Introduction

Forging method has a long history whose processing is more mature. Therefore, forging tungsten crucible has a high density which is generally above 19.0g / cm3 and a good performance. What's more, due to its density almost reach ideal theoretical density with a long time, so the properties of the high tensile strength and high-temperature resistance deformation of forging W-crucible are better than other types of wolfram crucibles.

Manufacturing Process

Forging process is a manufacturing process involving the shaping of metal using localized compressive forces. Adopting this process to make tungsten crucible mainly consist of three steps: billet preparation, forging and machining. In general, the relative density of the billet is between 90% and 95%. In the preparation of the billet, the size and quality of the wolfram rod are needed to calculate in accordance with the requirements of the finished product. Then put the wolfram rod in a hydrogen furnace to heat under a temperature of 1400-1600 ℃. After keeping warm for a while, forging the billet, and then repeated heating and forging billets for some times until the size of billet meet the requirements. After the forging, the billet can be annealed, and then processed in accordance with the size and the outlook of the finished product.

Advantages

Forging wolfram crucible is formed through thick wolfram particles hit crumbled into small and uniform tungsten particles, and each of them tightly compacted together. After forging the the original pores, the internal organization of the crucible would be firmer, so this type W-crucible has a high density, and a long using time.

Disadvantages

Affected by equipment and forging process, size of forging wolram crucible is relatively small, generally less than a diameter of 100mm.

Physical Properties

Purity %	Density g/ cm3	Specification(mm)		Tolerance(mm)		Wall-Thickness(mm)	Surface Roughness(μm)
99.95	≥19.35	Diameter 10-500	Height 10-750	Diameter +/-5.0	Height +/-5.0	8-20	Ra=1.6