MONOBRAZE Fin

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

MONOBRAZE 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  that of clad fin

Chemical Composition(unit wt%)

Alloy Si Fe Cu Mn Mg Cr Zn Ti AL
MB01(CC) 1.0-5.0 ≤0.25 ≤0.1 1.0-2.0 ≤0.05 ≤0.05 1.2-1.8 ≤0.05 Rem

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-brazed Post-brazed
TS(Mpa) YS(MPa) EL.,(%) TS(Mpa) YS(MPa) EL.,(%)
MB01 Standard 180-220 ≥160 ≥0.5
Measured

value

190-210 ≥185 ≥2.0 155 65 6.7

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-temper Thickness,mm Sag result,mm
MB01-H14

(CC)

0.07 6.2
0.06 8.7

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 compound Section grain size
MB01

0.07t

MONOBRAZE Fin-1 MONOBRAZE Fin-2
MB01

0.06t

MONOBRAZE Fin-3 MONOBRAZE Fin-4

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

Microstructure(post-brazed)

Intermetallic compound Section grain size
MB01

0.07t

MONOBRAZE Fin-5 MONOBRAZE Fin-6
MB01

0.06t

MONOBRAZE Fin-7 MONOBRAZE 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,mm Post-brazed conductivity,  %IACS
0.07 40
0.06 40

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

Electric potential(post-brazed)

Thickness,mm Post-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-9 MONOBRAZE Fin-385μm MONOBRAZE Fin-456μm
MB01

0.06t

MONOBRAZE Fin-12 MONOBRAZE Fin-378μm MONOBRAZE 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

MONOBRAZE Fin-12T condenser

Core Shrinkage 1mm

16T condenser

MONOBRAZE Fin-16T condenser

Core Shrinkage 1.5mm

20T condenser

MONOBRAZE Fin-20T condenser

Core Shrinkage 1mm

12T condenser

MONOBRAZE Fin-12T condenser
MONOBRAZE Fin-12T condenser

Bonding rate 97%,99%

16T condenser

MONOBRAZE Fin-16T condenser

Bonding rate 100%

20T condenser

MONOBRAZE Fin-20T condenser

Bonding rate 100%

12T condenser

MONOBRAZE Fin-12T condenser

Fillet length 398μm

16T condenser

MONOBRAZE Fin-16T condenser

Fillet length 398μm

20T condenser

MONOBRAZE Fin-20T condenser

Fillet length 373μm

16T conderser

MONOBRAZE Fin-16T condenser

Fin Shape

MONOBRAZE Fin-16T condenser

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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