Molybdenum Sintering Box

Product Overview and Design Details

    In high-end powder metallurgy sintering, nuclear fuel assembly sintering, and heat treatment of electronic ceramics and rare earth permanent magnet materials under ultra-high vacuum and reducing conditions, the material purity and sealing performance of the sintering container directly determine the density and purity of the final product. Our high-purity precision molybdenum sintering hood/box is specially developed for extreme high-temperature vacuum conditions ranging from 1100℃ to 1900℃, providing micro-area temperature field balance and anti-volatilization and anti-contamination protection for material sintering.

    As shown in the product image, this product consists of a cylindrical molybdenum cover body and a disc-shaped precision molybdenum cover. The cover body is made of high-purity cold-rolled molybdenum sheet, precision rolled, high-vacuum electron beam welded/micro-seam welded, and assembled with a drilled base. Precise ventilation and exhaust micro-holes are opened on the bottom and side walls of the cover body, ensuring rapid gas removal and preventing expansion or residual oxidation during the vacuum extraction stage, while also preventing volatile substances from contaminating other components in the hot zone during sintering. The surface is treated with pickling and bright polishing, the welds are uniform and dense, and the structure has excellent rigidity.

Core technical parameters and specifications

  1. Basic physical and chemical properties Property

  2. Processing technology and specifications

Professional perspective and core value

  1. High-quality weld crack prevention technology and long-term thermal cycling stability

    High-temperature welding of thin-walled molybdenum materials has always been a challenge, as inferior welds are prone to cracking under high-temperature thermal stress. We employ high-power-density electron beam welding or precision shielded gas micro-seam welding technology, resulting in dense, pore-free welds with strength approaching that of the base material. Combined with a high-vacuum stress-relief annealing process, residual processing stress is completely eliminated, ensuring that the sintering cover does not explode or crack during hundreds of temperature cycles.

  2. Solving creep and deformation problems at high temperatures – Upgrading MoLa alloy

    For industrial sintering applications requiring operation above 1400℃ or heavy loads, ordinary pure molybdenum is prone to brittleness and deformation after recrystallization. We offer a sintering cover made of lanthanum oxide-doped MoLa alloy. Its recrystallization temperature is increased to above 1500℃, and it possesses a unique fibrous interwoven grain structure, exhibiting creep resistance several times higher than pure molybdenum, significantly extending the service life of the sintering cover.

  3. Precision micro-orifice design and flow control

    As shown in the details of the image, the micropores precisely distributed on the bottom and sides of the cover have undergone a secondary chamfering and deburring process. The micropore size is designed with fluid dynamics in mind, which ensures that the gas is stable during vacuum pumping and does not blow away the powder blank, while also forming a micro-zone protection during the sintering stage to effectively prevent cross-contamination between the material and impurities in the furnace.

  4. 100% Customization based on provided drawings and rapid sampling

    It supports direct reading of CAD vector drawings such as STEP, IGES, DWG, and DXF provided by buyers. Whether it's small-batch micro crucibles/sintering hoods for research institutions or stacked sintering boxes used in large-scale continuous sintering lines in industrial applications, we can achieve rapid mold matching and sample delivery.

Typical application areas

    Metal Powder Injection Molding and Sintering (MIM & Powder Metallurgy): High-temperature vacuum debinding and sintering containers for micro-complex parts made of titanium alloys, stainless steel and refractory metals.

    Electronic ceramics and target sintering: Sintering protective covers for piezoelectric ceramics, MLCC capacitor materials, high-purity oxides and metal sputtering target blanks.

    Nuclear Industry and Nuclear Fuel Processing: High-purity corrosion-resistant molybdenum shrouds for high-temperature sintering of nuclear fuel pellets.

    Rare earth permanent magnets and luminescent materials: Neodymium iron boron permanent magnet materials and phosphor high-temperature reduction sintering.

Control and export packaging

    Each batch of molybdenum sintering hoods and sintering containers comes with an original manufacturer's quality inspection certificate (MTC) conforming to EN 10204 3.1, including an ICP-MS elemental chemical composition analysis report and a weld non-destructive testing/dimensional measurement report. For thin-walled cylindrical components with lids, we use customized EPE pearl cotton for 1-to-1 nested shockproof fixation, combined with moisture-proof vacuum-sealed bags and export-grade fumigation-free wooden crates for packaging, ensuring zero deformation, zero scratches, and zero oxidation during sea freight and international express delivery.