...
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