Wei WU
,
Zai FENG
材料科学技术（英文）
A systematic (Gd1-xREx)5Si4 (RE=Dy, Ho) alloys are investigated to estimate their magnetocaloric effect. The Curie points of (Gd1-x REx)Si4 alloys can tunable from 266 K to 336 K when RE=Dy, Ho; x=0~0.35 and 0~0.15, respectively, and decrease nearly linearly with increasing x. These alloys keep orthorhombic structures Ge5Sm4 and exhibit second order transition when they experience in a change magnetic field at about Curie points. The weight and voluminal magnetic entropy changes are about 3.5 J/(kg•K) and 23~29 mJ/(cm3•K) when magnetic field changes 0~2 T. The adiabatic temperatures changes (▽Tad) of these alloys at Curie points are larger than 1 K in a field change 0~1.4 T, the curve of ▽Tad is wide as that of Gd. The relative cooling power is about 0.8~0.9 J/cm3 when field changes 0~2 T, 55% of that of Gd. Comparing with Gd5(Si1-xGex)4, these alloys do not contain expensive element Ge, so that their cost are lower than the former. Because they could work at temperature region 260~340 K due to their Curie points can be tuned, which is an advantage comparing with Gd, these alloys are potential magnetic refrigerants working in a magnetic refrigerator with a low magnetic field at room temperatures.
关键词:
Magnetocaloric effect
,
null
,
null
李凤娟
,
吕国光
金属世界
doi:10.3969/j.issn.1000-6826.2014.04.14
通过对烧结配料所需原料及对冷烧结矿成品检验采制样方法的分析，找出影响检验结果真实性的因素，采取有效的改进措施，使本钢原料厂一次配料、本钢炼铁厂265 m2烧结二次配料及265 m2烧结系统各项稳定率有了很大的提高，烧结矿实物质量和各项技术质量指标有了很大的进步，保证了高炉的稳定顺行。
提高本钢265 m2冷烧结矿及原料检验代表性的实践
Practice of Improving the 265 m2 Cold Sinter and Raw Material Inspection Representative
供稿|
李凤娟,吕国光/
LI Feng-juan, LV Guo-guang
DOI：10.3969/j.issn.1000-6826.2014.04.14
导读内容
本钢炼铁厂265 m2烧结机生产所需要的含铁原料比较复杂，一次配料料种较多，且烧结含铁原料是由本钢原料厂二车间供料，原料质量的不稳定，会影响烧结矿质量的提高和新一号高炉的强化及高炉技术指标的改善。本钢质量管理中心驻冷烧检查站加强了对烧结配料所需原料及对冷烧结矿成品检验采制样代表性的研究，采取了一些改进措施，达到了良好的效果。含铁料成分稳定率、烧结矿各项质量和技术指标在稳步地提高。下面，对本钢质量管理中心驻冷烧检查站就提高采样及检验过程的准确性所采取的措施和办法进行说明。
烧结矿采样是半自动采样，每两小时采样一次，作为一个批次，来代表整个2h烧结矿的成份。
关键词:
