K.H.W.Seah(Dept. of Mechanical Engineering
,
National University of Singapore
,
10 Kent Ridge Crescent
,
Singapore 119260)R.S.Kulkarni and S.C.Sharma (Dept. of Mechanical Engineering
,
R.V.College of Engineering
,
Mysore Road
,
Bangalore-560-059
,
Karnataka
,
Ind
材料科学技术（英文）
This paper reports some results obtained in an investigation to see how increasing the corundum dispersoid content from 0% to 7% in a matrix of as-cast and wrought hiduminium alloy affects the hardness. wear resistance and fracture toughness of the composite. The results show that as the corundum content is increased, the hardness and the wear resistance increase remarkably,whereas the fracture toughness drops significantly. It was found that Just a minute amount of corundum is sufficient to cause a fairly large change in these mechanical properties. The hardness of the material is also affected signifIcantly by the aging time. Moreover, if other factors are kept constant, hot extrusion improves both its hardness and its wear resistance. whereas the fracture toughness is decreased
关键词:
K.H. W. Seah(Dept. of Mechanical Engineering
,
National University of Singapore
,
10 Kent Ridge Crescent
,
Singapore 0511)R.S.Kulkari and S.C.Sharma (Dept. of Mechanical Engineering
,
R.V.College of Engineering
,
Mysore Road
,
Bangalore-560-059
,
Karnataka
,
Indi
材料科学技术（英文）
This paper reports some results obtained in an investigation to see how increasing the corundum dispersoid content from o% to 7% in a matrix of hiduminium alloy affects the tensile and compressive strengths, the hardness and the casting characteristics of the composite. The results show that as the corundum content is increased, ultimate tensile strength (UTS)- compressive strength and hardness increase remarkably, whereas fluidity of the molten composite during casting drops significantly. It was found that just a minute amount of corundum is sufficient to cause a fairly large change in the mechanical properties and the fluidity of the molten material.This drop in castability is one of the reasons why adding corundum beyond 7 percent is not recommended. If other factors are kept constant, the fluidity is seen to slightly improve if the pouring temperature of the molten metal were increased from 670 to 710℃
关键词:
蒋吉磊
,
苏秀霞
,
惠媛媛
,
李仲谨
涂料工业
doi:10.3969/j.issn.0253-4312.2012.02.004
以硝化纤维(NC)、异佛尔酮二异氰酸酯(IPDI)、二羟甲基丙酸(DMPA)等为主要原料,制得自乳化型水性硝化纤维乳液,再加入可水解自交联的硅烷偶联剂KH560,其分子中的环氧基与羧基反应,从而制备出KH560改性水性硝化纤维乳液.通过傅里叶变换红外光谱(FT-IR)、透射电子显微镜(TEM)、热重分析(TGA)法等测试手段,研究了KH560和DMPA的含量对乳液及其涂膜性能的影响.结果表明:当w(KH560)=7％,w(DMPA)=3.5％时,改性后的乳液具有良好的稳定性,涂膜的耐水性、耐乙醇性、热性能、力学性能均得到明显改善.
关键词:
水性硝化纤维
,
KH560
,
改性
,
乳液
,
涂膜
,
性能
魏美英
,
王新敏
,
青双桂
,
罗仲宽
,
郑海兴
,
刘世权
材料导报
以γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)和γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)为改性剂,正硅酸乙酯(TEOS)为前驱体,盐酸(HCl)为催化剂,利用溶胶-凝胶法制备SiO2/KH560/KH570增透膜.研究了反应物配比对溶胶性能的影响,测试了薄膜的光学以及力学性能.结果表明,随着酸用量的增加,溶胶粘度增加,凝胶时间缩短;SiO2/KH560/KH570薄膜在波段350～800nm间平均透过率增加3％～4％,具有良好的增透效果,而且抗划伤能力强.
关键词:
溶胶-凝胶法
,
增透膜
,
KH560
,
KH570
王雪明
,
李爱菊
,
李国丽
,
王威强
机械工程材料
doi:10.3969/j.issn.1000-3738.2005.11.003
利用KH-560在不同溶剂中水解的硅烷溶液,在金属基体上加热固化形成硅烷膜.研究了水解溶剂、水解时间、溶液浓度和固化温度对硅烷膜与基体粘结强度的影响,揭示了结合机理.结果表明:采用混合溶剂水解48 h,硅烷质量分数在10%左右,在100～200℃固化时硅烷膜与基体具有良好的粘结性能.
关键词:
硅烷偶联剂
,
涂层
,
粘结强度
,
结合机理
杨芳
,
马文石
,
王奉平
高分子材料科学与工程
采用γ-(2,3-环氧丙氧)丙基三甲氧基硅烷(KH-560)对液体聚硫橡胶进行封端改性,制备出一种新型端烷氧基硅烷改性聚硫橡胶.用化学滴定法测定了反应中巯基的转换率,用傅里叶变换红外光谱(FT-IR)、核磁共振氢谱(1H-NMR)对改性聚硫橡胶的结构进行了分析,用凝胶渗透色谱(GPC)测定了改性聚硫橡胶的分子质量.研究结果表明,KH-560的环氧基与液体聚硫橡胶的巯基发生了反应,通过调节反应物的比例可以控制巯基的转换率,改性聚硫橡胶的数均相对分子质量(Mn)为3641,多分散系数(PDI)为1.578,改性聚硫橡胶可以作为单组分弹性聚硫密封胶的基胶.
关键词:
液体聚硫橡胶
,
γ-(2,3-环氧丙氧)丙基三甲氧基硅烷
,
封端改性
,
单组分密封胶
魏铭
,
胡巧玲
,
田祚强
材料保护
过去,对硅溶胶制备的研究仅限于对单溶剂的定性探讨.应用溶胶凝胶法制备了稳定的正硅酸四乙酯(TEOS)/γ-(2,3-环氧丙氧)丙基三甲氧基硅烷(KH560)的杂化硅溶胶.采用在线电导率测试、红外跟踪技术及相关性能测试方法研究了异丙醇、乙醇、甲醇溶剂,盐酸、甲酸、乙酸催化剂对TEOS/KH560水解过程及杂化硅溶胶性能的影响.结果表明,不同溶剂、催化剂对杂化硅溶胶的性能有很大的影响:醇水混合溶剂比单独醇、水溶剂对原料的水解程度更好;随着醇碳链长度的增加,杂化硅溶胶的黏度降低,稳定性及产率提高;以盐酸为催化剂,杂化硅溶胶的存储时间比以甲酸、乙酸催化的短;选择异丙醇:硅醇摩尔比为1:13,以甲酸作催化剂,pH值为3.5左右时,杂化硅溶胶的性能最佳.
关键词:
杂化硅溶胶
,
TEOS/KH560
,
溶胶凝胶
,
醇溶剂
,
酸催化
,
电导率
韩利华
,
马庆国
,
冯晓健
,
康举
材料工程
doi:10.3969/j.issn.1001-4381.2010.06.010
利用正交实验研究了硅烷偶联剂在镀锌板上的钝化工艺,采用KH-560对热镀锌板进行钝化处理.比较钝化膜与空白试样在5%NaCl溶液中的极化曲线、电化学交流阻抗谱,并通过盐水浸泡实验进一步验证了硅烷膜的耐蚀性能.结果表明:经硅烷钝化处理后的镀锌板,其腐蚀电流密度下降,极化电阻升高,硅烷膜抑制了镀锌板的腐蚀过程,其耐蚀性能优于空白试样,接近铬酸盐钝化膜的耐蚀性.
关键词:
硅烷膜
,
镀锌层
,
铬酸盐
,
耐蚀性能
魏文政
,
张扬
,
林牧春
,
刘孝会
表面技术
doi:10.3969/j.issn.1001-3660.2009.02.019
为实现涂层自修复,制备了聚脲包覆KH560硅烷偶联剂微胶囊.研究了温度、搅拌速度和多元胺种类对微胶囊的形貌、粒径大小、分布状况及囊壁强度等的影响.结果表明:在25℃制备的微胶囊为囊泡结构的大粒径微胶囊,在5℃下制备的为小粒径的微胶囊;随搅拌速度的提高,微胶囊的粒径下降,分布变窄;采用三乙烯四胺制备的微胶囊强度高.在5℃下以2 000r/min的速度乳化,采用三乙烯四胺和TDI的三聚体制备的微胶囊是适用于自修复材料的微胶囊.
关键词:
自修复
,
界面聚合
,
聚脲
,
微胶囊
