Factory direct high-quality energy-efficient high-purity graphite crucible No. 500 isostatic graphite crucible etc.

Factory direct high-quality energy-efficient high-purity graphite crucible No. 500 isostatic graphite crucible and other sales in the first isostatic molding isostatic molding process involves initial 1. molding pressure is small, the powder particles migrate and heavy accumulation phase. 2. Mid-term pressure increase, powder flow and broken the local stage. 3. Late maximum pressure, the volume of compressed powder, discharge holes, densification stage. Isostatic molding isostatic molding characteristics and the characteristics of isostatic molding principle of the method is approximate axial pressing. Axial pressing as unidirectional or bidirectional pressure pressing, powder and die friction greater pressure along the pressing direction would cause pressure loss, so that the density of each body part of the uniform. The pressure during the isostatic pressing the liquid medium to pass in each direction is equal to the upper. Elastic deformation when subjected to mold the liquid medium pressure is transmitted to the mold powder, powder and die wall friction is small, green body by force, uniform density distribution, product performance has greatly improved. Isostatic pressing of a wet classification isostatic preload good blanks enclosed within resilient plastic or rubber mold, after the seal into the high pressure cylinder, by making the liquid transfer body compression molding. Dry HIP: the elastic fixed mold half, not immersed in a liquid medium, but through the top and bottom of the piston seal. Pressure pump to the high pressure injection of the liquid medium between the cylinder and the pressurizing rubber, rubber molding pressure through the liquid and isostatic pressure transmission enabling body compression molding. Generalized isostatic pressing further into cold isostatic pressing and hot isostatic pressing (HIP broadly divided into cold isostatic molding also hot isostatic pressing Hot isostatic pressing), cold isostatic pressing at room temperature workpiece isostatic molding method. Hot isostatic molding sintering is a special sintering method refers to the high temperature and pressure on the workpiece and other pressures. Hot isostatic pressing the powder material is mainly used in high-performance molded products, such as high temperature alloy powder metallurgy, powder metallurgy high speed steel, ceramics and other industrial production. 1. Pretreatment isostatic molding powder, powder of barren isostatic pressing process is also required for the powder pretreatment to improve the fluidity of the powder by granulation process, adding a binder and a lubricant to reduce body powder friction, improve bond strength, the molding process needs to adapt. 2. molding process, including loading, pressure, pressure, pressure relief process. Charge should try to make the powder filling evenly in the mold, avoid the presence of pores; the pressure should seek stable, adequate compression speed; for different powders and body shape, select the appropriate applied pressure and dwell time; while selecting appropriate depressurization rate. 3. The mold, isostatic mold for special requirements, including sufficient flexibility and conformal capabilities; have a higher tensile rupture strength and abrasion resistance; has good corrosion resistance, not with medium chemical reaction; good release properties; low cost, long service life. Wet isostatic more general use of a rubber mold, dry isostatic mold more use of polyurethane, polyvinyl chloride and other materials. Isostatic common cold isostatic press working pressure of up to 6500kgf / cm2. The container seal structure is different, cold isostatic press can be divided into two types of screw-type and frame. Simple threaded cold isostatic structure, but labor-intensive operations, the process of using badly worn threads, usually a container (cylinder) is small isostatic press; frame cold isostatic press equipment, while complex, security reliable, easy to operate, usually container (cylinder) larger presses. Hot isostatic pressing devices are often equipped with high-pressure vessel of the furnace body, medium pressure gas transportation, electrical, temperature and cooling system components (Figure 2). Until the late 1970s, although the largest hot isostatic press cylinder the size of the diameter of 3050mm, length 9150mm; maximum gas pressure 10500kgf / cm2; maximum heating temperature is 2700 ℃. But pressure hot isostatic press in general industrial production is 1500 ~ 2000kgf / cm2, a temperature of 1500 ℃. When using hot isostatic consolidation powder, the powder blank or preform is made by vibrating the powder directly into the rigid sheath. Wrap seal before welding to be at room temperature or heated vacuum seal welding process. Seal after welding wrap into pressure vessel. Then, you can first enter the gas (lower than the final pressure), and then heat up, due to the heat expansion of the gas eventually reaches a predetermined gas pressure; also available while warming and pressure. Hot isostatic pressing process, the sheath of evacuating and sealing a significant impact on product quality, is one of the key hot isostatic pressing process. Sheath generally use metal (mild steel, stainless steel, titanium, etc.) or a ceramic material. The earliest uses a metal sheath, suitable for producing simple shapes of products; ceramic sheath brittle, not tight, to be placed in a metal jacket, (ceramic powder) filling the gap with a pressure transmission medium between two layers of wrap, ceramic sheath materials are suitable for complex shapes and precise dimensions of products. Isostatic molding applications HIP article has homogeneous structure, high density, small sintering shrinkage, low tooling costs, high production efficiency, forming complex shapes, elongated body and large size products and precision products, and other prominent advantage, is a more advanced molding technology, with its unique advantages began to replace the traditional molding methods, showing that more and more broad application prospects. · Physical and chemical properties of the graphite crucible standard parameter test data Refractoriness ≥ 1630 ℃ Refractoriness ≥ 1630 ℃ carbon content of ≥ 38% carbon content ≥ 41.46% porosity ≤ 35% porosity ≤ 32% volume density ≥ 1.6g / cm3 bulk density ≥ 1.71g / cm3 magic card portion of the crucible size Unit: mm outer diameter specifications catchy Overall height 1 # 70,782 # 871083 # 1,021,204 # 1,121,315 # 1,211,416 # 1,211,548 # 137169 10 # 14818612 # 15619216 # 16421220 # 18323225 # 19625030 # 20826940 # 23929250 # 25731460 # 27032770 # 28036080 # 296336100 # 321379120 # 345388150 # 362429200 # 395483250 # 430557300 # 455610400 # 526661500 # 531713600 # 580600750 # 600650800 # 6107301000 # 6208001500 # 720800