公开(公告)号：US3741734A

公开(公告)日：1973-06-26

申请号：US3741734D

申请日：1971-10-04

Applicant: GEN ELECTRIC

Inventor： DUNHAM T

IPC: B22F3/24 ,  B22F3/11 ,  B22F3/26 ,  B22F5/00 ,  C22C1/08 ,  C22C1/10 ,  C22C27/04 ,  B22F7/00 ,  B05C3/02

CPC classification number: C22C1/1026 ,  Y10T428/12021 ,  Y10T428/12042 ,  Y10T428/12153 ,  Y10T428/1216 ,  Y10T428/12167

Abstract: A LIQUID DIFFUSION TECHNIQUE IS DESCRIBED WHICH ENABLES FABRICATION OF VARIOUS METALLURGICAL PRODUCTS HAVING A COMPOSITIONAL GRADIENT WHICH DIMINISHES CONTINUOUSLY WITH INCREASING DISTANCE FROM THE EXTERIOR SURFACES OF THE PARTICULAR PRODUCT. MORE PARTICULARLY, THE PRODUCTS OBTAINED BY SAID TECHNIQUUE HAVE A PREDOMINANT MATRIX OF A BASE METALLIC COMPOSITION IN WHICH IS DISPERSED AN ADDITIVE METAL OR METAL COMPOSITION WITH THE ADDITIVE CONCENTRATION BEING UNIFORMLY LESS WITH DIRECTION FROM THE SURFACE OF THE PRODUCT TO THE PRODUCT INTERIOR. IT IS POSSIBLE BY SAID TECHNIQUE TO FORM DISPERSION ALLOY PRODUCTS WHEREIN THE ALLOY AGENT IS PRESENT IN A DISPERSED PHASE AND THE ALLOY CONCENTRATION IS VARIED IN ACCORDANCE WITH LIQUID DIFFUSION PRINCIPLES. THE PRESENT TECHNIQUE IS PARTICULARLY USEFUL IN POWER METALLURGY APPLICATIONS TO PROVIDE PRODUCTS WITH HIGHLY UNIFORM COMPOSITIONAL GRADIENTS WHEN THE SOLUBILITY OF THE ADDITIVE IN THE PARTICULAR MATRIX COMPOSITION IS NOT SIGNIFICANT.

公开(公告)号：US3802851A

公开(公告)日：1974-04-09

申请号：US24893372

申请日：1972-05-01

Applicant: GEN ELECTRIC

Inventor： DUNHAM T

IPC: C22C1/05 ,  C22C1/10 ,  C22C27/04 ,  C22C32/00 ,  H01J1/14 ,  H01J9/04 ,  H01K1/08 ,  B27F1/00

CPC classification number: H01J9/042 ,  C22C32/0031 ,  H01J1/14 ,  Y10T428/12021 ,  Y10T428/12153

Abstract: Dispersion alloy products of tungsten are disclosed containing grain-growth promoting additives uniformly distributed in the tungsten matrix along with a concentration gradient of thoria particles. The thoria particles are distributed in the tungsten matrix so as to provide a compositional gradient which diminishes continuously with increasing distance from the exterior surface of the product to the product interior. In certain cases upon recrystallization of a wire product fabricated with the dispersion alloy material, there is also formed a central core of relatively large tungsten crystals and a shell of smaller more equiaxed crystals near the exterior surface portion of the particular product. In other embodiments, large interlocked grains were formed throughout the wire. Methods of producing these dispersion alloy products are also disclosed.

公开(公告)号：US3853491A

公开(公告)日：1974-12-10

申请号：US28593972

申请日：1972-09-01

Applicant: GEN ELECTRIC

Inventor： DUNHAM T

IPC: H01J61/067 ,  B23K35/32 ,  B23K35/40 ,  C22C27/04 ,  C22C32/00 ,  H01K1/04 ,  H01K1/08 ,  C22C1/05 ,  C22C19/00

CPC classification number: B23K35/402 ,  C22C32/0031 ,  H01K1/04 ,  Y10T428/12021

Abstract: An improved tungsten filament is disclosed containing approximately 1-2 percent by weight thoria particles distributed in the tungsten matrix as a dispersed phase. The thoria particles are distributed in the tungsten matrix to provide a slight but uniform compositional gradient which diminishes continuously with increasing distance from the exterior surface of the filament to the longitudinal central axis. Upon recrystallization of the filament or wire product there is also formed a tungsten grain structure having a more uniform size and shape of the individual tungsten grains than can be obtained by conventional powder metallurgy preparation.

Abstract translation: 公开了一种改进的钨丝，其包含分布在钨基质中的约1-2重量％的作为分散相的硫霉素颗粒。 氧化钍颗粒分布在钨基质中，以提供轻微但均匀的组成梯度，其随着从细丝的外表面到纵向中心轴的距离的增加而连续减小。 在细丝或线材重结晶时，还形成了比通过常规粉末冶金制备可获得的具有更均匀尺寸和形状的钨晶粒的钨晶粒结构。

公开(公告)号：US3798490A

公开(公告)日：1974-03-19

申请号：US3798490D

申请日：1972-09-01

Applicant: GEN ELECTRIC

Inventor： ACKERMAN S ,  DUNHAM T

IPC: C22C27/04 ,  H01K1/04 ,  H01K1/08 ,  H01J1/05 ,  H01J1/14 ,  H01J1/38 ,  H01J1/48 ,  H01J19/06

CPC classification number: H01K1/04

Abstract: An incandescent lamp having a filament made of tungsten wire containing between 1-2 percent by weight thoria has greatly improved resistance to fracture caused by shock and vibration thereby increasing the service life of the lamp. The thoriated tungsten filament has a recrystallized grain structure which is characterized by approximately equiaxed crystals of tungsten of a smaller and more uniform size and thoria particles which are more uniformly distributed throughout the tungsten matrix than can be obtained by conventional powder metallurgy.

Abstract translation: 具有含有1-2重量％的钍的钨丝制成的灯丝的白炽灯大大改善了由冲击和振动引起的断裂耐受性，从而增加了灯的使用寿命。 钍钨丝具有再结晶晶粒结构，其特征在于具有更小和更均匀尺寸的钨的近似等轴晶体和比通过常规粉末冶金可获得的更均匀分布在钨基体上的氧化钍颗粒。