Carbon furnace | Compatible with nitriding reactions and high-temperature sintering tests in an N₂ atmosphere.

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last updated：Jun 24, 2026

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Pre-evaluation of N₂-based nitriding reactions in a very low oxygen, high-temperature environment.

We can accommodate nitriding and high-temperature sintering tests before equipment installation. Even at a stage where temperature, atmosphere, and processing time are not yet determined, you can consult us about testing conditions tailored to your objectives. Through preliminary evaluations using actual samples, you can confirm reactivity and utilize the information for equipment specifications. The "carbon furnace" we handle is well-suited for basic nitriding reaction tests. Since the reaction initiation temperature is high with N2 alone, balancing particle growth and coarsening is challenging, and issues such as surface reoxidation during cooling leading to variations in color, resistance, and hardness can arise. We address these challenges. Additionally, we have production records for furnaces at mass production scales, not just small units. Please feel free to contact us when needed. [Reasons Why Our Carbon Furnace is Effective] ■ Creates an extremely low oxygen partial pressure - Vacuum pumping → Gradually lowering oxygen potential through N2 replacement - The carbon material in the furnace absorbs residual O2 through getter action, suppressing oxidation side reactions ■ Quickly reaches sufficient high-temperature ranges - Reaches and maintains stability at 1400-2400°C in a short time ■ Conditions can be established in a short cycle - Multiple samples can be evaluated simultaneously with a shelf configuration, making it easier to verify the effects of thickness and contact *For more details, please feel free to contact us.

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basic information

【Regarding these issues】 ■ The competition between oxidation and nitridation due to trace O2 contamination leads to a decrease in the phase purity of TiN/ZrN. ■ The reaction initiation temperature is high with only N2, making it difficult to balance grain growth and coarsening. ■ Surface reoxidation during cooling leads to variations in color tone, resistance, and hardness. ■ Due to differences in sample placement and fixtures, results do not align even under the same conditions. 【Items to be confirmed during testing】 ■ Comparison of reactivity based on nitriding temperature and holding time. ■ Confirmation of the impact of oxygen under N₂, Ar, and vacuum replacement conditions. ■ Confirmation of surface reoxidation and color tone changes under different cooling conditions. ■ Evaluation of variations based on sample placement, fixture materials, and filling amounts. ■ Confirmation of processing conditions based on different shapes such as powders, small pieces, and molded bodies. *For more details, please feel free to contact us.

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Applications/Examples of results

【Examples of Usable Experiments and Processes】 ■ Solid-phase nitriding of TiN/ZrN/AlN/Si3N4 (powder mixing/coating) ■ Surface nitriding/layer growth tests for metal and ceramic substrates ■ Re-nitriding/recrystallization annealing (stabilization of resistance, hardness, and color tone) ■ Nitriding pre-treatment/post-treatment: deoxidation, desorption, grain growth control 【Test Application Examples Before Equipment Installation】 ■ Confirmation of nitriding reactivity of new materials ■ Screening of nitriding temperature, holding time, and atmospheric conditions ■ Small-scale prototyping before mass production furnace installation ■ Basic evaluation with powders, pellets, and small piece samples ■ Comparison of color tone, hardness, resistance, grain growth, and surface condition after nitriding *For more details, please feel free to contact us.