Preparation and Performance Investigation of PA6/CaSO4 Composite Powders for Selective Laser Sintering Molding

doi:10.19491/j.issn.1001-9278.2021.10.006

Abstract

Abstract:

In this study， PA6/CaSO₄ composite powders were prepared using a solvent precipitation method. Their microstructure， thermal properties， particle size distribution， crystal structure， and flowability were investigated by SEM， DSC， XRD and laser particle size?distribution analysis. The results indicated that the PA6/CaSO₄ composite powders transformed from a loose spherical structure to the dense spherical one with the addition of CaSO₄. The introduction of CaSO₄ increased the degree of crystallinity （X_c） of the composite powders and broadened their sintering temperature window. When the CaSO₄ content was 5 wt%， the X_c reached maximum value of 61.84 % and the sintering temperature window reached a maximum value of 18.95 °C. Moreover， the particle size and repose angle of the composite powders decreased at first and then tended to increase with an increase in the CaSO₄ content. However， their bulk density showed an increasing trend at first and then tended to decrease. The composite powders exhibited optimal flow performance at the CaSO₄ content ranging from 3 to 5 wt%， which was most suitable for selective laser sintering.

Key words: polyamide 6, calcium sulfate, composite powder, selective laser sintering

CLC Number:

TQ323.6

YANG Xiuqin, LIU Yihe, MIAO Shicheng, ZHU Dengchang, YU Xiang. Preparation and Performance Investigation of PA6/CaSO₄ Composite Powders for Selective Laser Sintering Molding[J]. China Plastics, 2021, 35(10): 31-36.

Figures/Tables 9

Fig.1. SEM images of PA6/CaSO4 composite powders

Fig.2. The first heating DSC curves of PA6/CaSO4 composite powders

CaSO₄含量/%	熔点/℃	熔融焓/J·g^-1	结晶度/%
0	218.27	111.02	48.27
1	218.49	119.45	52.46
3	219.30	123.10	55.18
5	220.45	135.13	61.84
7	218.60	118.34	55.32

Tab.1. Thermal performance of PA6/CaSO4 composite powders during heating process

Fig.3. The first cooling DSC curves of PA6/CaSO4 composite powders

Fig.4. The second heating DSC curves of PA6/CaSO4 composite powders

CaSO₄含量/ %	熔融起始温度/℃	结晶起始温度/℃	烧结温度窗口/℃
0	209.69	195.37	14.32
1	210.16	194.04	16.12
3	211.45	193.29	18.16
5	211.62	192.67	18.95
7	210.96	192.41	18.55

Tab.2. Sintering temperature window of PA6/CaSO4 composite powders

Fig.5. Particle size distributions curves of PA6/CaSO4 composite powders

Fig.6. XRD spectra of PA6/CaSO4 composite powders

CaSO₄含量/%	休止角/（°）	堆积密度/g·cm^-3
0	45.0	0.134
1	42.0	0.156
3	38.7	0.178
5	39.8	0.175
7	41.2	0.146

Tab.3. Flowability of PA6/CaSO4 composite powders

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Preparation and Performance Investigation of PA6/CaSO₄ Composite Powders for Selective Laser Sintering Molding

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