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Sintered wear-resistant boride material, sinterable powder mixture for producing said material, method for producing the material and use thereof

A technology for sintering materials and wear-resistant materials, which is applied to the fields of sintering wear-resistant boride materials, sinterable powder mixtures for preparing the materials, preparation of the materials and their uses, and can solve the problem that complex geometric shapes or components cannot be produced. , Unable to achieve uniform distribution, low wear resistance and other problems

Inactive Publication Date: 2009-04-15
ESK CERAMICS GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main disadvantage of titanium diboride is its poor sinterability
However, the hot pressing method has the disadvantage that only simple geometries can thus be produced, whereas complex geometries or components cannot be produced by this method
However, these materials with a metallic binder phase, which can also be called cermets, have the disadvantage that they have poor corrosion resistance to air or oxygen due to the metallic binder phase, in particular they are not resistant to acids and alkalis
Although about 6MPa·m is obtained through this material 1 / 2 high fracture toughness, but it has the following disadvantages: a hardness of no more than 18GPa is obtained, which is very low for wear-resistant applications
Furthermore, the sintering method in a powder bed is not suitable for the manufacture of bulky parts and parts with thicker walls, since a uniform distribution cannot be achieved

Method used

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  • Sintered wear-resistant boride material, sinterable powder mixture for producing said material, method for producing the material and use thereof
  • Sintered wear-resistant boride material, sinterable powder mixture for producing said material, method for producing the material and use thereof
  • Sintered wear-resistant boride material, sinterable powder mixture for producing said material, method for producing the material and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 450g TiB 2 Powder (d 50 = 2μm; 1.7% by weight of oxygen, 0.15% by weight of carbon, 0.077% by weight of Fe), 30g tungsten carbide (d 50 50 50 =0.7μm) and 2g Al 2 O 3 (Boehmite as a starting material) together with 10 g of polyvinyl alcohol as a binder with an average molar mass of 1500 and 20 g of stearic acid as a compression aid are dispersed in an aqueous solution and spray dried. The granular spray-dried material was uniaxially pressed at 1000 bar to obtain a green body. The carbonized green body has a total oxygen content of 2.7%. The green body was heated to 2020°C at 10K / min under reduced pressure and maintained at the sintering temperature for 45 minutes. Turn off the heat source and cool under argon.

[0064] The sintered density of the obtained sample was 98% of the theoretical density.

[0065] The optical micrograph of the microstructure is shown in figure 1 in.

[0066] The resulting microstructure contains (Ti, W)B 2 Mixed crystal matrix, finely divided parti...

Embodiment 2

[0069] 450g TiB 2 Powder (d 50 = 2μm; 1.7% by weight of oxygen, 0.15% by weight of carbon, 0.077% by weight of Fe), 30g WC (d 50 50 4 C(d 50 =0.7μm) and 2g Al 2 O 3 (Boehmite as a starting material) together with 10 g of polyvinyl alcohol as a binder with an average molar mass of 1500 and 20 g of stearic acid as a compression aid are dispersed in an aqueous solution and spray dried. The granular spray-dried material was cold isostatically pressed at 1200 bar to obtain a green body. The carbonized green body has a total oxygen content of 2.7%. The green body was heated to 2060° C. at 10 K / min under reduced pressure and maintained at the sintering temperature for 45 minutes. Turn off the heat source and cool under argon.

[0070] The sintered density of the obtained sample was 98.7% of the theoretical density.

[0071] The optical micrograph of the microstructure is shown in figure 2 in.

[0072] The resulting microstructure contains (Ti, W)B 2 Mixed crystal matrix, finely divided ...

Embodiment 3

[0074] 436g TiB 2 Powder (d 50 = 2μm; 1.7% by weight of oxygen, 0.15% by weight of carbon, 0.077% by weight of Fe), 44g WC (d 50 50 2 O 3 (Boehmite as a starting material) together with 10 g of polyvinyl alcohol as a binder with an average molar mass of 1500 and 20 g of stearic acid as a compression aid are dispersed in an aqueous solution and spray dried. The granular spray-dried material was cold isostatically pressed at 1200 bar to obtain a green body. The green body was heated to 2020°C at 10K / min and kept at the sintering temperature for 45 minutes. Turn off the heat source and cool under argon.

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Abstract

The invention relates to a sintered wear-resistant material based on transition metal diborides, comprising: a) as the main phase 80-98.8% by weight of a fine-grained transition metal diboride or transition metal diboride mixed crystal of at least two transition metal diborides or mixtures of such diboride mixed crystals or mixtures of such diboride mixed crystals with one or more transition metal diborides, wherein the transition metals are selected from the IV to VI subgroups of the periodic system, b) as the second phase 0.2 to 5% by weight of a continuous, oxygen-containing grain boundary phase, and c) as the third phase 1 - 15% by weight of particulate boron carbide and / or silicon carbide. Furthermore, the invention relates to a powdered sinterable mixture for producing such a sintered material, a method for producing the sintered material, preferably by pressureless sintering, and also the use of the sintered material for producing wearing parts in general mechanical engineering, in particular chemical plant engineering.

Description

Technical field [0001] The invention relates to a sintered wear-resistant material based on transition metal diboride, a powder sinterable mixture for preparing the sintered material, a method for preparing the sintered material, and the use of the sintered material, which is used to manufacture general Equipment structures, especially wear-resistant parts in the manufacture of chemical equipment structures, used in the manufacture of cutting machines and tools for non-cutting operations and forming, as well as electrode materials for sliding contacts, welding electrodes and erosion nails (Erodierstifte) . Background of the invention [0002] Titanium diboride has many advantageous properties, such as a high melting point of 3225°C, a high hardness of 26-32GPa[HV], excellent electrical conductivity at room temperature and good chemical resistance. [0003] The main disadvantage of titanium diboride is its poor sinterability. Poor sinterability can be partly attributed to impuriti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58
CPCC04B2235/5445C04B35/58064C04B2235/3847C04B2235/3218C04B2235/3821C04B2235/666C04B2235/6567C04B2235/80C04B2235/77C04B2235/96C04B2235/3895C04B35/6455C04B2235/661C04B35/58071C04B35/62655C04B2235/402C04B2235/85C04B2235/9692C04B2235/3813C04B2235/428C04B2235/3826C04B2235/6562C04B2235/604C04B2235/786C04B35/645C04B2235/6581C04B35/58078C04B2235/5436C04B2235/421
Inventor H·塞勒C·施马尔茨里德F·瓦尔迈尔C·莱斯尼亚克
Owner ESK CERAMICS GMBH & CO KG