Basic Info.
Product Description
SGJ Silver Copper Eutectic Alloy Ag72Cu28 Brazing Wire
Silver/Ag based brazing filler metal
Ag72Cu28 Brazing Alloy Soldering Wire
Silver/Ag based brazing filler metal is a solder with silver solid solution, copper solid solution or Ag+Cu phase as the main body. It has excellent process performance, suitable melting point, good wettability and joint filling performance, high mechanical strength, good plasticity and excellent conductivity of brazing joints. It can be used to braze ferrous and non-ferrous metals, such as copper alloys and titanium alloys.Stainless steel, carbon steel, hard alloy and other materials. It is widely used in refrigeration, lighting, mechanical appliances, instrumentation, cutting tools, aerospace and other industries. Generally, in addition to brazing in a vacuum furnace or in a shielding gas, silver flux is required to obtain an excellent brazing joint.
| Ag% | Cu% | Zn% | Melting Point-ºC | Diameter-mm |
| 72 | 28 | - | 779-779 | 0.08~6 |
| 50 | 50 | - | 779-850 | 0.1~3.0 |
| 45 | 30 | 25 | 660-72 | 0.1~6 |
Cu based brazing filler metal are composed of copper as the base and elements that can lower the melting point and improve its overall performance, such as P, Ag, Zn,Sn, Mn, Ni, Co, Ti, Si, B, Fe, etc., mainly pure copper, copper phosphorus, copper tin, copper zinc, copper manganese and other series. Cu based brazing filler metal are widely used in the brazing of copper and copper alloys, carbon steel and cast iron, stainless steel, high-temperature alloys, cemented carbide, etc., with good electrical conductivity, thermal conductivity, and better strength and corrosion resistance, etc.
Typical Grades
| GB/AWS/ISO | Chemical composition (wt%) | Range of melting temperature (ºC) | Minimum brazing temperature (ºC) |
| BCu100/BCu-1 | Cu≥99.9 | 1083 | 1093-1149 |
| CuSn10 | Sn9-11/Cu BAL. | 840-1000 | 1020-1090 |
| CuSn19Ti10 | Sn18-20/Ti9-11/Cu BAL. | 850-880 | 880-930 |
| BCuP-2/BCu92P | P7.0-8.1/Cu BAL. | 710-770 | 720-843 |
| CuSn3P7 | P6-8/Sn2-4/Cu BAL. | 630-670 | 710-810 |
| BCuP-9/BCu86SnP | P6-7/Sn6-7/Cu BAL. | 650-700 | 700-810 |
| BCuP-8/BCu76AgP | Ag17.2-18/P6-6.7/Cu BAL. | 643-666 | 670-686 |
| BCu86SnPNi | P4.8-6.5/Sn7-8/Ni0.5-1.5/Cu BAL. | 612-682 | 682-812 |
| CuSn15.6PNi4.2 | P5.2/Sn15.6/Ni4.2/Cu BAL. | 585-605 | 605-800 |
| Cu595/BCu84NiMn | Mn11-13/Ni2-4/Cu BAL. | 970-990 | 1000-1050 |
| CuMn38Ni10 | Mn37-39/Ni9-11/Cu BAL. | 900-950 | 950-1070 |
| BCuMnCo | Mn9-11/Co2-4/Cu BAL. | 980-1030 | 1050-1100 |
| BCu54Zn | Cu53-55/Zn BAL. | 885-888 | 910-955 |
| Cu773/BCu48ZnNi | Cu46-50/Ni9-11/Zn BAL. | 890-920 | 938-982 |
| Cu55ZnNiMn | Cu54-56/Ni6-8/Mn4-6/Zn BAL. | 910-933 | 940-1040 |
| GB/AWS/ISO | Chemical composition (wt%) | Range of melting temperature (ºC) | Minimum brazing temperature (ºC) |
| BNi73CrFeSiB(c)/BNi-1 | Cr13-15/Si4-5/Fe4-5/B2.75- 3.5/C0.6-0.9/Ni BAL. | 980-1060 | 1066-1204 |
| BNi74CrFeSiB/BNi-1a | Cr13-15/Si4-5/Fe4-5/B2.75-3.5/C0.06/Ni BAL. | 980-1070 | 1077-1204 |
| BNi82CrSiBFe/BNi-2 | Cr6-8/Si4-5/Fe2.5-3.5/B2.75-3.5/Ni BAL. | 970-1000 | 1010-1177 |
| BNi92SiB/BNi-3 | Si2.75-3.5/B4.0-5.0/Ni BAL. | 980-1040 | 1010-1177 |
| BNi95SiB/BNi-4 | Si3-4/B1.5-2.2/Fe≤1.5/Ni BAL. | 980-1070 | 1010-1177 |
| BNi71CrSi/BNi-5 | Cr18.5-19.5/Si9.75-10.5/Ni BAL. | 1080-1135 | 1149-1204 |
| BNi-5x | Cr28.5-29.5/Si3.5-4.5/P5.5-6.5/Ni BAL. | 965-1035 | 1050-1125 |
| BNi89P/BNi-6 | P10-12/Ni BAL. | 875 | 927-1093 |
| BNi76CrP/BNi-7 | Cr13-15/P9.7-10.5/Ni BAL. | 890 | 927-1093 |
| BCo-1 | Ni16-18/Cr18-20/Si7.5-8.5/ W3.5-4.5/B0.7-0.9/C0.35-0.45/Co BAL. | 1121-1149 | 1149-1232 |
| GB/AWS/ISO | Chemical composition (wt%) | Range of melting temperature (ºC) | Minimum brazing temperature (ºC) |
| BAg100/BVAg-0 | Ag≥99.95 | 961 | 961-1038 |
| BAg72Cu/BAg-8 | Ag71-73/Cu BAL. | 779 | 779-899 |
| BAg92Cu | Ag91-93/Cu BAL. | 779-872 | 871-982 |
| BAg45CuZnSn/BAg-36 | Ag44-46/Cu26-28/Zn23-2 7/Sn2.5-3.5 | 646-677 | 677-813 |
| BAg56CuZnSn/BAg-7 | Ag55-57/Cu21-23/Zn15-1 9/Sn4.5-5.5 | 618-652 | 652-760 |
| BAg25CuZnSn/BAg-37 | Ag24-26/Cu39-41/Zn31-3 5/Sn1.5-2.5 | 688-779 | 779-885 |
| BAg50ZnCuNi/BAg-24 | Ag49-51/Cu19-21/Zn26-3 0/Ni1.5-2.5 | 660-707 | 707-843 |
| Ag43.6CuInTi | Ag43.6-Cu29.1-In24.3-Ti 3 | 540-650 | 680-800 |
| AgCuTi4.5 | Ag68.7-70.7/Ti4-5/Cu BAL. | 770-810 | 830-930 |
| AgCuTi2 | Ag68.7-70.7/Ti1.5-2.5/Cu BAL. | 780-805 | 825-927 |
| AgCuTi3.3 | Ag68.7-70.7/Ti2.8-3.8/Cu BAL. | 780-810 | 850-930 |
OFHC (Oxygen-Free High Thermal Conductivity) Copper is the highest purity grade of copper, about 99.99%. Often used as a conductor of electricity.
CTU1 is one of them, which has better forming, resistance to hydrogen embrittlement, and brazing characteristics than C110 ETP. CTU1/C102 has good solderability and corrosion resistance and is used for high current applications. It also has another characteristic, that is, after special treatment can be welded with ceramic.
High Conductivity (OFHC) Copper characteristics are high ductility, high electrical and thermal conductivity, high impact strength, good creep resistance, ease of welding, and low volatility under high vacuum. Electrical: Electrical Conductors, Klystrons, Microwave Tubes, Transistor Components, Lead In Wire, Coaxial Cables, Copper to Glass Seals in Electronic Appliances, Busbars, Bus Conductors, Wave Guides. Industrial: Tubing, LP Gas Service, Tubing, Medical Gas- Oxygen, Vacuum Seals, Coaxial Tube, Billet Mold Tube, Extrusion Cans for Powder Metallurgy
Brazing Al2O3 ceramics and non-oxygen copper with Ag(72)-Cu(28) brazing filler materials added element Ti, we can get high quality brazed joints, and the highest sealing strength can be up to 103 Mpa
The compound line of fixed expansion to high conduction of electricity and high conduction of heat is a kind of compound sealing material that is made of alloy Fe-Ni or Fe-Ni-Co or Fe-Cr and oxygen-free copper.
| Item | Parts | Materials | Note |
| A | Ceramic Tube | 96% alumina | Ends metalizing thin layer of Molybdenum |
| B | Metal Adapter | Kovar 4J33 | JIS Code KV-4(Ni33Co17) |
| C | Electrode | OFHC Copper | Oxygen Free High CondCodeuctivity Copper |
| D | Weld Lip | Kovar 4J33 | JIS Code KV-4(Ni33Co17) |
| X | Brazing Area | Silver+Copper Eutectic Alloy | Complete vacuum brazing |
SGJ Ceramic Metal Seal Assemblies Electrode/ Insert/ Conductor/ Insert/ Connecter Vacuum Feedthrough
Designed Water Cooled Feed Through by SGJ-International (Shaanxi Sgj International Co., Ltd.)
| Code | Parts | Materials | Note |
| A | SS Adapter | SS 304 | Stainless Steel 304 Coated with Nickel |
| B | Sleeve | Kovar 4J33 | JIS Code KV-4(Ni33Co17) |
| C | Ceramic Tube | 96% alumina | Ends metalizing thin layer of Molybdenum |
| D | Cap | Kovar 4J33 | JIS Code KV-4(Ni33Co17) |
| E | Electrode | OFHC Copper | Oxygen Free High Conductivity Copper |
| X | Brazing Area | Silver+Copper Eutectic Alloy | Complete vacuum brazing |
Electrical isolators, consist of metal sleeves brazed to each end of an insulating ceramic tube. They are used to introduce cryogenic fluids into a system and to provide electrical isolation of line components. Vacuum isolators are used to provide an electrical break between the vacuum system and other external components.
SGJ isolators typically are made from high-purity alumina ceramics and Metals. The metal hardware is generally a controlled-expansion Kovar 4J33, SUS 304 or OFHC Copper TU1. All materials and braze alloys used are chosen for their specific characteristics and ability to maintain the integrity of the seals for use in demanding applications and environments. The assemblies are brazed together with Silver Copper Eutectic Alloy.
Designed Electrical Isolator by SGJ-International (Shaanxi Sgj International Co., Ltd.)
Kovar Alloy 4J33:
Kovar is a Nickel-Iron-Cobalt, controlled expansion alloy. It's expansion characteristics match alumina ceramics. This alone ensures it is a highly popular controlled expansion alloys for hermetic sealing applications (Mainly used in Ceramic Metal Seal Assemblies)
OFHC Copper TU1:
CTU1/C102 is an oxygen-free copper which has better forming, resistance to hydrogen embrittlement, and brazing characteristics than C110 ETP. CTU1/C102 has good solderability and corrosion resistance and is used for high current applications.
Stainless Steel SUS 304L:
SUS 304L Stainless Steel famous for its resistivity, fall under the category of Stainless Steel Tubes. Threaded, Hot Rolled, Cold Rolled, Heat Exchangers, Annealed, Pickled.... All these products belonging to the SUS 304L Tubes catalog serve as the prime building blocks of electrochemical, shipping, construction and gas industries.
Metallized Alumina Ceramic:
Vacuum brazing of ceramic and metal requires metal coating in the welding area of ceramic. It ensures good air tightness of metal and alumina metallized ceramic brazing joint in vacuum environment. We SGJ have our own unique patented solder formula to ensure the stability and reliability of our products...
The key of Ceramic-Metal structure based on the vacuum tightness, so called sealing. And , Metallized ceramic bonding area Via vacuum brazing technology is the only solution
Alumina Manufacturing Description:
Alumina Ceramics can be produced in a wide range of purities with additives designed to enhance its properties. Typical purities range from 85 to 99.7% although Precision Ceramics generally work over 99.7% material.
It can be injection molded, die pressed, isostatically pressed, slip cast and extruded. Once fired and sintered, it can only be machined using diamondgrinding methods but prior to sintering advanced green and biscuit machining techniques developed by Precision Ceramics allow more complex components to be manufactured using traditional machining methods. In addition Alumina can be readily joined to metals or other ceramics using metallising and brazing techniques.
Alumina can be machined in green, biscuit, or fully dense states. While in the green or biscuit form it can be machined relatively easily into complex geometries. However, the sintering process that is required to fully densify the material causes the alumiuna body to shrink approximately 20%. This shrinkage means that it is impossible to hold very tight tolerances when machining alumina pre-sintering. In order to achieve very tight tolerances, fully sintered material must be machined/ground with diamond tools. In this process a very precise diamond coated tool/wheel is used to abrade away the material until the desired form is created. Due to the inherit toughness and hardness of the material, this can be a time consuming and costly process.
Precision Ceramics specialises in tight tolerance, highly complex work and has extensive in-house machining facilities - including 4th & 5th axis machining centres, drilling, grinding, milling, polishing, sawing, tapping, threading and turning - to enable us to manufacture Alumina components to the highest specifications.
Precision Ceramics is your Alumina machining specialist for your technical ceramic prototyping & manufacturing needs; we are always happy to use our many years of advanced ceramics experience to provide advice on materials, design, and application. If you would like to buy Alumina plates, rods, tubes or custom machined components, please contact SGJ for more details.
Alumina Electrical Ceramics
Alumina electrical ceramics have low dielectric constant, low dielectric loss, high insulation strength, high volume resistivity, good bending strength, high stability, high compressive strength and good cold and hot shock resistance. It is widely used in temperature controller, insulation parts, thermal equipment, electric heating equipment, iron structure building, shipbuilding and so on. Alumina is the most cost effective and widely used material in the family of engineering ceramics. Extremely High Purity, Temperature & Strength; Excellent Corrosion, High Strength, Wear Resistant, Electronic Insulating, Structural & Metalizing, Porous, Easily Degassed & Machinable. The raw materials from which this high-performance technical grade ceramic is made are readily available and reasonably priced, resulting in good value for the cost in fabricated alumina shapes.
Glazed Alumina Ceramics is a kind of material based on alumina, which is used in thick film integrated circuits. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. Alumina ceramics are widely used. Because of its superior performance, it has been widely used in modern society to meet the needs of daily use and special performance.
SGJ 96% alumina is an easily metallisable ceramic composition:
This material SGJ 96% alumina material is an excellent electrical insulator that can be metallised to facilitate high-temperature brazing of assemblies. This material features:
- Very high volume resistivity
- Low loss, constant high dielectric
- High density, non-porous and vacuum tight
- Resists abrasive wear and chemical attack
The fact that this material can be metallised makes this a good choice for many ceramic to metal or brazed assemblies such as high-vacuum systems, laser equipment (gas, solid-state and waveguide), X-ray tubes and electron microscopes, microwave windows and insulators in medical and scientific equipment.
SGJ 96% Alumina Ceramic Data Sheet:
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