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Method of boronizing sintered bodies and tools for cold forming operations and hollow wear parts with boronized sintered bodies

A sintered body, cold forming technology, applied in the field of wear-resistant sintered body, wear-resistant sintered body or nozzle), can solve problems such as difficulties

Pending Publication Date: 2021-06-15
HYPERION MATERIALS & TECH SWEDEN AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, despite the current understanding of boridation, due to the difficulty of applying existing boridation techniques (such as boron paste), and the small diameter (especially the diameter below 1-2mm) Ability to efficiently react with boron diffusion, boriding wear surfaces of dies, nozzles and other small or inaccessible surfaces remains problematic

Method used

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  • Method of boronizing sintered bodies and tools for cold forming operations and hollow wear parts with boronized sintered bodies
  • Method of boronizing sintered bodies and tools for cold forming operations and hollow wear parts with boronized sintered bodies
  • Method of boronizing sintered bodies and tools for cold forming operations and hollow wear parts with boronized sintered bodies

Examples

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Embodiment Construction

[0028] 1A and 1B show an example of a conventional die 10 (FIG. 1A) and an example of a conventional nozzle 70 (FIG. 1B) for use in, for example, water jet cutting equipment.

[0029] as from Figure 2AAs seen in cross-section in , the die 10 comprises a tungsten carbide or other hard metal insert (also referred to as a die blank) 12 mounted in a support shell 14, usually made of steel, that maintains compressive stress around the die Inside. Die blank 12 has an inner surface defining a bore 16 extending from upper surface 18 to lower surface 20 . An outer surface 22 connects the upper surface 18 with the lower surface 20 . In a drawing operation, a wire or rod of steel, copper, other metal or alloy enters one side of hole 16 and is lubricated and reduced in size as it is drawn through hole 16 in die blank 12 . The tip of the wire is generally guided into a die 10 and wound onto an opposite side block (not shown). The blocks provide the power to pull the wire through the di...

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Abstract

A wear resistant, sintered body (12, 70) is made of a binderless carbide, cermet or cemented carbide, e.g., WC, W2C and / or eta-phase, with a grain size less than 6.0 micrometers, and less than 6% binder phase (e.g., Co-Ni-Fe). At least some working surfaces (42, 86) of the sintered body (12, 70) are surface treated (130) with a boron yielding method including applying (132) a low viscosity liquid medium having boron or aluminum content and heating (134) at 1200 DEG C to 1450 DEG C under a pressure less than atmospheric pressure or a hydrogen containing atmosphere to from a hardness gradient with an increased hardness of the treated working surfaces (42, 86) of at least 50 to 200 HV5 and favorable compressive stresses in a surface zone that gives a tougher working surfaces of the boronized sintered bodies.

Description

[0001] Technical field and industrial applicability [0002] The present disclosure generally relates to wear-resistant sintered bodies of binder phase-free carbide (BC), cermet or cemented carbide (CC), wherein the sintered body is primarily composed of composition of the hard phase. Boron treatment of the sintered body to obtain functionally graded properties in specific volumes of the body. The functionally graded nature of the sintered body increases hardness, creates favorable compressive stresses in the surface, and improves the erosion and wear resistance of the sintered body. The present disclosure also relates to methods of boron treating wear resistant sintered bodies to obtain functionally graded properties in specific volumes of the body. Background technique [0003] In the discussion that follows, reference is made to specific structures and / or methods. However, the following references should not be construed as an admission that these structures and / or metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56B21D37/00C22C29/00
CPCC04B35/5626C04B2235/327C04B2235/3409C04B2235/616C04B2235/6581C04B2235/6582C04B2235/762B21C3/04C22C29/08C22C29/04B22F2003/244C04B41/87C04B41/009C04B41/4539C04B41/4556C04B41/5006B21C3/02B26F3/004C04B35/563C04B2235/386
Inventor 斯特凡·斯文-奥洛夫·埃德吕德
Owner HYPERION MATERIALS & TECH SWEDEN AB