Vacuum Brazing Porous W and Mo Using Ti-Ni-Nb Braze Alloys

2011 ◽  
Vol 410 ◽  
pp. 187-190 ◽  
Author(s):  
C.C. Lin ◽  
Chun Chen ◽  
Ren Kae Shiue ◽  
H.J. Shy ◽  
C.Steve Chang
Keyword(s):  
Melting Point ◽  
Low Temperature ◽  
Braze Alloy ◽  
Ternary Alloys ◽  
Vacuum Brazing ◽  
Novel Approach ◽  
Ni Addition ◽  
Point Depressant ◽  
Melting Point Depressant ◽  
Filler Metals

A novel approach of brazing porous W and Mo using three clad Ti-Ni-Nb foils has been performed in the experiment. Clad Ti-Ni-Nb filler foils are featured with low brazing temperature of below 1350°C. Both W and Mo are completely soluble with β-Ti and Nb, and the Ni addition into the braze alloy is served as a melting point depressant (MPD). Decreased brazing temperature and/or time are necessary in order to minimize infiltration of the molten braze into the porous W substrate. According to the experimental results, Ti-Ni-Nb ternary alloys are promising filler metals in low-temperature brazing porous W and Mo.

Wide Gap Brazing of IN 738 With Boron Free Ni-Co-Zr-Hf-Cr-Ti-Al Braze Alloy

2014 ◽  
Author(s):  
Xiao Huang
Keyword(s):  
Melting Point ◽  
Braze Alloy ◽  
Microstructure Analysis ◽  
Process Conditions ◽  
Limited Effect ◽  
Point Depressant ◽  
Powder Particles ◽  
Filler Powder ◽  
Wide Gap ◽  
Melting Point Depressant

In this study, a new boron and silicon free braze alloy, based on Ni-Co-Zr-Hf-Cr-Ti-Al, was used to repair IN 738 superalloy employing a wide gap brazing (WGB) process under two process conditions. It was found that using a combination of Hf and Zr primarily as melting point depressants the amount of each melting point depressant (MPD) could effectively be reduced while still achieving a relatively low liquidus. During WGB process, the new braze alloy was able to bond IN 738 filler powder particles to each other and to the substrate cast IN 738 and achieve defect free joint. The microstructure analysis showed the presence of Zr-containing phase(s) remained in WGB joint, however, the hardness of the Zr-containing phase(s) was similar to that of superalloy substrate. Extended brazing cycle had limited effect on reducing the Zr-containing phase(s); rather it encouraged the formation of larger eutectic γ/γ′ phases.

Use of Computational Thermodynamics in Rapid Prototyping and Infiltrating Steel Parts

2004 ◽  
Vol 860 ◽  
Author(s):  
Brian D. Kernan ◽  
Emanuel M. Sachs ◽  
Samuel Allen
Keyword(s):  
Melting Point ◽  
Rapid Prototyping ◽  
Design Method ◽  
Tool Steels ◽  
Computational Thermodynamics ◽  
Point Depressant ◽  
Lower Melting Point ◽  
Melting Point Depressant ◽  
Manganese Steels ◽  
Conventional Tool

ABSTRACTThe direct manufacture of metal parts by rapid prototyping often involves building a porous skeleton from a metal powder. In this work, a method termed Homogeneous Steel Infiltration has been developed for infiltrating steel skeletons to make conventional tool steel alloys. The method uses a gated infiltration route that uses as the infiltrant a steel alloy with a lower melting point than the base powder. The infiltrant liquid may use carbon and/or silicon as a melting point depressant. Premature freeze-off of the steel infiltrant is avoided by operating at a temperature where some liquid is stable at chemical equilibrium. The compositions of the skeleton and infiltrant and the infiltration temperature are selected by using computational thermodynamics. Examples of successful infiltrations using D2 and A3 tool steels as target compositions are shown. The thermodynamic design method enables suitable parameters to make other tool steels, some stainless steels and manganese steels.

Effect of Tin Content on the Microstructure and Property of Brazed WC-Co/CrMo Alloy Steel Joints

2008 ◽  
Vol 47-50 ◽  
pp. 596-599
Author(s):  
Hsin Fu Wang ◽  
Liu Ho Chiu ◽  
Heng Chang
Keyword(s):  
Shear Strength ◽  
Braze Alloy ◽  
Alloy Layer ◽  
Vacuum Brazing ◽  
Cu Alloy ◽  
Brazed Joints ◽  
Tin Content ◽  
Steel Joints ◽  
Filler Metals ◽  
Maximum Shear Strength

Vacuum brazing of Cemented Tungsten Carbide (WC-Co) and JIS SCM440 steel using Cu-Sn braze alloy has been studied. The effect of Sn content in the filler metals on the properties of brazed joints was investigated. The specimens were brazed under 1050°C to 1110°C for 5 to 15 minutes. The experimental results show that the maximum shear strength is 341±15MPa for the joints brazed at 1080°C for 10 min by using Cu-9Sn filler. Shear strength of the joints brazed at 1050°C and 1080°C increased as Sn content added to the braze alloy. However, joints brazed at 1110°C showed a decline in shear strength as the increase of Sn content. From SEM micrographs, a Fe-Co-Cu alloy layer was formed at WC-Co/Cu-Sn interface and the property of the layer was affected by brazing temperature and Sn content.

scholarly journals Effect of Bonding Temperature on Microstructure Evolution during TLP Bonding of a Ni3Al based Superalloy IC10

2018 ◽  
Vol 206 ◽  
pp. 03004 ◽  
Author(s):  
Xiong Yue ◽  
Fengmei Liu ◽  
Hexing Chen ◽  
Di Wan ◽  
Hongbo Qin
Keyword(s):  
Melting Point ◽  
Liquid Phase ◽  
Base Metal ◽  
Microstructure Evolution ◽  
Solidification Rate ◽  
Bonding Temperature ◽  
Transient Liquid Phase ◽  
Tlp Bonding ◽  
Point Depressant ◽  
Melting Point Depressant

Transient liquid phase (TLP) bonding of Ni3Al-based superalloy IC10 was carried out using the interlayer based on the base metal which added B and Hf as the melting point depressant elements. The effect of bonding temperature (1250 – 1270 °C) on the microstructure evolution of bonding joints were investigated. Microstructure of bonding joint composed of isothermally solidification zone (ISZ) formed γ’ phase and athermally solidified zone (ASZ) which consists of newly formed γ+γ’ reticular eutectic among with borides and carbides. Boride precipitates are not formed in diffusion affected zone (DAZ) and the boundary between ASZ and ISZ become not obvious. Isothermally solidification rate decreases as the increase of the bonding temperature.

Facile synthesis of high‐melting point spherical TiC and TiN powders at low temperature

2019 ◽  
Vol 103 (2) ◽  
pp. 889-898 ◽  
Author(s):  
Maoqiao Xiang ◽  
Miao Song ◽  
Qingshan Zhu ◽  
Chaoquan Hu ◽  
Yafeng Yang ◽  
...  
Keyword(s):  
Melting Point ◽  
Low Temperature ◽  
High Melting ◽  
High Melting Point ◽  
Facile Synthesis

Preparation of n-Alkylacrylate and Vinyl Acetate Copolymer and Its Influence on Low-Temperature Fluidity of Diesel Fuel

2011 ◽  
Vol 236-238 ◽  
pp. 708-714 ◽  
Author(s):  
Hong An ◽  
Shu Gang Gao ◽  
Shuang Li ◽  
Yan Xin Xie
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
Vinyl Acetate ◽  
Diesel Fuel ◽  
Mass Fraction ◽  
Raw Materials ◽  
Cold Filter Plugging Point ◽  
Point Depressant ◽  
Petrochemical Company ◽  
Acetate Copolymer

The n-tetradecylacrylate-vinyl acetate copolymer (PPV) was prepared from n-tetradecylacrylate and vinyl acetate. The PPV was employed as pour point depressant to improve the low-temperature fluidity of the -20# diesel from Daqing Petrochemical Company. The result indicated that the solidification (SP) and the cold filter plugging point (CFPP) were affected largely by PPV. And when mass fraction of PPV -14(copolymerization conditions: 80 °C,w（benzoyl peroxide）1％（total weight of raw materials）, n（vinyl acetate）∶n（n- tetradecanolacrylate） = 4∶1 ) in diesel fuel was 0.1%wt, the SP reduced by 15.0 °C, the CFPP reduced by 6.0 °C simultaneously; We analysise the different molecular weight of PPV-14, and discover that the molecular weight of PPV-14 is ralated to the the low-temperature fluidity of the -20# diesel from Daqing Petrochemical Company. When mass fraction of PPV -14(molecular weight is 15000, distribution coefficient is 3.11) in diesel fuel was 0.1% wt, the SP reduced by 18.0 °C, the CFPP reduced by 7.0 °C, simultaneously.

scholarly journals Brazing of Cemented Carbide Using Ag-based Filler Metals with a Low Melting Point

2011 ◽  
Vol 29 (3) ◽  
pp. 204-209 ◽  
Author(s):  
Shinji YAOITA ◽  
Takehiko WATANABE ◽  
Tomohiro SASAKI
Keyword(s):  
Melting Point ◽  
Cemented Carbide ◽  
Filler Metals
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