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![Ultra-high temperature carbon furnace [up to 2800℃]](https://image.mono.ipros.com/public/product/image/2e1/68420016/IPROS_11853087399018078000.jpg?w=280&h=280)
Maximum temperature: 2800℃! Atmosphere furnace [Graphite furnace]
Expert company in electric furnaces, atmosphere furnaces, heating, and heat treatment technology. Here is an introduction to the "Ultra High Temperature Carbon Furnace" manufactured by Marusho Electric Co.
The oxygen concentration can be reduced to the limit, preventing oxidation! By improving the crystallinity of carbon materials, lifespan and performance are significantly enhanced.
The "carbon furnace" is a high-temperature heating furnace composed entirely of graphite (carbon) for the heater, insulation, and furnace walls. It enables heating in the high-temperature range of around 3000°C, which is difficult to achieve with conventional electric furnaces, while also keeping the oxygen concentration inside the furnace to an extremely low level. It is suitable for processes that require high temperatures and low oxygen, such as the sintering of carbon materials that need high crystallization and ultra-high melting point metals. 【Features】 ■ Ultra-high temperature compatibility ■ Low oxygen atmosphere ■ Suitable for high crystallization processing ■ Wide range of material compatibility *For more details, please download the PDF or feel free to contact us.
Graphitization / High-temperature annealing / Surface modification / Ash content reduction all in one machine. Compatible with vacuum × Ar/H2, achieving high reproducibility for research to small-scale production heat treatment.
Our company handles "carbon furnaces" that operate at 3000°C and in extremely low oxygen conditions. We address challenges such as the inability to reduce oxygen partial pressure, leading to oxidation and decarbonization in high-temperature regions that prevent achieving target characteristics, as well as the limited tray flexibility and low processing capacity/strict sample size constraints of tube furnaces. These furnaces can be used for applications involving graphite materials, graphite foils, graphite sheets, isotropic graphite, and molded bodies. [Reasons for Effectiveness in Graphitization] - Easy to create extremely low oxygen: The furnace material captures residual oxygen chemically due to its carbon composition, and the vacuum replacement eliminates air inside the sample beforehand. - Temperature range of 3000°C: Stable heat distribution and retention in the -3000°C graphitization zone, with rapid attainment and high reproducibility. - Flexibility in tray/sleeve design: Rectangular sleeves and stacking allow for simultaneous processing of multiple samples, speeding up condition setting. - Atmospheric flexibility: It is possible to combine vacuum/Ar/N2/low concentration H2 to reduce defects and facilitate thermal desorption. *For more details, please feel free to contact us.
Suppressing micro leaks through years of seal design, processing precision, and assembly procedures! Maintaining low O2 even during long operation!
We will introduce why our small carbon furnace can achieve low oxygen and ultra-high temperatures. The carbon furnace material reacts with residual oxygen, featuring a design and manufacturing know-how that ensures it does not "leak." It removes air from inside the powder using a vacuum pump and replacement method. With a high emissivity graphite heater, a uniform heating hot zone, and high insulation, it efficiently heats while avoiding local overheating, making it possible to stably reach temperatures up to 3000°C. **Features of the Small Carbon Furnace** - Capable of heating up to 3000°C: Achieves ultra-high temperatures in a short time with the radiant heat of the graphite heater. - Easy to sinter in low oxygen: The carbon inside the furnace reacts with residual O2. - Air inside the powder is also replaced: Reduces O2 between particles through repeated cycles of vacuum and inert gas. - Suppresses temperature variations: Reduces differences in the center, edges, and thickness direction with a "uniform heating zone" that warms evenly. *For more details, please download the PDF or feel free to contact us.*
Achieving extremely low oxygen partial pressure through getter treatment and vacuum replacement of furnace material carbon, suitable for processing in ultra-high temperature ranges.
The "carbon furnace" we handle solves challenges such as the time-consuming condition setting and the difficulty of reproducing short cycles. By evacuating the air inside the sample in advance, we shorten the replacement time. Additionally, we can arrange square trays in parallel with flexible tray configurations, allowing for the evaluation of thickness variation effects. We also have test machines available. Please feel free to contact us if you need assistance. 【Reasons Why Our Carbon Furnace is Effective (Partially)】 ■ Sintering at Extremely Low Oxygen Partial Pressure - Gradual replacement from vacuum to Ar/N2 - Reduction of residual O2/oxidizing species through the gettering effect of carbon materials ■ Ultra-High Temperature Process - Long-term stable operation at normal use temperatures up to 2800°C, with a maximum of 3000°C - Precise control of grain growth and rearrangement through gradual heating and holding in the 1200-2600°C range *For more details, please feel free to contact us.
From preprocessing to final firing in one machine. Suitable for research and small-scale production temperature recipes.
Our "Carbon Furnace" allows for the precise reproduction of high-temperature phase transitions, crystallization, and sintering under conditions of "ultra-low oxygen × 3000℃ class × vacuum replacement." It can be used in processes such as promoting phase transitions and recrystallization, controlling grain growth (phase stabilization at high temperatures), densification sintering of ceramics and difficult-to-sinter materials, and energy control of surfaces and interfaces (surface stabilization under low oxygen conditions). It is suitable for developing temperature recipes from research to small-scale production. 【Reasons Why Our Carbon Furnace is Effective (Partial)】 ■ Creates ultra-low oxygen partial pressure - Vacuum pumping → Ar/N2 replacement (dilute H2 if necessary*) to gradually lower the oxygen potential * H2 is operated within the safety design range of the equipment (e.g., below 4%) - The carbon material in the furnace absorbs residual O2 through getter action, suppressing side reactions. ■ High-temperature stability at 3000℃ - Regular use up to 2800℃ / maximum up to 3000℃, with gradual heating and holding for precise control of phase transitions, crystallization, and sintering. *For more details, please feel free to contact us.
Explaining the capabilities of small carbon furnaces from a practical perspective! We will also introduce challenges and benefits.
"While the temperature can be achieved, the targeted reaction site cannot be created." We will overcome that barrier with a small carbon furnace. In this series, we will explain the capabilities of a small carbon furnace that can handle ultra-low oxygen atmospheres (O2 ppm level) and ultra-high temperatures (2,000-3,000°C range) with high reproducibility from a practical perspective. Do you have these challenges? ■ Heating is possible, but characteristics fluctuate with slight oxygen contamination. ■ Large furnaces have slow ramp-up times, making it difficult to establish conditions. ■ Temperature unevenness and undercooking lead to instability in crystallinity and pore structure. Benefits of miniaturization × ultra-low O2 × ultra-high temperature: ■ Reach target conditions in a short time → Increase the number of trials per day. ■ Ensure uniform heating even with small samples → Improved reproducibility. ■ Balance oxygen management and thermal history → Achieve desired crystallinity, conductivity, and microstructure. In this series, we will sequentially introduce the development background, heating principles, application-specific know-how, safety design, specifications & expansions, mini case studies, and FAQs. *For more details, please download the PDF or feel free to contact us.
Introducing the challenges in the research field, directions for solutions, and concepts!
While the demand for dry reduction heat treatment is increasing, the following challenges are prominent in the field. ■ Challenges in Research Settings - Limitations on maximum achievable temperature (recipe design is constrained by material and structural upper limits in tubular furnaces) - Limitations on sample preparation quantity (effective heating area is narrow, making it unsuitable for scale-up considerations) - Difficulty in maintaining extremely low oxygen levels (ppm to ppb level) (due to leaks, residual O2, and fine cracks from heat shock, etc.) ■ Directions for Solutions (Required Specifications) - Uniform heating in a short time: rapid temperature rise, high temperature uniformity, and good response - Flexible scaling: continuous support from small sample sizes to small-scale mass production - Atmosphere control: stabilization of extremely low oxygen levels with Ar/N2 (and a small amount of H2 as needed) plus low residual O2 design ■ Concept Graphite heating element × high insulation structure × low leak design. A compact carbon furnace optimized for prototyping and condition setting, enabling faster and more reproducible dry reduction processes. *For more details, please download the PDF or feel free to contact us.
Why extreme low oxygen and 3000°C levels are possible! Explaining the principles of a small carbon furnace.
The small carbon furnace is characterized by its ability to maintain an extremely low oxygen environment and ultra-high temperatures (around 3000°C). In this explanation, we will simply clarify "why this is possible" from a fundamental perspective. 1) Why does it become "extremely low oxygen"? ■ The furnace material itself acts as an "oxygen getter." The hot zone of the furnace is composed of carbon (graphite). Residual O2/CO2/H2O reacts with carbon and is reduced and fixed as CO/CO2, effectively lowering the oxygen activity. As a result, even materials that are sensitive to oxidation can be processed in a mild atmosphere. ■ Built-in vacuum system + replacement Before heating, the system is evacuated, and by repeatedly purging with inert gas (such as Ar/N2), air inside the sample can be expelled in advance. This is effective for gas replacement in pores and powder gaps that cannot be reached by simple "ventilation." 2) Why is "3000°C" possible? ■ Heating element = high-temperature stability of graphite Graphite exhibits extremely high heat resistance under inert atmospheres and vacuum, allowing for efficient heating of the hot zone through resistance heating. *For more details, please download the PDF or feel free to contact us.
Synthesis and sintering of high-temperature materials, as well as high crystallization of carbon-based materials! Here are some main application examples.
In the previous session, we introduced the "principle" of the small carbon furnace. This time, we will discuss the actual applications and how it can be applied in research and development. ■ Main Examples of Applications 1. Synthesis and Sintering of High-Temperature Materials (up to 3000°C) Thanks to the extremely low oxygen environment unique to carbon furnaces, high melting point materials such as carbides and nitrides can be sintered without oxidation. 2. High Crystallization of Carbon-Based Materials Suitable for the high crystallization of materials such as graphite and carbon nanotubes. 3. High-Temperature Treatment and Reduction Reactions of Metal Materials Metal oxides can be reduced under low oxygen conditions, allowing for control over microstructure and phases. 4. Evaluation of High-Temperature Gas Reactions Interactions with reactive gases and material stability can be verified in various atmospheres such as N2, H2, and Ar. 5. Material Process Evaluation at Research and Development and Prototype Scale Used for R&D purposes to optimize conditions in a short time. In the future, we are considering applications for the development of new materials utilizing more precise control of oxygen partial pressure. Next time, we will provide detailed information about the "specifications." *For more details, please download the PDF or feel free to contact us.
SiC/TiC/ZrC at high temperatures and extremely low oxygen 'quickly and reproducibly.' Optimization of solid-phase carbides, composite carbides (with B4C), and carbon supply conditions in a short cycle.
We handle a compact "carbon furnace" that can be gradually replaced from vacuum to inert gas. It can be used for experiments and processes related to solid-phase carbonization (powder mixing method, coating method, carburizing) and composite carbonization (such as using B4C) for increasing hardness and optimizing carbon supply conditions (types, ratios, and contact states of carbon materials). Please feel free to contact us if you have any inquiries. 【Reasons to Choose Our Carbon Furnace (Partial)】 ■ Rapidly reaches high temperatures - Stable attainment and maintenance of 1600-2800°C** - Temperature guidelines effective for carbonization: SiC 1600–2000°C, TiC 1500–2100°C, ZrC 1800–2300°C ■ Suppresses side reactions at extremely low oxygen partial pressure - Vacuum → Replacement with Ar/N2 - Reduces residual oxygen through getter action of furnace carbon, suppressing CO generation *For more details, please feel free to contact us.
Reproduced well with 'extremely low oxygen × high temperature × vacuum replacement.' Short cycle tests for N2-based solid-phase nitriding, surface nitriding, and layer growth.
The "carbon furnace" we handle is suitable for basic reaction tests of nitriding. Since the reaction initiation temperature is high with N2 alone, balancing grain growth and coarsening is difficult, and during cooling, surface reoxidation occurs, leading to variations in color, resistance, and hardness. Our product addresses these challenges. Additionally, we have a track record of manufacturing furnaces at mass production scales, not just small units. Please feel free to contact us when you need assistance. 【Reasons Why Our Carbon Furnace is Effective】 ■ Creates an extremely low oxygen partial pressure - Gradually lowers the oxygen potential through vacuum pumping and N2 replacement - The carbon in the furnace material absorbs residual O2, suppressing oxidation side reactions ■ Quickly reaches sufficient high-temperature ranges - Achieves and maintains temperatures from 1400 to 2400°C in a short time ■ Short cycle for condition setting - Allows simultaneous evaluation of multiple samples with tray flexibility/shelf configuration, making it easier to verify the effects of thickness and contact *For more details, please feel free to contact us.
