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2022-10
What are the main advantages of a vacuum dual-pressure sintering furnace?
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【Summary Description】Sintering is the primary method for manufacturing ceramics. With the advancement of vacuum sintering technology, vacuum double-action pressure sintering furnaces have become the key equipment for sintering both ceramics and alloys. So, let’s now explore the main advantages of these vacuum double-action pressure sintering furnaces!
Sintering is the primary method for manufacturing ceramics. With the advancement of vacuum sintering technology, vacuum double-action pressure sintering furnaces have become the key equipment for sintering both ceramics and alloys. Now, let’s explore this further together. Vacuum Dual-Direction Pressurized Sintering Furnace What are its main advantages, then!
I. Benefits of a Vacuum Dual-Direction Pressure Sintering Furnace
1. Easier Control of Carbon Content: Under vacuum sintering temperature conditions, the influence of the medium is minimal. By carefully controlling the dewaxing process, the carbon content of the alloy remains stable during vacuum sintering, as furnace pressure stays at just a few dozen Pascals (Pa) or lower. With minimal presence of O₂, N₂, H₂, and H₂O molecules, most reactions can be safely ignored, ensuring highly consistent performance and microstructure.
2. It can enhance the purity of sintered alloys; the furnace door doesn’t need to be opened during the entire sintering cycle, preventing air from entering and virtually eliminating reactions involving N₂ and O₂.
3. Improves Solid-Phase Properties of Alloys: Under vacuum sintering conditions, the strength of alloys—especially those containing TiC—is enhanced. Additionally, the surfaces of the hard phases exhibit reduced adsorption of impurities, leading to better wetting properties of the drill bit on these hard phases.
4. The process is simple to operate—vacuum sintering can be performed without the need for filler materials, making it not only easy to handle but also preventing the adverse effects of fillers on the surface of the sintered product.
5. Capable of multi-temperature sintering: Enables isothermal sintering (holding at a constant temperature) at any desired temperature, allowing for the simultaneous execution of multiple functions. It offers independent control over temperature, atmosphere, and furnace pressure across different temperature zones—for instance, during gradient alloy sintering.
In summary, using a vacuum double-action pressurized sintering furnace not only minimizes product oxidation and eases carbon control but also offers the advantages of reducing equipment footprint and lowering labor intensity.
II. The Calcination Process in the Vacuum Dual-Direction Pressurized Sintering Furnace
Currently, the vacuum bidirectional pressure sintering furnace process is mostly conducted in a batch mode, where the various stages of sintering can only be controlled by adjusting the heating rate, temperature, and holding time. Sintered parts are heated, sintered, and cooled along with the furnace itself. During sintering, the product remains stationary within the furnace; therefore, the sintering Vacuum Dual-Direction Pressurized Sintering Furnace The sintering process is set according to the sintering requirements.
The stage of removing lubricants or shaping agents is also known as the pre-baking phase. During this stage, when heating up to around 300°C, it’s crucial to proceed as slowly as possible, allowing sufficient time for the complete removal of the lubricant. This slow升温 ensures that both the lubricant and any shaping agents have enough time to decompose properly. In the subsequent calcination phase, the component is held at a specific temperature for a set duration. The primary goal here is to thoroughly eliminate residual lubricants while enabling internal oxidation-reduction reactions to occur. If the sintered part contains carbon, a carbon-oxygen reaction will take place above 700°C. The duration of the calcination phase varies depending on the amount of lubricant added to the component and the size of the part itself. To ensure all decomposition gases from the lubricant or shaping agent—and any excess oxygen—are fully expelled, the process must be carefully controlled. Whether these gases have been effectively removed can be monitored by observing the vacuum level: if the vacuum stabilizes at a particular value, it indicates that the gases have been successfully eliminated.
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