2.4879 Gas-Cooled Vacuum Furnace Heat Treatment Fixture for Gear Ring Heat Treatment

Vacuum Furnace Heat Treatment Fixture & Toolings

Vacuum furnace heat treatment fixtures are specialized support systems designed for processes such as vacuum heat treatment, vacuum brazing, and vacuum sintering. Operating in a unique environment of extremely low pressure (even ultra-high vacuum) and high temperature, their design principles are fundamentally different from those of fixtures for atmospheric or controlled-atmosphere furnaces.
The core requirements are to maintain stability under high-temperature and vacuum conditions, avoid volatilization and contamination of workpieces and the furnace chamber, and ensure uniform heating of workpieces.

I. Core Features and Severe Challenges
1. Ultra-Low Volatility (Top Priority): Tooling materials must exhibit extremely low vapor pressure under high-temperature and high-vacuum conditions. Any volatile substances will directly contaminate the clean environment inside the furnace, condense on cold walls (typically water-cooled jackets), damage vacuum integrity, and may deposit on workpiece surfaces—leading to product rejection (e.g., impaired brazing quality, reduced superalloy performance).

2. Excellent High-Temperature Creep Resistance: Vacuum furnaces are commonly used for processing high-value workpieces (e.g., aerospace components, tooling dies) at extremely high temperatures (up to 1300°C or even 2200°C and above). Tooling must maintain long-term load-bearing capacity without significant deformation at these temperatures.

3. Superior Chemical Stability and Cleanliness: Materials themselves must be highly pure, free of low-melting-point impurities (e.g., zinc, cadmium, lead). Surfaces must be clean, with no residual oil, moisture, or oxides—all of which volatilize violently in a vacuum.

4. High Thermal Radiation Performance: In a vacuum environment, heat transfer relies almost entirely on radiation. Therefore, the surface condition (emissivity) and structural design of tooling materials are critical to ensuring uniform heating of workpieces.

5. Matched Coefficient of Thermal Expansion (CTE): Differences in thermal expansion between tooling and workpieces during heating and cooling cycles generate stress, which may cause workpiece deformation or tooling damage.

II. Selection of Main Materials
The selection of materials for vacuum furnace tooling is central to its design and determines the success or failure of the process.
1. Graphite
2. Molybdenum and Tungsten
3. Refractory metal alloys (such as TZM: titanium-zirconium-molybdenum alloy)
4. Ceramics
5. High-temperature alloys (such as Inconel 600/601/617, Haynes 230, SCH42)

III. Summary
Vacuum furnace fixtures are the critical interface connecting the ultra-high-purity process environment with high-performance products. They are not merely physical supports but are guardians of process purity, shapers of the thermal field, and guarantors of workpiece precision.

The core logic for their selection and design is: To make a trade-off among graphite (economical, high-temperature), refractory metals (very high temperature, high purity), ceramics (ultra-clean, inert), and special alloys (complex structures, medium temperature), based on process temperature, workpiece material (carbon sensitivity), and cleanliness requirements.

Investing in correctly designed and maintained vacuum furnace fixtures is a necessary prerequisite for ensuring the success of high-value-added heat treatments in fields such as aerospace, semiconductors, and premium cutting tools. It represents a deep understanding and mastery of material and process limits.

Material Grade Table:

FAQ:

Q: How to give inquiry ?

A: Step 1, please give us some details about your furnace,operating temperature,cooling method,loading weight of your furnace and so on;

Step 2, it's better to provide 3D drawings;

Step 3, when we have enough details, we may design the products drawings and quote accordingly;

Q: When can I get the price?

A: We usually quote within 24 hours after we get your inquiry(Except weekend and holidays). If you are very urgent to get the price, please email us or contact us in other ways so that we can offer you a quote.

Q: When will make delivery ? /What is the delivery Time?

A: -Sample Order: 35 days after receipt of the full payment.

-Stock Order: 10 days after receipt of the full payment

-OEM Order: 30 days after receipt of the deposit.

Q: What's your after-sales service?

A: 1 year warranty for all kinds of products;

If you find any defective accessories first time, we will give you the new parts for free to replace in the next order, as an experienced manufacturer, you can rest assured of the quality and after-sales service.

Q: What's your payment condition?

A: T/T

Payment<=USD10000, 100% in advance. Payment>USD10000, 50% T/T in advance ,balance before shipment.

Q: What is the shipping method?

A: Transported by DHL, UPS, EMS, Fedex,Air freight, sea freight or train freight.