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公开(公告)号：US20210283687A1
公开(公告)日：2021-09-16
申请号：US16606885
申请日：2018-02-09
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Krzysztof Nauka , Paul Olubummo
Abstract: The present disclosure is drawn to a three-dimensional printing system can include a powder bed material, including from 80 wt % to 100 wt % metal particles having a D50 particle size distribution value ranging from 5 μm to 75 μm and a powder bed support substrate for receiving the powder bed material. The system can also include a fluid ejector operable to digitally deposit a thermally sensitive binder fluid onto a selected portion of the powder bed material on the powder bed support substrate. The thermally sensitive binder fluid can include water, a reducible metal compound, and a thermally activated reducing agent. A light source can also be present to generate a pulse energy sufficient to cause the thermally activated reducing agent to reduce the reducible metal compound and bind metal particles together to form a green three-dimensional part.
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公开(公告)号：US20210283686A1
公开(公告)日：2021-09-16
申请号：US16605343
申请日：2018-02-09
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Paul Olubummo , Krzysztof Nauka
Abstract: A material set can include a powder bed material including from 80 wt % to 100 wt % metal particles and a thermally sensitive binder fluid. The metal particles can have a D50 particle size distribution value ranging from 5 μm to 75 μm. The thermally sensitive binder fluid can include an aqueous liquid vehicle, a reducible metal compound, and a thermally activated reducing agent.
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公开(公告)号：US20210138725A1
公开(公告)日：2021-05-13
申请号：US16605140
申请日：2018-03-15
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Kristopher J Erickson , Paul Olubummo , Aja Hartman , Lihua Zhao
IPC: B29C64/165 , B29C64/291 , B33Y10/00 , B33Y30/00 , B33Y70/00 , C08K3/04
Abstract: A three-dimensional printing system can include polymeric build material and jettable fluid(s). The polymeric build material can have an average particle size from 20 μm to 150 μm, a first melt viscosity, and a melting temperature from 75° C. to 350° C. In one example, the jettable fluid can include water, from 0.1 wt % to 10 wt % of electromagnetic radiation absorber, and from 10 wt % to 35 wt % of an organic solvent plasticizer. Contacting a first portion of a layer of the polymeric build material with the jettable fluid can provide an organic solvent plasticizer loading from 2 wt % to 10 wt % based on the polymeric build material content. The first melt viscosity of the polymeric build material at the first portion can be reduced and the melting temperature of the polymeric build material at the first portion can be decreased by 3° C. to 15° C.
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公开(公告)号：US10857733B2
公开(公告)日：2020-12-08
申请号：US16077753
申请日：2017-02-06
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Yan Zhao , Lihua Zhao , Paul Olubummo , Aja Hartman , Howard S. Tom
IPC: B29C64/268 , B29C64/165 , B29C64/291 , B29C64/393 , C09D11/50 , B33Y70/00 , B33Y10/00
Abstract: In an example of a three-dimensional (3D) printing method, a polymeric or polymeric composite build material is applied. A fusing agent is selectively applied on at least a portion of the polymeric or polymeric composite build material. The fusing agent includes a discolorable near-infrared absorbing dye, a thiol surfactant, a reducing agent, and a balance of water. Near-infrared radiation is applied to the polymeric or polymeric composite build material at a condition that maintains a temperature of the selectively applied fusing agent below a decomposition temperature of the fusing agent and that allows the discolorable near-infrared absorbing dye to harvest near-infrared radiation energy, in order to fuse the portion of the polymeric or polymeric composite build material in contact with the fusing agent to form a layer and to initiate discoloration of the discolorable near-infrared absorbing dye in the layer.
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