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采用in-situ PIT工艺,以不同纯度硼粉相互搭配做为前驱粉末中的硼源,选用中心铜铌复合棒增强的导体结构制备了MgB2六芯线材,研究了不同纯度硼粉搭配对线材粉末相组成、微观结构以及超导电性的影响,其结果表明当高纯硼粉含量不低于50%时,自场下的临界电流不存在明显的衰减,因此以适当低纯硼粉(95～97%)和高纯硼粉(99.999%)相互搭配不但不会降低线材的临界电流,而且可以很大程度上降低线材的制造成本,为线材的实用化提供了很好的经济基础.
In-situ PIT process, with different purity boron powder with each other as a precursor of boron source, selected center copper-niobium composite rod reinforced conductor structure prepared six-wire MgB2 wire, boron powder with different purity of wire powder Phase composition, microstructure and superconductivity, the results show that when the content of high purity boron powder is not less than 50%, there is no obvious attenuation of the critical current from the field, so with appropriate low purity boron powder (95 ~ 97%) and high purity boron powder (99.999%) can not only reduce the critical current of the wire, but also greatly reduce the manufacturing cost of the wire and provide a good economic foundation for the practical use of the wire.