用于丝网印刷的掺杂硅浆料

利用等离子体气相合成法制备硅纳米颗粒,配制出基于硅纳米颗粒的用于丝网印刷的掺杂硅浆料。当硅浆料中磷硅原子比不小于0.45、磷的质量分数浓度在6.32%以上,或硼硅原子比不小于0.90、硼的质量分数浓度在1.75%以上时,用丝网印刷硅浆料能够实现方块电阻在50Ω/□以下的重掺效果,表明掺杂硅浆料有望应用于太阳电池的制备。

C－103铌合金上Si－Cr－Ti料浆熔烧涂层的改性研究

进行了Ｃ－１０３铌合金上的Ｓｉ－Ｃｒ－Ｔｉ料浆熔烧涂层改性研究，在涂层料浆中添加活性元素锆（Ｚｒ）和惰性氧化物（Ｙ＿２Ｏ＿３）。通过实验，确定了改性方法的工艺参数。改性后的涂层其抗氧化性能有明显提高。利用现代测试技分析了涂层的结构、元素分布、相分布。初步讨论了该涂层的抗氧化机理。

矿物掺合料对压浆料性能研究

通过对三种矿物掺合料沉珠、微硅粉、矿粉的单掺试验,分析每种矿物掺合料对压浆料流动性、泌水性、力学性能的影响,以此确定掺量范围,并进行正交优化试验,给出满足标准要求下各矿物掺合料最佳掺量。研究结果表明,沉珠可以很好的提高流动性能,微硅粉可以提高7 d抗折强度,矿粉可以提高力学性能,三种掺合料同时掺入并进行正交实验,最优掺量为沉珠20%、微硅粉10%、矿粉10%。

掺硼纳米硅颗粒的脉冲放电制备及测试分析

以掺硼硅锭(电阻率0.01Ω·cm)作为原材料,在液体介质中采用脉冲放电法制备出掺硼纳米硅颗粒。利用扫描电子显微镜(SEM)、X射线衍射(XRD)、纳米粒径电位分析(PSDA)、原子发射光谱(ICP-OES)等测试手段对获得的产物进行测试分析,绝大部分纳米硅颗粒尺寸集中在30~60 nm,其硼含量的质量分数为19×10-4%。在此基础上,将制备纳米硅颗粒配制为质量分数为15%的纳米硅浆料,通过丝网印刷在太阳硅片上,经850℃高温烧结后,硅片表面方阻可由100Ω□/降到30Ω□/。

皮秒激光熔覆硼掺杂硅纳米浆料的实验研究

采用硼掺杂的硅纳米颗粒和有机载体混合配制的硅浆料作为原料，以标准太阳能电池工艺中的预处理硅片作为基片，在硅片背面丝网印刷硅浆料，烘干后形成硅纳米薄膜，经皮秒激光熔覆形成掺杂的硅熔覆层，同时硼元素扩散进入硅基片。采用激光形貌仪、扫描电子显微镜、二次离子质谱等手段分析了熔覆层的组织结构和硼元素的掺杂情况。结果表明，皮秒激光形成的硅熔覆层组织均匀致密，与基体之间结合紧密，无裂纹、孔洞等缺陷。硅熔覆层中的硼掺杂浓度最高达到3×10^19atom／cm3，在硅基体内扩散深度为0．5～1μm。在中电电气（南京）光伏有限公司太阳能电池生产线上进行了电池制备实验，平均光电转换效率达到20．3％。

Fabrication of MoSi;coatings on molybdenum and its high-temperature anti-oxidation properties

Industrial spent MoSi_(2)-based materials were used to fabricate oxidation-resistant coatings on molybdenum via slurry painting in air. The microstructure, phase constituent and high-temperature oxidation behaviors of the coatings at 1500 ℃ were explored. The results show that the bonding layer is generated in the coatings after sintering,which strengthens the metallurgical combination between the coating and the substrate because of the formation of diffusion layers. Rare cracks appear in the coating using pure MoSi_(2)(PM coating) while the coating using spent MoSi_(2)(SM coating) is free of cracks due to decreased thermal expansion mismatch. After oxidation, the oxide scale of PM coating possesses large-sized pores while a relatively dense oxide scale is acquired by SM coating. Compared with PM coating, thinner glassy oxide scale with lower mass gain is obtained by SM coating, exhibiting better anti-oxidation properties at 1500 ℃.

Microstructure evolution of Al-Si semi-solid slurry by gas bubble stirring method

A novel technique of introducing gas bubble stirring during solidification was studied to prepare Al-Si semi-solid slurry. The microstructure evolution of the slurry during slow cooling process after stirring was investigated. The effects of the solidification rate on the microstructure of the semi-solid slurry were investigated under three different solidification conditions. The results show that fine non-dendritic slurry can be obtained using the gas bubble stirring method. Ripening and coarsening of primary Al grains are observed during the slow cooling process, and at last coarsened eutectic Si appears. Primary Al grains with different sizes and eutectic Si are obtained, corresponding to three different solidification rates.