Factory Price High Quality Graphite Mold for Diamond Tools

• Type: Graphtie Parts
• Composition: Carbon
• Carbon Content: High-Carbon
• Grade: Industrial Grade
• Forming Way: Isostatic Graphite
• Density: 1.72 to 1.85 g/cm3
• Model NO.: HTKJJGS004
• Specific Resistance: No More Than 8.5
• Compressive Strenght: 34 MPa Min
• Shape: Cuistomized
• Material: Graphite
• Transport Package: Wooden Case
• Specification: Customized
• Trademark: Hang Carbon
• Origin: Hebei, China
• Production Capacity: 500000 Piece/Pieces Per Month

Product Description

 

What is Sintering?

Sintering is a traditional process to transform the powdery material into a compact body. Powder raw material is loaded in graphite molds to be sintered or hot pressed. It actually is a heat treatment process where loose material is subjected to high temperature and pressure in order to compact it into a solid piece. This is similar to when ice cubes adhere together in a glass of water due to the temperature difference between the ice and the water, or when you push snow together to form a compact snowball.

 

Application for powder metallurgy industry of our graphite:
Due to its electrical conductivity, strength and thermal resistance, graphite is necessary for powder metallurgy industry. Our graphite molds are used in pressure sintering industry to produce diamond saw segment, diamond core drills, ceramic cutting tool inserts. Our graphite material provides superb performance in hostile environment of extreme heat and pressure which is inherent in the manufacture of metal, ceramic and diamond tools. Our graphite material combines high thermal conductivity with low coefficient of thermal expansion, resulting in the dimensional stability and precision for diamond tools. We select graphite material with relatively high electrical resistivity to use in diamond segment die bodies and punches, to shorten the time required to reach operating temperatures.

What is diamond segment?
The diamond segment is a kind of artificial diamond tool used in stone cutting. It has a hard texture and strong grinding performance. These segments are sintered from very fine metal powder and diamond powder. So what is sintering? How to sinter? Let us explain in detail for you.

The diamond segment turns the powder into the diamond block shape that we finally see via two processes:cold pressing and hot pressing(sintering). The powder is initially pressed and formed by cold pressing, The sintering process is to finally sinter the cold-pressed sheet-like structure into a more tightly bonded diamond segment.
 

In the sintering process, the main sintering methods are solid-phase sintering and liquid-phase sintering. Solid-phase sintering is the main combination method. Through high temperature and high pressure, the atoms between metals interact with each other, making the structure more compact. In a high-pressure environment, an alloy-shaped metal block is formed, so the formation of the diamond segment is not a process of melting all the original materials of the segment, and then cooling and combining it together, but using a solid-phase sintering method. Metal powder and diamond better form a bond with firm structure, high strength, suitable rigidity and hardness. Since the bond mainly plays the role of fixing the diamond and protects the diamond like the metal bond, the sintering process is also called the matrix bond.

 

How is the diamond segment sintered through graphite?

During sintering, the graphite mold is quickly energized. Due to the strong resistance of graphite, the graphite heats up rapidly under the working state of high current. When the temperature rises to a certain level, the increase of the current is controlled to maintain a constant temperature. Usually the process is called the heating and holding stage of the sintering of the segment, and this stage lasts for about 8 minutes.

 

  Advanced Equipments: 
 

 

Rigorous quality control procedure:
Initial production inspection
During Production Inspection
Pre-shipment inspection/Final inspection
 

Graphtie Material Property: 

Property (Typical Value)	TSK	GSK	Unit
Apparent Density	≥1.68	≥1.72	g/cm^3
Max Grain Size	≤2	≤0.8	mm
Specific Electrical Resistivity	8-10	≤8.5	μΩm
Flexural Strength	≥12.5	≥15	Mpa
Compressive Strength	≥28	≥35	Mpa
Porosity	≤24	≤20	%
Ash value	≤0.3	≤0.3	%

 

Property (Typical Value)	HTG-4	HTG-5	Unit
Apparent Density	≥1.78	≥1.85	g/cm^3
Max Grain Size	≤43	≤43	µm
Ash value	≤500	≤500	ppm
Specific Electrical Resistivity	≤12	≤10	μΩm
Flexural Strength	≥35	≥40	Mpa
Compressive Strength	≥60	≥70	Mpa
Shore Hardness	≥40	≥45	HSD
Thermal Expansion (room temperature to 600ºC)	≤4.5	≤4.4	10-6/ºC

 

Property (Typical Value)	HTD-5	HTD-6	HTD-7	HTD-8	HTD-9	Unit
Apparent Density	1.85	1.90	1.82	1.90	1.82	g/cm^3
Max Grain Size	13-15	8-10	8-10	8-10		µm
Ash Content	≤500	≤500	≤500	≤500	≤500	ppm
Purified ASH Content	50	50	50	50	50	ppm
Specific Electrical Resistivity	8-10	8-9	11-13	11-13	11-13	μΩm
Flexural Strength	46	55	51	60	59	Mpa
Compressive Strength	85	95	115	135	121	Mpa
Shore Hardness	48	53	65	70	70	HSD
Thermal Expansion (room temperature to 600ºC)	4.75	4.8	5.8	5.85	5.85	10-6/ºC

 
Note: ASH can be purified to 20 to 50 ppm. 



Our Services:

Efficiency: Your einquiry will be replied with 24 hours 

Fast Delivery: Our produciton capability and enough mateiral stocks will make sure fast devevery
Customization: We provided OEM services based on your design and drawings

Design Service: Our professional and experienced enigneers team can disign for you, if you need
Quality and Price: We offer you high quality graphite products with the most competitive price

After-sales Services: Tracking service for feedbacks of our graphite products, and we will be responsilbe for quality problem.  

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