Effect of Surface Modified Foamed Fe Powder on Tribological Properties of Semi-Metallic Friction Material

2013 ◽  
Vol 668 ◽  
pp. 75-79
Author(s):  
Yang Cao ◽  
Yuan Kang Zhou ◽  
Jian Yu Wei ◽  
Tao Yue Yang ◽  
Hua Wei Nie
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Hydrophobic Surface ◽  
Friction Material ◽  
Fe Powder ◽  
Silane Coupling

The silane coupling agent KH550 is used to modify foamed Fe powder(FFP) surface for obtain the hydrophobic surface, which is the very important component in semi-metallic friction material. It can improve high temperature bonding force between FFP and phenolic resin, further improve friction coefficient stableness of friction material and abrasion resistance. The modification effect of FFP is characterized by IR, and the tribological properties is characterized by XD-MSM constant speed friction test machine, the surface topography is characterized by SEM. The results indicate that FFP has been bonded to silane coupling agent, and formed hydrophobic surface what has the alkyl group. The changing of friction coefficient has reduced 23%, the average wear rate has declined 28.6%,and the wear rate has declined 32% at 350 °C after the friction material with modified FFP compare with the one with original FFP. And those changing are all because of the fact that the FFP modified by KH550 is difficult to peel off during the high temperature.

Fundamental Study on Adhesion of Epoxy Underfill Materials with Passivation Layer in Flip-chip Packaging

2001 ◽  
Vol 682 ◽  
Author(s):  
Shijian Luo ◽  
C. P. Wong
Keyword(s):  
High Temperature ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Flip Chip ◽  
Polymer Chains ◽  
Passivation Layer ◽  
High Humidity ◽  
Fundamental Study ◽  
Silane Coupling ◽  
Flip Chip Packaging

ABSTRACTThe influence of aging in an environment with a high temperature and a high humidity on the adhesion performance of underfill material (epoxy cured with acid anhydride) to the passivation layer in flip chip packaging is discussed. Adhesion of underfill to different passivation materials degrades after aging in a high temperature and high humidity environment. The extent of this degradation is dependent on the hydrophilicity of the passivation material. Hydrophilic passivation such as silicon oxide (SiO2) and silicon nitride (Si3N4) shows much more severe adhesion degradation than hydrophobic passivation such as benzocyclobutene (BCB) and polyimide (PI). The mobility of absorbed water and of polymer chains is studied with solid state nuclear magnetic resonance (NMR) spectroscopy. Higher mobility of absorbed water and of polymer chains in rubbery state polymers contributes to faster adhesion degradation during high temperature and high humidity aging. The adhesion stability of hydrophilic passivation can be successfully improved by use of a silane coupling agent that introduces stable chemical bond at interface. A flow micro-calorimeter was used to study the absorption of silane coupling agent onto glass surface. The difference in adhesion retention improvement between aminosilane and epoxysilane is discussed.

scholarly journals A cement paste–tail sealant interface modified with a silane coupling agent for enhancing waterproofing performance in a concrete lining system

RSC Advances ◽  
2019 ◽  
Vol 9 (13) ◽  
pp. 7165-7175 ◽  
Author(s):  
Fan Li ◽  
Yuyou Yang ◽  
Mingjiang Tao ◽  
Xiangqian Li
Keyword(s):  
Cement Paste ◽  
Coupling Agent ◽  
Surface Coating ◽  
Silane Coupling Agent ◽  
Hydrophobic Surface ◽  
Concrete Lining ◽  
Underground Structures ◽  
System P ◽  
Silane Coupling

Although hydrophobic surface coating of concrete is currently used to enhance waterproofing performance of underground structures, the chemical and mechanical incompatibility between them is a challenge to ensure long-term waterproofing properties.

Surface Hydrophilic Modification of Polypropylene Fiber by Hydrolysis of Silane Coupling Agent

2018 ◽  
Vol 779 ◽  
pp. 80-85
Author(s):  
Yi Wei Fei ◽  
Jun Ma ◽  
Shian Sun ◽  
Li Ping Tong ◽  
Hong Ming Liu
Keyword(s):  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Polypropylene Fiber ◽  
Hydrophobic Surface ◽  
Interface Bonding ◽  
Hydrophilic Modification ◽  
Modification Process ◽  
Silane Coupling ◽  
Ft Ir ◽  
Hydrolysis Of

Silane coupling agent is applied to modify polypropylene fiber. The modification effectively transfers the hydrophobic surface of polypropylene fiber to hydrophilic surface. Results from FT-IR, SEM and contact angle meter suggest that that the surface functional groups, the morphology and hydrophilia of polypropylene fiber is changed during the hydrolysis reactions of silane coupling agent. The modification process not only improve the surface hydrophilia of polypropylene fiber, but also convert the smooth surface of unmodified fibers to rough surface of modified fibers which gives stronger interface bonding force between fiber and substrate in the field of composite applications.

Study on the Anti-Oxidant Property of Copper Powder Coated Silane Coupling Agent in Isotropically Conductive Adhesives

2010 ◽  
Vol 139-141 ◽  
pp. 117-120 ◽  
Author(s):  
Jian Hua Zhong ◽  
Zhi Hong Li ◽  
Ling Yu Ouyang
Keyword(s):  
High Temperature ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Thermo Gravimetric Analysis ◽  
Accelerated Aging ◽  
Gravimetric Analysis ◽  
Conductive Adhesives ◽  
Copper Powders ◽  
Silane Coupling ◽  
Anti Oxidant

In this experiment, the micro copper powders with high temperature of oxidation resistance were prepared by coating with 2 wt.% of silane coupling agent(KH560) solution in order to protect them from oxidation in isotropically conductive adhesives, and X-ray diffraction analysis(XRD), thermo gravimetric analysis(TGA) and accelerated aging test were applied to analyze the anti-oxidant property of the samples before and after they were treated. Experimental results showed that the polymer of silane coupling agent on the surfaces of copper powders had high thermal stability exposed under high temperature and was very effective in preventing the copper powders from oxidation in isotropically conductive adhesives. Besides, the epoxy conductive adhesive sample with plated copper as electrically conductive fillers still had good conductive property even exposed at 160 degrees with its bulk resistivity was 8.75×10-3Ω•cm.

Dispersion and Behavior of Silane Coupling Agent to Surface Modification of n-Cu Particles

2010 ◽  
Vol 92 ◽  
pp. 73-78 ◽  
Author(s):  
Xiao Li Wang ◽  
Bo Zhang ◽  
Yang Zhao ◽  
Yi Xu ◽  
Bin Shi Xu
Keyword(s):  
Surface Modification ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Wear Test ◽  
Friction Material ◽  
Test Machine ◽  
Silane Coupling ◽  
Surface Modified ◽  
20 Nm ◽  
And Behavior

The prepared n-Cu particles with the particle size about 20 nm by KBH4 reduction method in aqueous solution was surface modified using silane coupling agent. The surface modification mechanics was researched. The tribological performances of n-Cu particles were tested by friction wear test machine. The results show that the modified n-Cu paritcles by silane coupling agent have high purity, good dispersion performances and wonderful surface activity. In friction process, the modified n-Cu particles can form a layer of organic-inorganic compound film with synergistic effect on worn surface, which improves the tribological performances of friction material.

Tribological Properties Between a-C:H Coatings and SiO2 at High Temperature

2020 ◽  
Author(s):  
Noritsugu Umehara ◽  
Kota Konishi ◽  
Motoyuki Murashima ◽  
Takayuki Tokoroyama
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Wear Track ◽  
Severe Damage ◽  
Friction Test ◽  
Low Friction ◽  
Disk Friction

Abstract Tribological properties of a-C:H coatings has been investigated in various friction conditions. It is clear that temperature and mating materials give effects on tribological properties. In this study, we especially focus on the effect of mating material on its tribological properties of a-C:H coatings. Ball-on-disk friction test is conducted between a-C:H coating and 5 kinds of mating material, which is SiC, SiC(O)_800 (SiC oxidized at 800°C), SiC(O)_1050°C, SiC(O)_1300°C, and Quartz glass. It is found that a-C:H coatings shows low friction coefficient and low specific wear rate when O/Si ratio of the element content of mating material is 2, in other words, mating material is SiO2. In the wear scar of a-C:H coating after friction test with SiC, severe damage was confirmed. It is considered that a-C:H coating and SiO2 show low adhesion even at high temperature, which leads low friction and wear. Compared SiC(O) with Quartz, the friction coefficients with a-C:H coatings are respectively 0.013 and 0.038. Even though SiC(O) and Quartz are both SiO2, the tribological properties are different. On the wear track of SiC(O), transferred things from a-C:H coating are confirmed.

Research on the Performance Influence of Second Adhesive to Friction Materials

2013 ◽  
Vol 461 ◽  
pp. 415-420
Author(s):  
Jie Peng ◽  
Yu Cheng Liu ◽  
Zhi Feng Yan ◽  
Bao Gang Wang ◽  
Fu Dong Lin ◽  
...  
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Friction Material ◽  
Molten State ◽  
Wear Performance ◽  
Friction Materials ◽  
Low Wear ◽  
The One ◽  
Better Than

The friction materials have many species and they are being used widely, but people have higher requests to friction materials along with the development of technology. the friction material of this expermental optimization formula have the advantages of suitable and stable friction coefficient under high temperature, low wear rate, good restoration characteristics and so on. It can effcetively reduce heat fade of friction and wear under high temperature barking. fricton and wear performance of friction material with second adhesive is better than common preparation friction material , it has higher friction coefficient and lower wear rate, It was determined by physical chemical properities of tin and sulfer. while heating or wearing, the temperature of friction material reach melting temperature of tin, it will become molten state, and sulfer has strong oxidation, on the one hand, tin and sulfer occurred chemical reaction, generating sulfide, stannous (one sulfide tin),on the other hand, while the sulfer is being molten state, it will absorb some abrasive dust, at the same time of generating sulfide, abrasive dust will be adsorb and solidify to pits of friction surface, forming abrasive dust membrane, let the friction coefficient of sample become stable rapidly, reducing the wear rate of friction material.

Discussion the Effect on Improving Granite Bituminous Mixture Performance by Adding Coupling Agent

2012 ◽  
Vol 204-208 ◽  
pp. 4115-4118 ◽  
Author(s):  
Ai Qin Zhang ◽  
Yan Min Wang ◽  
Chuan Yi Zhuang
Keyword(s):  
High Temperature ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Asphalt Mixture ◽  
Water Stability ◽  
Bituminous Mixture ◽  
Rutting Resistance ◽  
Silane Coupling

In this paper, improved adhesion of between asphalt and granite and the performance of high temperature and water stability of granite asphalt mixture by the coupling agent were discussed. The results show that the titanate coupling agent and silane coupling agent doped in asphalt can significantly improve the rutting resistance and water stability of the granite asphalt mixture.

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