钟正祥
,
刘丽
,
彭磊
,
金兆国
,
刘斌
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2015.04.009
采用有机硅树脂掺杂无机粒子制备了一种耐高温腻子(HIT-J01),研究了其粘接性能、膨胀特性和抗热震性能.通过SEM及XRD分析了腻子的微观结构和相变化.结果表明:制备的腻子具有良好的粘接和抗热震性能,粘接C/SiC的单搭接剪切强度为5.5 MPa,1 200℃在线单搭接剪切强度1.8 MPa.腻子同基材C/SiC具有良好的热膨胀匹配性能.HIT-J01腻子在高温条件下生成的Al2O3·(B2O3)n融体.在风洞考核环境下,腻子封堵面平均温度高达1 200℃,最高温度达到1 400℃,风洞实验后,腻子表观平整、无裂纹.
关键词:
耐高温
,
热膨胀
,
风洞考核
,
剪切强度
党旭丹
,
史少杰
,
肖军
机械工程材料
利用有限元软件分析了X-cor夹层结构的剪切强度及失效机理，提出了失效判据和材料刚度退化规则．明确了X-cor夹层结构的失效过程和模式；根据失效判据，采用有限元模型中发生刚度退化的单元及其分布模拟失效类型及扩展路径，说明了X-cor夹层结构的剪切失效机理。结果表明：在剪切载荷下，树脂区首先失效，然后是Z-pin拔出面板、Z-pin被剪断及Z-pin屈曲多重失效模式并存；有限元分析结果与试验数值吻合较好，说明了失效判据和刚度退化规则选择的有效性。
关键词:
X-cor夹层结构
,
剪切强度
,
Z-pin
,
有限元
,
失效判据
,
退化规则
Yuhua Liu
材料科学技术（英文）
Polycrystalline ZrO2-3 mol.%Y2O3 was brazed to Ti-6Al-4V by using a Ti47Zr28Cu14Ni11(at.%) amorphous ribbon at 1123-1273 K in a high vacuum. The influences of brazing temperature on the microstructure and shear strength of the joints were investigated. The interfacial microstructures can be described as ZrO2/TiO+TiO2+Cu2Ti4O+Ni2Ti4O/α-Ti+(Ti,Zr)2(Cu,Ni) eutectic/acicular WidmanstÄaten structure/Ti-6Al-4V alloy. With the increase in the brazing temperature, the thickness of the TiO+TiO2+Cu2Ti4O+Ni2Ti4O layer reduced, the content of the α-Ti+(Ti,Zr)2(Cu,Ni) eutectic phase decreased, while that of the coarse α-Ti phase gradually increased. The shear strength of the joints did not show a close relationship with the thickness of the TiO+TiO2+Cu2Ti4O+Ni2Ti4O layer. However, when the coarse (Ti,Zr)2(Cu,Ni) phase was non-uniformly distributed in the α-Ti phase, or when α-Ti solely situated at the center of the joint, forming a coarse block or even connecting into a continuous strip, the shear strength greatly decreased.
关键词:
Brazing
Yuhua LIU
金属学报(英文版)
A commercially available Ti47Zr28Cu14Ni11 (at. pct) amorphous filler foil was used to join ZrO2 ceramic and Ti-6Al-4V alloy. According to experimental observations, the interface microstructure accounts for the mechanical properties of the joints. The effects of brazing conditions and parameters on the joint properties were investigated. The joint shear strength showed the highest value of about 108 MPa and did not monotonously increase with the brazing time increasing. It was shown that decreasing of brazing cooling rate and appropriate filler foil thickness gave higher joint strength.
关键词:
Brazing
Jianguo YANG
,
Hongyuan FANG
,
Xin WAN
材料科学技术（英文）
Al2O3/Al3O3 joints were brazed with a new kind of filler materials, which were formed by adding Al2O3 particulates into Ag-Cu-Ti active filler metal. The results showed that the material parameters (the Ti content, Al2O3 particulate volume fraction) of the composite filler materials affected the shear strength of brazed joints. When the Ti content was 2 wt pct in the filler metal, the shear strength of brazing joints decreased with the increasing the volume ratio of Al2O3 particulate. When the Ti content was 3 wt pct in the filler metal, the shear strength of joints increased from 93.75 MPa(Al2O3p 0 vol. pct) to 135.32 MPa(Al2O3p 15 vol. pct).
关键词:
Composite filler material
,
null
,
null
,
null
Yuhua Liu
材料科学技术（英文）
Polycrystalline ZrO2-3 mol.%Y2O3 was brazed to Ti-6Al-4V by using a Ti47Zr28Cu14Ni11(at.%) amorphous ribbon at 1123-1273 K in a high vacuum. The influences of brazing temperature on the microstructure and shear strength of the joints were investigated. The interfacial microstructures can be described as ZrO2/TiO+TiO2+Cu2Ti4O+Ni2Ti4O/α-Ti+(Ti,Zr)2(Cu,Ni) eutectic/acicular WidmanstÄaten structure/Ti-6Al-4V alloy. With the increase in the brazing temperature, the thickness of the TiO+TiO2+Cu2Ti4O+Ni2Ti4O layer reduced, the content of the α-Ti+(Ti,Zr)2(Cu,Ni) eutectic phase decreased, while that of the coarse α-Ti phase gradually increased. The shear strength of the joints did not show a close relationship with the thickness of the TiO+TiO2+Cu2Ti4O+Ni2Ti4O layer. However, when the coarse (Ti,Zr)2(Cu,Ni) phase was non-uniformly distributed in the α-Ti phase, or when α-Ti solely situated at the center of the joint, forming a coarse block or even connecting into a continuous strip, the shear strength greatly decreased.
关键词:
Brazing
M.Naka
,
Jie ZHANG
,
Yu ZHOU
材料科学技术（英文）
Si3N4 ceramic was jointed to itself using a filler alloy of Cu76.5Pd8.5Ti15, and the mechanical properties of the joint were measured and analyzed. By using a filler alloy of Cu76.5Pd8.5Ti15, the Si3N4/ Si3N4 joints were obtained by brazing at 1373～1473 K for 0.9～5.4 ks under a pressure of 2×10-3 MPa. The effect of brazing parameters on the shear strength of the joint was investigated. When the brazing temperature and holding time is 1423 K and 5.4 ks respectively, the maximum shear strength of the Si3N4/Si3N4 joint is obtained to be 198 MPa.
关键词:
Si3N4 ceramic
,
null
,
null
,
null
