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SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 BRAZING FLUX STUDIES INTERNATIONAL BRAZING AND SOLDERING CONFERENCE ALBUQUERQUE, NEW MEXICO / APRIL.

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Presentation on theme: "SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 BRAZING FLUX STUDIES INTERNATIONAL BRAZING AND SOLDERING CONFERENCE ALBUQUERQUE, NEW MEXICO / APRIL."— Presentation transcript:

1 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 BRAZING FLUX STUDIES INTERNATIONAL BRAZING AND SOLDERING CONFERENCE ALBUQUERQUE, NEW MEXICO / APRIL 4, 2000 s s Presented By: Dr. Y. Baskin Superior Flux & Manufacturing Company Cleveland, Ohio

2 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 PURPOSE s To study the effects of time, temperature, and flux formulation on activation and exhaustion temperatures, which determine flux activity ranges. The role of several different base metals and filler metals was also studied

3 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 EQUIPMENT s Thermolyne 1500 Furnace - Maximum Temperature 1300° C s 30 Tempilstik Temperature Indicators - 400° ° C s Calibrated Pyrometer with Surface Probe s Timer s Balance

4 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 BASE METALS s Mild Steel s Stainless Steel 316 s Copper s Brass (70% Copper, 30% Zinc)

5 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 FILLER METALS Bag-1 s Composition: 45% Silver, 15% Copper, 16% Zinc, 24% Cadmium Melting Point: 618° C Braze Bag-21, SAE-AMS 4774 s Composition: 63% Silver, 28.5% Copper, 6% Tin, 2.5% Nickel Melting Point: 690° C High-Temp 095, SAE-AMS 4764 s Composition: 52.5% Copper, 38% Manganese, 9.5% Nickel Melting Point: 875° C

6 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 FLUXES s Boric Acid s Potassium Tetraborate s Potassium Fluoborate s Potassium Carbonate s Potassium Fluroide s Potassium Bifluoride s Sodium Tetraborate (Borax) s Silica s Potassium Pentaborate Fifteen fluxes were used, including existing products and experimental, formulations. Compositions included the following raw materials:

7 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 FLUX COMPOSITIONS IN THE PSEUDO TERNARY K-B-F Atomic Percent Boron (Silicon Atomic Percent Fluorine Atomic Percent Potassium (Sodium)

8 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 FURNACE CALIBRATION/ PYROMETER BASE METALS: MILD STEEL SOAK TIME: 40 SECONDS Pyrometer Temperature (°C) Furnace Temperature (°C)

9 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 FURNACE CALLIBRATION PYROMETER MILD STEEL/ 40 SECONDS Furnace Temperature (C°) Pyrometer Temperature (C°)

10 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 EFFECT OF TIME ON FLUX ACTIVATION TEMPERATURE/ MILD STEEL Time, Seconds Flux Activation Temperature (C°)

11 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 FLUX ACTIVIATION TEMPERATURE AS A FUNCTION OF B/F RATIO (40 SECOND SOAK TIIME) Temperature (C°) B/F Ratio

12 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 FLUX EXHUSTION TEMPERTURE/ MILD STEEL AND STAINLESS STEEL FluxMild Steel (C°) Stainless Steel (C°) FluxMild Steel (C°) Stainless Steel (C°)

13 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 FLUX EXHAUSTION TEMPERATURE AS A FUNCTION OF B/F RATIO (40 SECOND SOAK TIME) Temperature (C°) B/F Ratio

14 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 CONCLUSIONS s Flux compositions high in boron and low in fluorine generally exhibit better high temperature properties, whereas compositions low in boron and high in fluorine show better and more active low temperature properties, Difference s in raw materials and other chemical factors may account for the departure from a more linear relationship between activation or exhaustion temperature and B/F ratios. s Increased soaking time reduces flux activation temperature.

15 SUPERIOR FLUX & MANUFACTURING COMPANY / APRIL 2000 CONCLUSIONS (Continued) s Neither flux activation temperature nor exhaustion temperature are affected by the base metal used, as long as the stability range of the metal is not exceeded. s Similarly flux exhaustion temperatures are not affected by the filler metal used, as long as the stability of the filler metal is not exceeded.


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