烧结温度对陶瓷/青铜结合剂性能与显微结构的影响

通过粉末冶金法制备出陶瓷/青铜结合剂,青铜结合剂(mCu∶mSn=85∶15)与陶瓷结合剂质量比3∶1.结合电子万能试验机、洛氏硬度仪、扫描电子显微镜(SEM)、X射线衍射仪等,研究了烧结温度对陶瓷/青铜结合剂性能及结构的影响.结果表明:随烧结温度的升高,陶瓷/青铜结合剂密度、抗折强度和抗冲击强度呈先上升后下降的趋势;且烧结温度为620 ℃时,陶瓷/青铜结合剂综合性能较优,其密度为5.43 g/cm3、抗折强度为170 MPa、抗冲击强度为9.76 kJ/m2、硬度(HRB)为126;温度升高促进铜锡元素合金化及陶瓷与青铜结合剂界面之间元素的相互渗透;且经620 ℃烧结后,铜锡之间全部以α+δ共析相存在,金属和陶瓷界面结合性好,提高了陶瓷/青铜结合剂的综合性能.

Effect of Sintering Temperature on Properties and Microstructure of Ceramic/Bronze Composite Bond

Ceramic/bronze composite bond was prepared by the method of powder metallurgy, and mass ratio of bronze bond (mCu∶mSn=85∶15) to ceramic bond of 3∶1.The influence of sintering temperature on the mechanical properties and structure of ceramic/bronze composite bond were studied though electro-mechanical universal testing machines, rockwell hardness tester, scanning electron microscope (SEM) and X-ray diffraction.The results show that: when sintering temperature arises, the density, bending strength and impact strength of ceramic/bronze composite bond arises first and decreases later.when sintering temperature is 620 ℃, the mechanical properties of ceramic/bronze composite bond reach its maximum, the density is 5.43 g/cm3, the bending strength is 170 MPa, the impact strength is 9.76 kJ/m2 and the hardness (HRB) is 126.The temperature rise promotes Cu and Sn to realize alloyed and also promotes the interaction of the elements of the interface between the bronze and the ceramic.When sintering temperature is 620 ℃, between the copper and tin are all α+δ eutectoid, the interface of metal and ceramic bonded well, which improve the properties of ceramic/bronze composite bond.