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Preparation and defocusing forming method of low-cost ceramic powder for selective laser melting

A laser selective melting and ceramic powder technology, applied in the field of additive manufacturing, can solve the problems that ceramic materials are sensitive to stress and cracks, cannot completely suppress cracks, and the performance of formed parts is not good, so as to reduce the dependence on harsh conditions and optimize The effect of uniform distribution of temperature field, reduction of processing cost and threshold

Active Publication Date: 2020-09-22
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, research reports on SLM ceramics at home and abroad all use the spherical powder produced by the atomization granulation method as the raw material. The cost is high; in addition, ceramic materials are sensitive to stress and cracks, and laser beam irradiation causes a high temperature gradient in the molten pool area, so that the formed part is repeatedly subjected to thermal shock and cracks during the heating and cooling process, and the performance of the formed part is improved. Bad hidden dangers. At this stage, the method of high temperature preheating not only requires high equipment, complicated process, but also has extremely low efficiency and cannot completely suppress cracks, which limits the research and development of this technology.

Method used

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  • Preparation and defocusing forming method of low-cost ceramic powder for selective laser melting
  • Preparation and defocusing forming method of low-cost ceramic powder for selective laser melting
  • Preparation and defocusing forming method of low-cost ceramic powder for selective laser melting

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Embodiment 1

[0046] combine figure 1 As shown, the specific preparation process is:

[0047] Aluminum oxide and zirconium oxide with a purity of 99.5% are selected as raw material powders to prepare small cubes with a size of 8×8×8 mm by selective laser melting. The median particle size of alumina powder is 0.78 μm, and the powder presents an irregular flake shape; the median particle size of zirconia powder is 1 μm, and the powder presents an irregular polyhedral shape. Select the mass ratio of alumina and zirconia as 61.5:38.5, select alumina balls so that the mass ratio of balls to materials is 3:1, and use alcohol as the medium to mix evenly at 200r / min, take the ceramic slurry obtained by high-energy ball milling at 100 After drying for 2 hours under the environment of ℃ and 10KPa, sieve the powder, place the sieved powder in an argon atmosphere for annealing treatment, the heating temperature is 700 ℃, the holding time is 72h, and air cooling after holding the heat. A 99.9% dense f...

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Abstract

The invention relates to a preparation and defocusing forming method of low-cost ceramic powder for selective laser melting. The preparation and defocusing forming method comprises the following steps: preparing powder or a powder mixture of a ceramic material; design import and layer cutting of a CAD model; using a roller for carrying out powder laying and powder pressing procedures on the prepared powder or powder mixture of the ceramic material, and obtaining a powder layer blank; controlling the forming cylinder to ascend and descend, and putting the powder layer blank in a defocusing state; heating the specific area of the powder layer blank to the highest temperature through a melting heat source, and integrating solidification and densification after melting and cooling; judging whether all cutting layers are completed or not; recovering the powder raw material and taking out the formed part. According to the method, the low-cost irregular ceramic powder is fully utilized so that the raw material cost can be saved; the temperature field distribution of the molten pool is optimized through defocusing printing, and the temperature gradient is reduced. With application of the method, the problems of high requirements on SLM ceramic powder, harsh processing conditions, complex and cumbersome process and post-treatment, high part preparation cost, insufficient performance andthe like are solved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a low-cost laser selective laser melting (Selective Laser Melting, SLM) ceramic powder preparation and defocused forming method thereof. Background technique [0002] Ceramics and ceramic-based composites have excellent properties such as light weight, high temperature resistance, low thermal conductivity, insulation, and chemical stability, and are widely used in aerospace, electronic devices, biomedical, and building materials. Ceramic additive manufacturing technology is an advanced emerging manufacturing technology, which has the advantages of customization, high degree of design freedom, and environmental protection. It can realize the rapid design of complex structural ceramic parts, and has received widespread attention and rapid development. It is expected to promote A new round of technological change in the manufacture and application of ceramic materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10B33Y70/00B33Y80/00C04B35/04C04B35/057C04B35/14C04B35/45C04B35/46C04B35/48C04B35/50C04B35/505C04B35/56C04B35/565C04B35/622C04B35/64
CPCC04B35/10C04B35/48C04B35/505C04B35/50C04B35/04C04B35/057C04B35/45C04B35/46C04B35/14C04B35/565C04B35/5611C04B35/5615C04B35/5618C04B35/622C04B35/64B33Y80/00B33Y70/00C04B2235/3217C04B2235/3225C04B2235/3227C04B2235/3224C04B2235/3208C04B2235/3206C04B2235/3229C04B2235/3281C04B2235/3232C04B2235/3418C04B2235/3244C04B2235/3826C04B2235/3843C04B2235/5436C04B2235/6026C04B2235/656C04B2235/665Y02P10/25
Inventor 熊志伟张凯廖文和刘婷婷邹志永闫志隆陈丹陈香媛顾明飞
Owner NANJING UNIV OF SCI & TECH
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