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Anonymous
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Anonymous
Asked: September 7, 2022In:
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I was wondering if you could kindly provide some info regarding bright annealing of 304 StSt. We have vacuum furnaces here however I require to process these parts within a hydrogen atmosphere and then rapid quench. My question is should ...

304 steelbright annealing
  1. Answer it Forward Challenge Official Account of VacuumFurnaces.com
    This answer was edited.

    For bright annealing of 304 stainless steel (StSt), partial pressure control of hydrogen is often the more practical approach. However, it depends on the specific setup of your furnace and process requirements. For most applications, partial pressure control with hydrogen is recommended, as it proviRead more

    For bright annealing of 304 stainless steel (StSt), partial pressure control of hydrogen is often the more practical approach. However, it depends on the specific setup of your furnace and process requirements. For most applications, partial pressure control with hydrogen is recommended, as it provides a balance between cost, safety, and the required surface finish. However, if your process has specific requirements for ultra-high brightness, you could consider increasing the hydrogen concentration, though not necessarily a full backfill.  

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Answer it Forward Challenge
Asked: July 26, 2021In:
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AMS2750calibration survey
  1. VacuumFurnaces.com Answers

    Our blog post takes a short look at the AMS2750E standard, with a special focus on the requirements set for calibration, calibration accuracy, and test/calibration equipment. The AMS2750E is predominantly designed for heat treatment in the aerospace industry. Heat treatment is an essential process fRead more

    Our blog post takes a short look at the AMS2750E standard, with a special focus on the requirements set for calibration, calibration accuracy, and test/calibration equipment. The AMS2750E is predominantly designed for heat treatment in the aerospace industry. Heat treatment is an essential process for many critical parts of an airplane, so it is understandable that there are tight regulations and audit processes set. While the results and success of some other industrial processes can be relatively easily measured after the process, this is not the case in a heat treatment process. Therefore, very tight control and documentation of the heat treatment process are essential to ensure the quality of the end products.>>>READ MORE

    Source: Beamex Blog for Calibration Professionals

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Fatima Suleiman
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Fatima Suleiman
Asked: June 7, 2021In:
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Installing Viton (elastomer) gaskets on Vertical CF flanges

I was wondering if there are any tips or advice for securing a Viton gasket on a CF flange. One of our flanges would be opened frequently to access our samples but in trying to close it, so we cant ...

elastomer gasketsVertical CF flangesviton gaskets
  1. Answer it Forward Challenge Official Account of VacuumFurnaces.com
    This answer was edited.

    Securing a Viton gasket on a ConFlat (CF) flange can be challenging because Viton gaskets aren't specifically designed for the knife-edge seal of CF flanges, which are typically used with annealed copper gaskets that form a metal-to-metal seal. However, since you're looking for a reusable solution fRead more

    Securing a Viton gasket on a ConFlat (CF) flange can be challenging because Viton gaskets aren’t specifically designed for the knife-edge seal of CF flanges, which are typically used with annealed copper gaskets that form a metal-to-metal seal. However, since you’re looking for a reusable solution for frequent access, there are a few tips and alternative approaches you could try.

    Summary of Options:

    • Use vacuum-compatible grease to hold the Viton gasket in place.
    • Consider magnetic or temporary adhesive solutions.
    • Machine an O-ring groove into the CF flange if permanent modifications are acceptable.
    • Explore elastomeric seal adapters or switch to flanges with O-ring grooves.
    • Ensure careful alignment during closure to avoid shifting the gasket.
    • Check for proper alignment.
    • Consider spring-loaded Viton seals.
    • Consider CF-Compatible O-Ring Seals.
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Answer it Forward Challenge
Asked: April 13, 2021In:
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helium leak rate
  1. VacuumFurnaces.com Answers

    The leak-up rate you should be looking for depends primarily on the type of base metals you are trying to braze. As mentioned at the beginning of this article, any air leak into the furnace represents an influx of oxygen into the furnace. Metals vary considerably in their tolerance of oxygen, with nRead more

    The leak-up rate you should be looking for depends primarily on the type of base metals you are trying to braze. As mentioned at the beginning of this article, any air leak into the furnace represents an influx of oxygen into the furnace. Metals vary considerably in their tolerance of oxygen, with nickel and gold being examples of metals that have a large tolerance for the presence of oxygen. That is, they will not oxidize to the point that there is any negative effect on brazing.

    However, other metals, such as chromium, or base metals which contain titanium and/or aluminum in their chemistry, will be highly sensitive to the presence of any oxygen in the furnace. Thus, may I suggest the following as a guideline for vacuum-furnace brazing:

    Tolerable Vacuum Furnace Leak-up Rates:

    • For base metals that contain any titanium or aluminum: less than five (5) microns per hour.
    • For base metals containing chromium (Cr), or manganese (Mn) but no titanium and/or aluminum: less than ten (10) microns per hour.
    • For base metals containing nickel (Ni), gold (Au), etc., but without any Cr or Mn or Ti or Al: less than fifteen (15) microns per hour.>>> READ MORE

    SOURCE: Kay & Assoc. Brazing Consultants

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Answer it Forward Challenge
Asked: April 10, 2021In:
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thermocouples
  1. Andrew Bassett
    Can a thermocouple be twisted?

    Per AMS2750F, thermocouples can be twisted or bead welded as long as no filler material is used. Proper procedures in constructing either hot junctions is imperative.

    Per AMS2750F, thermocouples can be twisted or bead welded as long as no filler material is used. Proper procedures in constructing either hot junctions is imperative.

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