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%)

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

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

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

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

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 compound

Section grain size

MB01

0.07t

MB01

0.06t

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