共查询到20条相似文献,搜索用时 218 毫秒
1.
研究了利用废聚苯乙烯泡沫制备铸造用EPS乳液粘结剂的方法.粘结剂采用废EPS为主要原料,通过溶解、乳化、改性等方法,制备了一种液态的粘结材料,制成的型砂可通过吹入CO,气体进行硬化.通过试验对该EPS粘结剂混合溶剂、乳化剂、改性剂等工艺参数进行了优化,并设计了最佳的制备工艺路线.结果表明,以二甲苯、丙酮、乙酸乙酯为溶剂的最佳配比为:二甲苯:丙酮:乙酸乙酯=2:2:3(体积比).采用复合乳化剂进行乳化处理,在乳化剂5%、温度为55℃下,乳化1.5 h取得较好效果.最终粘结剂在加入$3%的情况下,初强度达到0.50 MPa,终强度达到2.4 MPa. 相似文献
2.
3.
EPC法制备表面耐磨铸铁用耐磨涂料的研究 总被引:1,自引:0,他引:1
采用EPC法,在聚苯乙烯(EPS)泡沫模型表面涂刷耐磨涂料,浇注后铁水渗入耐磨涂层,得到表层复合材料铸铁。耐磨涂剂主要组成为SiC粉、EPS颗粒、Cr-Fe粉、助渗剂、粘结剂等。研究了涂料中SiC、EPS对渗层表面品质、渗层组织及耐磨性的影响,试验结果表明:当涂料中SiC粒度为0.002mm、体积分数为50%时,铸铁表面耐磨性最好,磨损量是基体铸铁的37%. 相似文献
4.
5.
作者用醛基和胺基材料对聚乙烯醇进行了复合缩聚改性.用红外光谱仪和扫描电镜等手段研究了改性聚乙烯醇粘结剂的化学结构及型砂性能机制.生产应用结果表明,该粘结剂具有存放期长、劳动环境好,成本低、节省能源、型砂强度高、溃散性好等优点. 相似文献
6.
7.
8.
金属注射成形用新型聚乙二醇基粘结剂的研究 总被引:1,自引:1,他引:0
研究了一种新型聚乙二醇(PEG)基热塑性粘结剂,它由高密度聚乙烯、聚乙二醇、聚合物W、硬脂酯、邻苯二甲酸和二辛脂和抗氧剂等组成。新型PEG基粘结剂与Fe-2Ni粉具有较强的相互作用,混合均匀性好,且粉末装载量高,喂料注射成形性好。用新型PEG基粘结剂和Fe-2Ni粉所制备的喂料是一种假塑性流体,具有良好的流变性能。新型PEG基粘结剂用乙醇溶剂脱脂,速度快、缺陷少、维形能力强,且可避免环境污染。 相似文献
9.
ZS—新型铸造粘结剂的性能与应用 总被引:1,自引:0,他引:1
本文介绍一新型铸造粘结剂的成份及各种性能。通过实验与生产验证,该粘结剂具有加入量少,流动性好,干拉强度高,烘干温度范围宽,发气量低,退让性、存放性好,无毒、无刺激性气味等优点。且价格低廉。是植物油、合脂油、渣油等理想的替代产品。 相似文献
10.
11.
12.
13.
14.
15.
Chemically bonded sand cores and molds are more commonly referred to as precision sand systems in the high production automotive powertrain sector. Their behavior in contact with molten metal can lead to casting defects. Consequently, the interaction is of great interest and an important part of metal casting technology. The American Foundry Society(AFS) sand testing is based on physical, mechanical, thermal and chemical properties of the sand system. Foundry engineers have long known that certain AFS sand tests provide limited information regarding control of molding and casting quality. The inadequacy is due to the fact that sand casting processes are inherently thermo-mechanical, thermo-chemical and thermo-physical. Non-standard foundry sand testing has proven useful for laboratory measurement of these characteristics in foundry sand using a disc-shaped specimen. Similarly, the equivalent disc-shaped specimens are used for casting trials. In order to accomplish near-net-shape casting with minimal defects, it is necessary to understand both the properties of the sand system, as well as the interface of molten metal when different binders, additives and/or refractory coatings are used. The methodology for the following non-standard chemically bonded sand tests is described:(1) disc transverse;(2) impact;(3) modified permeability;(4) abrasion;(5) thermal distortion;(6) quick loss on ignition. The data related to the non-standard sand tests were analyzed and interpreted. The test results indicate that there is relatively lower test-to-test variability with the disc-shaped specimens. The non-standard tests were able to discriminate between the chemically bonded polyurethane cold box sand specimens. Further studies should be conducted on various other sand and binder systems as well as on different specimen thicknesses. 相似文献
16.
针对V型船用发动机气缸体铸件尺寸相对较大,砂型和砂芯一般都使用树脂做粘结剂,且大多数采用立式全包裹砂芯浇注方式,砂型和砂芯遇高温铁液,树脂会分解产生大量气体,若不能及时排出气体,从而导致铸件产生气孔、气隔、及气缩等缺陷的问题,因此对砂芯生产工艺和排气系统进行了一系列改进,批量生产出合格铸件. 相似文献
17.
菜籽油脚与花生油脚改性为铸造用粘结剂研究 总被引:2,自引:0,他引:2
介绍一种以菜籽油脚和花生油脚为原料,通过脱水、缩合、氧化聚合、增强、增稠,改性制成的铸造用粘结剂。该粘结剂性能优于GB12216-90指标。已有三家工厂投产,不仅有较好的经济效益,而且消除了油脚对环境的污染。 相似文献
18.
19.