MY Molded Graphite – QDZRT Graphite

Product Details

MY Series comprises molded graphite grades manufactured by QDZRT Graphite. It is intended for projects that need a practical balance of block size, machinability, mechanical performance, electrical properties, and cost.

The table distinguishes typical/reference properties from explicitly marked minimum or maximum limits. Final grade specifications and batch documentation are confirmed with the order.

MY Series Specification & Grade Architecture

Grade	Bulk Density(g/cm³)	Resistivity(μΩ·m)	Grain Size	Flexural Strength(MPa)	Compressive Strength(MPa)	Thermal Conductivity(W/(m·K))	CTE(×10⁻⁶/K)	Shore Hardness	Ash
MY-T01	1.80 g/cm³	8–10 μΩ·m	—	40 MPa	80 MPa	125 W/(m·K)	4.9 ×10⁻⁶/K	45	500 ppm
MY-T02	≥1.758 g/cm³	≤33.63 μΩ·m	14–20 μm	≥119 MPa	≥352 MPa	≤65 W/(m·K)	6.4 ×10⁻⁶/K	≥113	—
MY-T03	1.84 g/cm³	11.8 μΩ·m	8–12 μm	53.75 MPa	106.6 MPa	156 W/(m·K)	4.4 ×10⁻⁶/K	56	—

Typical / reference properties unless a minimum or maximum value is explicitly stated. Final order specifications are confirmed by grade and batch.

Standard Molded Block Specifications & Billet Formats

MY Series molded graphite is manufactured via uniaxial and hydraulic die pressing. This forming route allows efficient production of medium to large rectangular blocks with high compaction density and reliable mechanical performance. Standard factory formats include:

Format Type	Standard Billet Dimensions (mm)	Typical Supply State
Standard Molded Blocks	400 × 400 × 800 mm 500 × 500 × 1000 mm 300 × 300 × 600 mm	Raw as-pressed block, custom sawn blanks (-0/+2 mm), planed plates
Large Slabs & Sintering Plates	Up to 600 × 600 × 200 mm 500 × 1000 × 150 mm	Surface-ground slabs for furnace hearths and metallurgical trays
Cylindrical Molded Rounds	Φ200 to Φ500 mm (length 400–800 mm)	Rough turned rounds, crucibles, rings, and casting dies

Forming Characteristics & Cost-Performance Balance

Molded graphite bridges the gap between high-end isostatic graphite and coarse extruded stock. It delivers key engineering advantages for large-volume industrial applications:

Balanced Grain Structure (15–45 μm): Offers high mechanical strength, uniform thermal conductivity, and good thermal shock resistance.
Economical Volume Production: Tooling and processing efficiencies provide substantial cost savings compared to isostatic pressing for medium-to-large components.
Thermal Shock Resistance: Highly resilient against rapid temperature cycling in metal casting and high-temperature sintering.
CNC Machinability: Freely machinable into complex geometry with standard carbide or PCD cutting tools.

Graphite block and plate components for vacuum furnace hot zones and industrial fixtures. — MY Series molded graphite blocks machined into high-temperature vacuum furnace fixtures and sintering trays.

Impregnation & Surface Modification Capabilities

To meet demanding operational environments involving fluid sealing, abrasive wear, or oxidizing atmospheres, QDZRT Graphite provides in-house vacuum-pressure impregnation services:

Resin Impregnated (Phenolic / Furan / Epoxy): Reduces open porosity; fluid and gas permeability must be verified for the selected treatment; ideal for mechanical seal rings, pump vanes, and chemical rotary joints.
Metal Impregnated (Antimony, Copper, Babbitt): Significantly increases compressive strength, wear resistance, and electrical conductivity for heavy-duty bushings, electrical contacts, and pantograph sliders.
Anti-Oxidation Impregnation: Chemical salt treatment that may improve oxidation resistance under qualified service conditions, prolonging service life in industrial furnace fixtures.

Typical Applications & Selection Guidance

Target Industrial Sector	Typical Supplied Components	Operating Demands & Performance Rationale
Non-Ferrous Continuous Casting	Crystallizer sleeves, casting dies, feed nozzles, stopper rods	High thermal conductivity and self-lubricating properties for horizontal and vertical continuous casting of copper, brass, bronze, and aluminum.
Precious Metal Smelting	Melting crucibles, pouring troughs, bullion ingot molds, stirring rods	Ultra-low ash content (<50 ppm) and high density to prevent melt contamination and slag adhesion during gold, silver, and platinum refining.
Cemented Carbide & Powder Sintering	Sintering boats, multi-tier trays, pusher plates, furnace saggers	High thermal shock resistance and anti-carburization stability in vacuum and protective atmosphere furnaces up to 1800°C.
Battery Materials & Heat Treatment	Grooved setter plates, sagger boxes, carrier trays, pusher slabs	Uniform heat transfer, dimensional stability across repetitive thermal cycles, and resistance to corrosive off-gases during anode/cathode calcination.
Industrial Vacuum Furnaces	Hearth support blocks, thermal shrouds, heating elements, connection pins	High compressive strength, minimal thermal expansion, and structural rigidity for high-load hot-zone frameworks.
Diamond Tools & Superhard Tooling	Hot-pressing dies, top/bottom punches, segment spacer plates	High compressive strength (>85 MPa) under severe hydraulic tonnage and elevated sintering temperatures.
Mechanical Seals & Bearings	Dynamic/static seal rings, split bushings, guide bearings, rotary joint rings	Self-lubricating dry-running capability, fine grain structure, and optional resin or metal impregnation for zero permeability.
Photovoltaic & Semi Auxiliaries	Base pedestals, PECVD carrier strips, crucible support rings, shield blocks	Cost-effective thermal field components for auxiliary zones where high purity and thermal stability are required without isostatic cost.
Glassware & Optical Hot-Bending	3D glass bending molds, bottle takeaway tongs, conveyor rollers	Mirror-finish machinability, non-wetting surface against molten glass, and anti-scratch properties preventing surface defects.

Frequently Asked Questions (FAQ)

Q1: When is molded graphite preferable over isostatic graphite?

Molded graphite is preferred when parts have medium-to-large dimensions (e.g., continuous casting dies, sintering boats, and furnace hearth plates) where the extreme ultra-fine grain of isostatic graphite is not strictly required. MY Series molded graphite provides sufficient density and mechanical strength at a potentially more cost-effective route, subject to grade, size, and order quantity.

Q2: Can MY Series molded graphite parts be impregnated for mechanical sealing?

Yes. QDZRT Graphite provides vacuum-pressure impregnation with phenolic resins or metals (antimony/copper). This can reduce open porosity; permeability is verified against the project specification and significantly enhancing self-lubricating wear resistance.

Q3: What machining tolerances are maintained on custom molded graphite trays and boats?

Standard milling tolerances for molded graphite parts are maintained at ±0.05 mm, with critical locating pins or sealing surfaces held to ±0.02 mm.