3D打印技术可实现产品的快速无模制备,有望解决封接玻璃预制件生产过程中模具加工、维护成本高的难题。以玻璃造粒粉和固化剂为原料,将激光选择性烧结技术用于封接玻璃预制件的制备。实验结果表明:封接玻璃造粒粉适用于逐层铺粉的激光选择性烧结成型;制备造粒粉的黏结剂为聚乙二醇,用于激光烧结成型的固化剂为聚苯乙烯,其适宜的添加质量分数为20%;将固化剂与玻璃造粒粉均匀混合,经激光选择性烧结后得到尺寸规则的预成型体,再经加热排胶处理以充分去除黏结剂和固化剂,获得强度符合要求的封接玻璃预制件;该技术可用于封接玻璃预制件等产品的快速无模生产。

As a rapid dieless production method, 3D printing is promising to avoid the high cost of mold manufacturing and maintenance in the preparation of sealing glass preforms. Glass preforms are prepared by selective laser sintering (SLS) with granule and curing agent as main ingredients. The experimental results show that sealing glass powder granule can be applied to SLS process by powder laying, while polyethylene glycol (PEG) is used as binder to form granule, and polystyrene (PS) with a proper mass fraction of 20% is used as curing agent for laser sintering. Preforms with regular size can be obtained by selective laser sintering the homogeneous mixture of curing agent and granule. After laser sintering, preforms have to be heated to expel the organic agent, and then it becomes the sealing glass preforms meeting the strength requirement. The technology can be applied to the rapid dieless manufacturing of sealing glass preforms.