MONOBRAZE Fin

A New type Non-Clad fin,which can be instead of Clad-Fin.

  • MONOBRAZE fin can reduce filler material and processing costs;
  • MONOBRAZE fin can provide a metal bonding as conventional clad fin;
  • MONOBRAZE fin can bring benefits of applying the same forming & brazing equipments as conventional clad fin;
  • MONOBRAZE fin has better post-brazed mechanial properties & corrosion resistance than  clad fin

Chemical Composition(unit wt%)

AlloySiFeCuMnMgCrZnTiAL
MB01(CC)1.0-5.0≤0.25≤0.11.0-2.0≤0.05≤0.051.2-1.8≤0.05Rem

UACJ applied patents of MONOBRAZE bonding method,materials, DC bare fin, CC bare fin & heat exchanger using MONOBRAZE fin in China & overseas, only UACJ & DYG can produce MONOBRAZE fin.

Mechanical properties

Alloy    /Pre-brazedPost-brazed
TS(Mpa)YS(MPa)EL.,(%)TS(Mpa)YS(MPa)EL.,(%)
MB01Standard180-220≥160≥0.5
Measured

value

190-210≥185≥2.0155656.7

Post-brazed TS of DYG’s MONOBRAZE fin is higher than that of conventional clad fin (140MPa), 0.07t MONOBRAZE fin can replace 0.08t clad fin.

High temp. sag resistance property

Alloy-temperThickness,mmSag result,mm
MB01-H14

(CC)

0.076.2
0.068.7

Remark: heating condition 600 ℃ × 3min
High temp. sag amount of DYG's MONOBRAZE fin is lower than that of conventional clad fin of the same thickness (15-20mm),therefore shrinkage of core after brazing is small.

Microstructure(pre-brazed)

Intermetallic compoundSection grain size
MB01

0.07t

MB01

0.06t

  • For CC MONOBRAZE fin , Si particles were very small.
  • For CC MONOBRAZE fin , section grain before brazing was very larger.

Microstructure(post-brazed)

Intermetallic compoundSection grain size
MB01

0.07t

MONOBRAZE Fin-5MONOBRAZE Fin-6
MB01

0.06t

MONOBRAZE Fin-7MONOBRAZE Fin-8

  • For CC MONOBRAZE fin , no obvious erosion.
  • For CC MONOBRAZE fin , section grain size after brazing was very larger,no obvious thickness decrease.

Conductivity(post-brazed)

Thickness,mmPost-brazed conductivity,  %IACS
0.0740
0.0640

post-brazed conductivity of DYG's MONOBRAZE fin is equivalent to that of conventional clad fin.

Electric potential(post-brazed)

Thickness,mmPost-brazed electric potential(SCE,mV)
0.07-766
0.06-757

Remark:5% NaCI-Acetic acid,pH3, 25℃

Post-brazed electric potential of MONOBRAZE fin depends on Zn content , Zn content can be adjusted according to the potential requirement of customers.

Section observation of mini-core

MB01

0.07t

MONOBRAZE Fin-9MONOBRAZE Fin-385μmMONOBRAZE Fin-456μm
MB01

0.06t

MONOBRAZE Fin-12MONOBRAZE Fin-378μmMONOBRAZE Fin-14

After brazing , fillet length of mini-core using 0.07t MONOBRAZE fin is longer than that of mini-core using 0.06t MONOBRAZE fin.

Project Text

Condenser brazed with 0.07t MONOBRAZE fin

12T condenser

Core Shrinkage 1mm

16T condenser

Core Shrinkage 1.5mm

20T condenser

Core Shrinkage 1mm

12T condenser

Bonding rate 97%,99%

16T condenser

Bonding rate 100%

20T condenser

Bonding rate 100%

12T condenser

Fillet length 398μm

16T condenser

Fillet length 398μm

20T condenser

Fillet length 373μm

16T conderser

Fin Shape

No obvious erosion

MONOBRAZE Fin-using 0.07t clad fin

Using 0.07t clad fin

MONOBRAZE Fin-using 0.07t MONOBRAZE fin

Using 0.07t MONOBRAZE fin

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