High Temperature Heat Treatment Manufacturer-Cxinduction

Product Description

Brazing in a vacuum furnace is a brazing process in which a brazed workpiece is placed in a vacuum furnace, and the workpiece is in a vacuum state during brazing to avoid oxidation of the base metal, and under high temperature vacuum conditions, The surface oxides of the base material is volatilized at high temperatures, and are eliminated by the vacuum equipment system, and the residual brazing filler metal during brazing is also volatilized by vacuum equipment. Brazing in a vacuum furnace, there is no need to add the brazing flux. Vacuum equipment is composed of mechanical vacuum pump, diffusion pump, vacuum connecting pipe and vacuum butterfly valve and so on. It can improve the vacuum degree of the system and can have a positive effect on the brazing quality. Generally, the vacuum degree of brazing in vacuum furnace is within 1.33 * 10^-1- 1.33 * 10^-3Pa.

Application

It is suitable for brazing the stainless steel and high temperature alloy by using copper and nickel-based brazing filler metal, especially suitable for the high-temperature alloy containing titanium and aluminum; copper, nickel, superalloy and silver-titanium alloy with silver brazing filler metal, and cobalt alloy or a titanium alloy with cobalt-based brazing filler metal, or the like.

Features

The main advantage of brazing in vacuum furnace is that the brazing quality is high, the workpiece is not oxidized, the deformation is small, and it can brazing other materials that cannot be brazed by other brazing method. However, due to the easy evaporation of the metal under vacuum, the brazing should be properly controlled, that is the melting point of the brazing, the melting temperature, the time of infiltration and penetration of the base material. Therefore, it is not advisable to use brazing filler metal with a large content of elements such as zinc, cadmium, manganese, magnesium and phosphorus during brazing, and it is not suitable to use a workpiece containing a large amount of these elements in the base material for brazing in a vacuum furnace.

Technical Data

Model	CX-VBF-600
Type	Horizontal with double doors
Power Supply	3/N/PE AC/380V 50Hz (customized according to your power gird)
Max. Output Power	90 KW (heating 60KW, pump 20KW, others 10KW)
Max. Temperature	1300°C
Max. Continuous Working Temperature	≤1250°C
Temperature Uniformity	±5°C (Empty, Room Temperature Furnace)
Max Heating Rate	≤60 min from Room Temperature to 1200°C，Empty Furnace
Ultimate Vacuum	10-4 pa
Vacuum Chamber Pressure Rise Rate	0.4 Pa/h (Empty, Room Temperature Furnace)
Cooling Method	Natural Cooling

 

Furnace Structure

Vacuum Brazing furnace, model CX-VBF-600 consists of Furnace Body, Heating Chamber, Vacuum System, Gas Charging System, Water Cooling System, Electronic Control and Power Supply System.

1. Furnace Body: consists of furnace shell, furnace door, locking mechanism, furnace support etc. Both the furnace shell and door are double-wall which are made of SUS 304 and have integral water cooling passages. The furnace door is made from double elliptical head and a circular flange by welding, and there is a O-sealing ring on the flange.  The front door is a common work door. The workpiece is loaded and unloaded from the front door. There is a heating chamber,  electrode and exhaust port of the main vacuum pump on the furnace body.

2.Heating Chamber: It is a cylindrical chamber and consists of heating element, heat shield and material table. The heating element is high strength molybdenum wire and insulated by special designed ceramic parts to avoid the shirt circuit caused by welding volatilization. The heating zone can be disassembled separately and it is easy to replace when damaged. The heating power source is connected to heating element through soft copper wire, copper bar, copper electrode. The circuit and furnace body have good insulation performance which is easy to clean, disassemble and replace.

3.Vacuum system: includes a mechanical pump and a diffusion pump. There are vacuum gauge sockets on each valve and pipe. And the vacuum measuring devices are equipped for each pipeline section to facilitate vacuum measurement in each pipeline.

4.Electronic Controlling System:

       4.1 It includes Touch Screen, PLC, Thyristor Voltage Regulator, Vacuum Gauge to achieve the function of power supplying, controlling, recording,  monitoring, alarming and protecting.

       4.2 It achieved high temperature control accuracy by using Germany Siemens PLC and Japanese Shimaden Temperature Controller. Meanwhile, the PLC roundly control the operation of the furnace. According to the process requirements, the sequence control signals are provided, and the feedback signals at the scene are collected to provide conversion, interlocking, indication and alarm signals. In addition to loading and unloading, the entire process can be automated and equipped with a manual operating system.

       4.3 There two pieces of thermocouple to measure the temperature in the furnace and learn the temperature uniformity at any time.

       4.4 The furnace controlling interface is touch screen controlling system. Through the communication with the PLC, the temperature and vacuum curves can be set up and recorded to develop and query the process. The furnace’s running status can be displayed in real time.

       4.5 It has over-temperature and water-breaking safety protection function, and has sound and light alarm system. The furnace body is equipped with safety valve device, and there are interlocking circuits such as air pressure, vacuum degree, water pressure and heating.

       4.6 The heating power supply uses a single-phase thyristor power supply, and is powered by a low voltage and a large current. Heating power 60KVA.

       4.7 There is a fan cooling system in the control cabinet.

5.Water cooling system: the furnace body, furnace door, vacuum unit, water-cooled electrode, heat exchange system of furnace require cooling water. The cooling water is distributed by a manifold to each cooling part, and it is a closed water circulation system. Each cooling pipe is equipped with a water flow observer and is equipped with a water pressure alarm system. There is a branch which is connected to the tap water pipe for emergency use in case of power failure. Both the inlet and outlet pipes are made of stainless steel pipes.

6.Pneumatic system: consists of pneumatic three-piece (water eliminator, pressure gauge, oil mister), electromagnetic reversing valve and pipeline. Provides clean compressed air to pneumatic actuators such as cylinders, inflation valves, vacuum valves, and more.

7.Inflating and partial pressure system: It consists of large-diameter pneumatic shut-off valve, manual stop valve, trimmer valve, and gas collecting pipe. There is a safety bleed valve when the furnace is deflated. And there is a pressure sensor to control the inflation pressure.

8.Workpiece conveying system: material is loaded by pallet or placed on bearing platform.

9. Safety system: The safety system includes water stop, over temperature, heating over flow, fault self-diagnosis, automatic protection, and prevention of misoperation. And with sound and light alarm prompts and with corresponding interlocking, interlock protection.

Product Introduction

 

CX-SCSF series are top loading batch type induction heating furnaces with the maximum operating temperature of 2400°C. These furnaces operate with rough vacuum, partial pressure and micro-positive pressure of protective gases such as Argon and Nitrogen. Oxygen atmosphere is prohibited in these furnaces due to graphite crucible and graphite insulation used inside the furnace.

CX-SCSF series use medium frequency induction heating method, however the resistance heating method is optional in case of client demand. A water cooled induction coil installed inside the furnace. At the center of the coil, there is a graphite crucible as the susceptor for induction current, surrounded by carbon felt as the insulation material. Cylindrical hot zone design ensure uniform heating inside the hot zone.

 

Application

 

These furnaces are suited for silicon carbide sintering, ceramic matrix composite sintering, transparent optical ceramic sintering, C/C composites sintering and carbonization.

 

General Features

 

· Vertical top loading or horizontal front loading with single chamber. The shell and door are water-cooled jacketed. The outer layer of the furnace shell is made of carbon steel while the inner layer is made of SS304 stainless steel. The inner stainless steel wall features long time uses without rusting as well as less adsorption of induction eddy currents in comparison to plain carbon steel.

· Induction coil covered by high quality alumina mortar in order to avoid short circuit between coil and carbon felt.

· High vacuum pneumatic valves equipped with position indicator in order to automatic control of the vacuum and gas supply system.

· Gas flow control system.

· Over-temperature, over-pressure, water lack and power failure alarms and automatic mechanical interlock for over-pressure protection.

· High precision smart temperature controller which can store 20 programs with total 400 segments.

· Sliding thermocouple for low temperature measurement and pyrometer for high temperature measurement, features high precision temperature control from room temperature (RT) to 2400°C.

High temperatures are generally measured using pyrometers and each kind of pyrometer has a limited measuring range, for example 350-2500°C. Therefore, when the furnace start heating from RT, there will be an undefined heating process out of pyrometer measuring range. In some cases, batches are sensitive and require to have a defined heating curve from RT. In these cases, using the Sliding Thermocouple for low temperature stage of heating cycle, and pyrometer for high temperature cycle is very useful. Thermocouple measure temperature from RT to a defined high temperature point. After reaching that point, thermocouple automatically slide out of the hot zone and pyrometer measure temperature. During cooling, after furnace cooled down to that defined temperature, thermocouple automatically return inside the hot zone and regulate temperature down to RT.

· High capability MF contactor for furnace operation switch.

· Fully automatic PLC monitoring system.

· Remote operation, failure diagnosis and software upgrading.

 

Optional Features

 

· High Vacuum System

· Gas Purification System

· Closed Loop Cooling Water System

· Distributed Control System (DCS)

· Double chambers (with only one control cabinet for two chambers)

· Resistance heating instead of induction heating

 

Technical Details of Vertical Top Loading Models

 

                 * CEDRT: Clean, Empty, Dry, Room Temperature Furnace

 

Technical Details of Horizontal Front Loading Models

                * CEDRT: Clean, Empty, Dry, Room Temperature Furnace

 

 

 

 

Product Introduction

 

CX-HSF series sintering furnaces operate with rough vacuum and protective gases such as Argon and Nitrogen. CX-HSF series can’t operate in an oxygen atmosphere due to graphite crucible and graphite insulation used inside furnace.

The horizontal design with double doors at front and back of the furnace, allows for easy loading and unloading. Three different sizes of this furnace are available in CX-Induction and other sizes can be customized according to client’s requirements.

CX-HSF series use resistance heating method. With maximum temperatures up to 1550 °C and fast cooling (quenching) system, CX-HSF series are suited for a range of sintering and heat treatment processes. 

 

Application

 

CX-HSF series sintering furnaces are batch-type resistance heating furnaces which are mainly used for sintering process of cemented carbides, tungsten heavy alloys, stainless steel products, high-temperature alloys, magnetic materials, ceramic powder products, and Carbides etc.

 

General Features

 

· The furnace is horizontal type with single chamber. The shell and door are water-cooled jacketed. Both the outer and inner layer of the furnace shell is made of SUS304 stainless steel.

· Easy access to all hot zone space via double doors at front and back of the furnace.

· High vacuum pneumatic valves equipped with position indicator in order to automatic control of the vacuum and gas system.

· Use of two sets of gas rotameters in order to control gas flow into the furnace.  

· Equipped with pressure transducer in order to monitor pressure level inside the chamber. In case of overpressure, a relief valve will adjust the pressure inside the chamber.

· Fast gas cooling (quenching) accessories include motor, impeller fan, build-in heat sink and ventilator door in heat shield.

 

Optional Features

 

· High vacuum system to achieve 10^-5 mbar vacuum level

· Dewaxing-Sintering processes in one furnace: Dewaxing system including downward gas stream, hot pipeline with temperature control of pipeline to avoid wax condensation in pipes, condenser for trapping of waxes.

· Gas Purification System

· Cooling Water System

· Distributed Control System (DCS)

· Vertical top loading or bottom loading design

 

Technical Details

 

               * CEDRT: Clean, Empty, Dry, Room Temperature Furnace