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Quartz Ring and Disc Crucibles

Quartz Ring and Disc Crucibles

-- Steady & Reliable Manufacturer --

Introduction

Quartz Ring and Disc Crucibles are high-purity vessels designed for use in extreme high-temperature processing, particularly in the semiconductor, material science, and crystal growth industries. Unlike standard ceramic or metal crucibles, those made from fused quartz offer exceptional chemical purity (SiO2​≥99.99%) and resistance to most corrosive molten materials, crucial for applications where even trace contamination can ruin a product batch. Yancheng Mingyang Quartz Products Co., Ltd. manufactures these crucibles in two primary forms: Disc Crucibles (shallow, wide containers for thin-film deposition and melting) and Ring Crucibles (used primarily as liners, covers, or protective rings within larger furnace setups). Our manufacturing utilizes specialized rotating fusion techniques to ensure a seamless, non-porous surface finish on the interior, preventing material adherence and maximizing the lifespan of the crucible.

The most famous application for large-diameter quartz crucibles is the Czochralski (CZ) Process for growing single-crystal silicon ingots for the solar and semiconductor industries. In this process, the crucible holds the molten silicon, and the ultra-high purity of the quartz is non-negotiable, as SiO2​ dissolution into the melt is the primary source of oxygen contamination in the final silicon wafer. Our large-diameter crucibles are manufactured with a smooth, homogeneous inner surface and controlled wall thickness to ensure predictable thermal transfer and mechanical stability during the 1420∘C melting and pulling process. We offer crucibles in both clear and opaque fused silica; opaque crucibles are typically used in the CZ process because their ability to diffuse heat (thermal buffering) helps control the complex temperature gradient required for crystal growth. We supply custom sizes, wall thicknesses, and specialized rims/flanges to fit various furnace architectures, providing a critical consumable component for the world's most advanced material processing technologies.

By focusing on ultra-high purity and geometric accuracy, we provide reliable quartz crucibles that are integral to high-yield crystal growth and contamination-sensitive high-temperature material applications.

Specification Parameters

ParameterDetails
Crucible TypeDisc (Shallow), Ring (Liner/Cover), Conical, Cylindrical
Purity (SiO2​)Ultra-High Purity ≥99.995% (Low Trace Elements)
Diameter Range50 mm to 1200 mm (Crucial for CZ process)
Wall/Base Thickness (WT)Engineered 3 mm to 20 mm (For mechanical and thermal stability)
Material GradeClear Fused Quartz (For research) or Opaque Fused Silica (For CZ production)
Max Operating TempUp to 1450∘C (Dependent on melt material and load)
Surface Finish (Internal)Fire Polished / Non-Porous (Minimizes wetting and contamination)
Thermal PropertyLow Thermal Expansion / High Thermal Shock Resistance

The most stringent technical specification for large Quartz Ring and Disc Crucibles used in silicon crystal growth is the Ultra-High Purity and the integrity of the internal Surface Finish. Any trace element contamination, particularly alkali metals, can leach into the molten silicon, resulting in electronic defects and lower wafer yield. The non-porous, fire-polished inner surface is essential to minimize the reaction area between the molten silicon and the quartz, thereby controlling the dissolution rate and oxygen content in the final crystal. For the CZ process, the choice of Opaque Fused Silica is critical; the milky structure provides a thermal shield that helps manage the heat transfer from the graphite heater elements to the silicon melt, which is necessary for precise control of the solid-liquid interface (the crystal growth front). We control the WT and profile to optimize this thermal management. Our manufacturing process, which often involves rotational shaping under extreme heat, ensures uniformity and structural integrity, preventing deformation or premature failure at 1420∘C under the heavy load of the silicon melt. The sheer size of these crucibles (up to 1200 mm in diameter) demands specialized handling and QC to guarantee the required CZ process geometry.

Applications

  • Czochralski (CZ) Silicon Crystal Growth: Large disc-shaped crucibles holding molten silicon for the pulling of single-crystal silicon ingots (the primary material for solar cells and computer chips).

  • High-Purity Material Melting: Used as non-contaminating vessels for melting specialty metals, glasses, and high-purity powders in laboratories and pilot production plants.

  • Thin-Film Deposition Sources: Smaller disc or ring crucibles are used as evaporation or sputtering sources in vacuum coating systems.

  • Ashing and Sample Preparation: Utilized in analytical chemistry for high-temperature ashing of samples to remove organic content, leveraging quartz’s inertness and high temperature rating.

  • Furnace Accessories and Liners: Ring crucibles are used as collars, liners, or supports inside larger CZ or FZ (Float Zone) furnaces to protect structural components from heat and vapor.

  • Gemstone and Specialty Crystal Growth: Used for the controlled growth of high-value non-silicon crystals requiring high purity and specific thermal environments.

The value of our crucibles in the CZ process is measured directly in the quality and size of the final silicon ingot. The high-purity quartz minimizes oxygen and carbon introduction, which are key defects that can reduce the efficiency of the finished wafer. The unique thermal buffering of the opaque quartz is crucial for controlling the thermal gradients at the melt surface, which directly impacts the crystal's diameter control and defect density. We offer custom CZ components, including quartz covers and protective rings, that work in conjunction with the main crucible to optimize the thermal and vapor environment inside the furnace. For smaller research applications, the high chemical resistance of the crucibles means they can be cleaned thoroughly with strong acids (e.g., HF solution) for reuse, offering an economical advantage over single-use ceramic crucibles. Our commitment to scaling up to the latest generation of large-diameter silicon crystal growth (e.g., 1200 mm diameter) ensures we remain a strategic supplier in this high-tech sector.

Advantages

  • Ultra-High Material Purity: Guaranteed ≥99.995% SiO2​, minimizing contamination risk in sensitive melting and crystal growth processes (e.g., silicon).

  • Excellent Thermal Stability: Withstands up to 1450∘C and resists thermal shock, ensuring structural integrity under demanding process conditions.

  • Opaque Grade Thermal Buffering: The diffusion properties of opaque quartz are essential for controlling the complex, critical temperature gradients in the Czochralski crystal growth process.

  • Non-Porous, Fire-Polished Surface: Minimizes material wetting, adherence, and reaction with the molten content, extending service life and reducing contamination.

  • Large Diameter Capability: Able to produce crucibles up to 1200 mm diameter, supporting the latest, largest-scale silicon crystal growth furnaces.

  • Chemical Inertness: Resistant to most acids and alkalis, facilitating thorough cleaning for reusable labware and ensuring no reaction with molten metals.

The primary advantage is the combined purity and thermal management capability, which is non-negotiable for silicon crystal growth. Our controlled rotational fusion process ensures the geometric consistency and internal surface quality that directly correlate to high yield in the CZ process. For clients, this means fewer defects in the final wafer and greater production efficiency. We offer a specific focus on supplying the necessary graphite support susceptors that mate perfectly with our quartz crucibles, providing an integrated, thermally optimized solution. Our ability to supply custom wall thicknesses and $\text{OD}$s provides the flexibility needed for researchers and $\text{OEM}$s developing next-generation material processes.

Payment and Shipping

We accept secure international payments, T/T and L/C, often structured with progress payments for large-scale, high-value CZ crucibles. We offer volume contract pricing for continuous supply agreements with solar and semiconductor manufacturers.

Shipping Protocol for Crucibles: Protection against impact and surface damage is critical.

  • Contamination-Free Packaging: Smaller crucibles are cleaned, sealed in HEPA-filtered plastic bags, and boxed. Large CZ crucibles are handled in a clean environment and sealed.

  • Custom Crating: Large-diameter crucibles are secured in custom wooden crates with engineered foam or support rings that prevent movement and distribute weight evenly, protecting the critical rim.

  • Freight: Primarily using sea or air freight based on client urgency and size. Full insurance and QC certificates, including purity analysis reports, accompany every shipment.

Lead times for standard size crucibles are 15−20 working days; large-diameter CZ crucibles require 4−10 weeks due to the specialized fusion and cooling cycles.

Frequently Asked Questions (FAQ)

  • Q: Why is opaque quartz used more often than clear quartz in the silicon CZ process?

  • A: The opaque quartz's milky structure diffuses heat, acting as a thermal buffer between the molten silicon and the intense graphite heating elements. This diffusion helps achieve the precise, low-gradient temperature field required for stable, high-quality single-crystal growth, which clear quartz would not provide.

  • Q: Can the quartz crucible be used multiple times in silicon growth?

  • A: No, large CZ crucibles are typically single-use due to the unavoidable reaction and erosion of the inner quartz wall by the molten silicon, which can lead to contamination or structural failure in subsequent runs. Smaller research crucibles are often cleaned and reused for non-critical melts.

  • Q: What is the highest temperature a quartz crucible can withstand?

  • A: Quartz's softening point is around 1680∘C. For practical use, our crucibles are rated up to 1450∘C to maintain structural integrity under load. This is sufficient for processes like silicon melting (1414∘C) and most metal/oxide melts.

  • Q: Do you also supply the graphite components that support the quartz crucibles?

  • A: Yes, we offer high-purity, precision-machined graphite susceptors, holders, and heaters designed to perfectly match our quartz crucibles, providing a complete and thermally optimized solution for the client's furnace.

From Made-in-China to
Global Smart Manufacturing

Yancheng Mingyang Quartz Products Co., Ltd. is a company specializing in the production of quartz and special glass products. Yancheng Mingyang Quartz Products Co., Ltd. is the production plant of Jinzhou Mingde Quartz Glass Co., Ltd. in Jiangsu, Since its establishment, the company has developed rapidly, introduced advanced technology and production equipment at home and abroad, and continuously improved and improved product quality. Relying on its own advantages, we have developed a variety of products suitable for the market and meet the needs of different customers, and solved many urgent production problems for our customers.

The company's products include quartz glass tubes, double-hole quartz glass tubes, quartz glass rods, quartz sheets, sapphire windows, calcium fluoride glass windows, infrared ultraviolet coatings, high-pressure resistant aluminosilicate glass window panels, quartz glass instruments, high borosilicate glass instruments, quartz crucibles, quartz gold-plated tubes, quartz heaters, quartz infrared heating tubes, far-infrared directional radiation heaters ultraviolet germicidal lamps and other special types of quartz glass products.

Yancheng Mingyang Quartz Products Co., Ltd.
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