Jicheng ZHOU
,
Baiyun HUANG
材料科学技术（英文）
A novel binder system for hardmetal powder extrusion moulding (PEM) process has been developed. The binder system comprises a major fraction of a mixture of low molecular weight components (LMWCs) and a minor fraction of very finely dispersed polymer. The feedstocks are mixed as a thick slurry at a suitable temperature and are rapidly homogenized by stirring at an adequate shear force. The binders are removed by thermal debinding. The thermal debinding mechanism has been investigated by thermogravimetry (TG) and differential thermogravimetry (DTG). At the first stage of debinding, the LMWCs are removed. These open up pore channels which allows much faster removal of the remaining polymer component during the subsequent stage. The microstructures of the moulded green parts were observed by scanning electron microscopy (SEM). The debound samples were sintered at different temperatures, and the sintered samples properties were measured.
关键词:
Binder
,
null
,
null
俞守耕
,
刘婀娜
,
张晓明
贵金属
doi:10.3969/j.issn.1004-0676.2004.04.006
用聚乙烯醇作分散剂,抗坏血酸作还原剂,将氯金酸还原到Au;以水合肼作还原剂,将氯铂酸盐还原到Pt,分别制备了Au粉和Pt粉;Au、Pt粉的平均尺寸分别为0.55μm和≈0.08μm.用氧化物和硼硅酸盐作粘结剂配制了1种玻璃粘结、3种混合粘结的浆料.浆料性能测量结果表明,一种性能较好的浆料有:拉伸强度＞20N/mm2,烧结后收缩≤0.003mm,片电阻率≤40mΩ/□/25μm,30次浸锡后的溶蚀量为0.062～0.087mm.CuO溶入玻璃改善了化学键,从而提高了附着力.
关键词:
金属材料
,
厚膜微电子技术
,
Au-Pt导体
,
焊区
,
粘结剂
郝素菊
,
张文博
,
蒋武锋
,
张玉柱
,
高春群
上海金属
随着我国含锌粉尘排量的不断增加,环境及人类健康受到的危害也越来越严重,因此钢铁企业含锌粉尘的有效处理是环境及经济的客观要求.实验提出利用熔融钢渣的显热处理含锌粉尘并回收金属锌的方法.实验研究发现,当煤粉的质量分数为16％,粘结剂的质量分数为7％,球团直径为12 mm时氧化锌的还原效果较佳.煤粉含量和粘结剂是影响氧化锌还原效果的重要因素之一.
关键词:
熔融钢渣
,
含锌粉尘
,
煤粉含量
,
粘结剂
,
还原效果
