Annealing and sintering boat

Product overview
We manufacture annealing and sintering boats for continuous and batch furnaces from molybdenum, tantalum, niobium, tungsten and various alloys. The smoothness of the surfaces prevents material adherence. Multiple coating technologies and materials are available to adapt surface properties to specific process requirements.

Your advantages at a glance

• High dimensional stability
• Excellent creep resistance
• High structural stability
• Long service life
• Customized design
• Corrosion resistance

Materials and applications
Materials: molybdenum (Mo), tantalum (Ta), niobium (Nb), tungsten (W) and derived alloys. Suitable for high-temperature processes such as annealing, sintering, MIM, HIP, crystal growth, coatings, welding and other industrial high-temperature applications.

Enhanced dimensional stability using alloys
Using appropriate alloys and optimized production processes improves molybdenum properties. For special dimensional-stability requirements we recommend molybdenum‑lanthanum (ML) and TZM.

Molybdenum-lanthanum (ML)
Pure molybdenum is doped with small quantities of La2O3 to obtain higher ductility and improved creep resistance. The stabilized microstructure and modified recrystallization behaviour prevent premature embrittlement and fracture.

• Higher recrystallization temperature
• Elongated grain structure for increased ductility
• Greater creep resistance

TZM (Mo‑Ti‑Zr carbides)
Microstructure strengthening by titanium and zirconium yields particularly robust material. A Mo–Ti solid solution and Ti–Zr carbides provide optimal strength at elevated temperatures (up to ≈1400°C depending on conditions).

• Improved creep resistance
• Higher recrystallization temperature
• Greater high-temperature stability (up to ~1400°C)

Customized design
Boats can be tailored to individual requirements. Available manufacturing forms include riveted, deep‑drawn and folded versions; welded special designs are possible depending on material and geometry. Various coating technologies are offered to adapt surface chemistry and performance.

Installation and service
On-site installation and assembly for complete hot zones or individual spare parts. Inspection, maintenance and optimization of existing furnaces. Remote technical support available to diagnose issues and reduce downtime.

Related products for high-temperature processes

• Hot zones
• HIP cylinders
• Heating conductors
• Shieldings for high-temperature furnaces
• Rotary tubes
• Riveted racks
• Furnace components
• Crucibles (formed or pressed, sintered)
• Screws, rivets, nuts

Technical characteristics / specifications

• Materials: Mo, Ta, Nb, W and various alloys (e.g. ML, TZM)
• Alloy examples: molybdenum‑lanthanum (ML), TZM (Mo–Ti–Zr carbide strengthened)
• ML: doped with La2O3 — stabilized microstructure, higher recrystallization temperature, improved ductility and creep resistance
• TZM: Ti and Zr additions and carbides — enhanced creep resistance, higher recrystallization temperature, stability up to ≈1400°C
• Surface: smooth to prevent adherence; coating options to adapt surface properties
• Design / manufacturing forms: riveted, deep‑drawn, folded; welded special versions possible
• Applicable furnace types: continuous and batch furnaces; suitable for MIM, sintering, HIP and other high-temperature processes
• Key properties: high dimensional and structural stability, excellent creep resistance, long service life, corrosion resistance