共查询到20条相似文献,搜索用时 453 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
《轻金属》2004,(2):33-33
随着我国电解铝产量的不断扩大 ,全国各大铝厂已普遍采用 2 0kg连续铸锭机组。由于 2 0kg连续铸锭机普遍存在着脱模率较低的现象 ,给生产造成诸多不便。针对这种情况 ,深圳市瑞宝威实业发展有限公司研制并成功推广了铝锭铸造脱模涂料 ,相对于传统自制脱模剂 ,新型涂料具有如下优点 :1 .脱模效果良好 ,相对于使用传统脱模剂或不使用脱模涂料的锭模 ,脱模率可显著提高 ;2 .铝锭表面质量有明显提高 ,使用该涂料的铝锭表面光亮度优于使用其它涂料的表面 ;3.用量少 ,使用成本低廉 ;4 .pH6~ 7,不与铝发生化学反应 ,不会污染环境 ,不腐蚀铝锭表面… 相似文献
9.
《轻金属》2003,(10)
随着我国电解铝产量的不断扩大 ,全国各大铝厂已普遍采用 2 0kg连续铸锭机组。由于 2 0kg连续铸锭机普遍存在着脱模率较低的现象 ,给生产造成诸多不便。针对这种情况 ,深圳市瑞宝威实业发展有限公司研制并成功推广了铝锭铸造脱模涂料 ,相对于传统自制脱模剂 ,新型涂料具有如下优点 :1.脱模效果良好 ,相对于使用传统脱模剂或不使用脱模涂料的锭模 ,脱模率可显著提高 ;2 .铝锭表面质量有明显提高 ,使用该涂料的铝锭表面光亮度优于使用其它涂料的表面 ;3.用量少 ,使用成本低廉 ;4 .pH6~ 7,不与铝发生化学反应 ,不会污染环境 ,不腐蚀铝锭表面 … 相似文献
10.
11.
《International Journal of Cast Metals Research》2013,26(1-4):209-213
AbstractSiC particle preforms were infiltrated with spheroidal graphite cast iron melt by vacuum assisted casting in the sand mould, and spheroidal graphite cast iron composites in which the particles were dispersed in the surface region were fabricated. Although the melt infiltration was not accomplished when the melt was poured under atmospheric pressure, the infiltration was accomplished by the vacuum assisted casting when the SiC particle volume fraction and preform thickness were optimised. When the Si content of the cast iron was 2˙5 mass%, the phase consisting of mainly Fe3Si was formed at the particle/matrix interface due to the reaction between the cast iron melt and the particles during the infiltration. The matrix of the composite consisted of fine spheroidal graphite particles, ferrite, pearite and chill crystal. Although the increase in the Si content suppressed the reaction and chill, no infiltrated area was observed in the composite. 相似文献
12.
合金元素对中硅耐热铸铁性能影响研究及在铸铝模具上的应用 总被引:1,自引:0,他引:1
通过在中硅耐热铸铁中添加不同组合的合金元素稀土、铜、钛使其合金化,经过孕育和球化处理,得到铁素体 珠光体 球状石墨的金相组织。研究发现,铜的加入增加了中硅耐热铸铁的导热性提高了抗氧化生长能力;稀土的加入细化了晶粒,改善了氧化膜的粘附性,提高了热疲劳性;钛的加入恶化了石墨分布,增加了石墨和铁素体总量,导致了耐热铸铁强度下降。稀土、铜共同加入得到了比较规整的球状石墨,综合性能表现良好。该方案成功解决了某铸铝厂铸铝模具在高温作业中寿命不足的问题。 相似文献
13.
14.
15.
Taku Ohide 《International Journal of Cast Metals Research》2013,26(5):279-284
A new melt combination process which can control the graphite morphology from spheroidal, compacted-vermicular to flake in cast iron has been developed by a modified Inmold process. Two reaction chambers were prepared in one sand mould. One reaction chamber was for spheroidizing and the other was for inoculating. After being poured into the sprue, the molten iron, of a given chemical composition, was separated in the runner and passed through each reaction chamber. The separated metal streams then collided with each other and filled the cavity. As a result, a new iron, with one side having the properties of spheroidal graphite cast iron and the other the properties of flake graphite cast iron, was produced. The graphite structure has usually been controlled using filters, dams or chillers. 相似文献
16.
AbstractThis investigation was carried out to identify the major factors and their degree of influence on the dimensional accuracy of spheroidal-graphite iron castings produced in chemically- bonded sand moulds. Test castings were poured into furan-resin-bonded zircon sand and silica sand moulds and sodium silicate/ CO2 bonded silica sand moulds. A comparison of casting sizes with those of the mould cavity into which they were poured showed considerable scatter and overlap. From these data the size that each casting would have had, had it solidified without graphite formation, was calculated and found to depend on mould cavity size for each type of mould. By isolating the differences in casting size due to graphite it was possible to identify the influencing factors. Thus castings poured into furan-resin-bonded zircon sand have the highest contraction and their size depends primarily on the amount of graphite present. The dimensions of castings poured into silica sand moulds show more variation and depend not only on the amount of graphite present and the structure of the metal but also on the thermal expansion of the silica sand moulds. 相似文献
17.
18.
19.
20.
《International Journal of Cast Metals Research》2013,26(1-4):81-85
AbstractAlthough it is known that the addition of bismuth refines the graphite nodule in spheroidal graphite cast iron, the refinement mechanism has not yet been clarified. In this research, the effect of bismuth on the refinement has been investigated by examining the microstructure of the spheroidal graphite cast iron containing a small amount of bismuth. Bismuth was added at 0˙01 mass% to the spheroidal graphite cast iron melt containing 3˙5–3˙7 mass% carbon and 2˙0– 2˙8 mass% silicon, then the melt was poured into the mould to obtain the stepped test bar with 2, 3, 5 and 10 mm thicknesses. The graphite nodule increased as the bismuth content increased. The diameter of the graphite nodule decreased as the thickness decreased, namely, as the cooling rate increased. The graphite nodule was further refined by the addition of bismuth. The increase in silicon content increased the graphite nodule count and the ferrite in the matrix. It postulated that bismuth exists as simple substance or a compound in the vicinity of the nucleus of the graphite. 相似文献