Method for preparing non-bond fine-particle WC-based cemented carbide

Abstract

The invention discloses a method for preparing non-bond fine-particle WC-based cemented carbide. The method includes the following steps that (1) according to the mass fraction, 500 parts of WC mixed powder, 0.15-0.50 part of carbon black and 500-1500 parts of alloy pellets are put into a test machine to be dry-ground for 4-10h, the rotating speed is 30-72r / min, the mixed powder is taken out after halting lasts for 4-6h, and non-bond powder is prepared by means of vacuum drying and sieving; (2) the non-bond powder is sintered through a spark plasma sintering method, the hardness HRA of the prepared product is larger than or equal to 95.4, the density is larger than or equal to 15.30g / cm<3>, the relative density is larger than or equal to 97.4%, and no holes and inclusions are left. Workpieces prepared through the method have excellent performance, holes, inclusions and eta phases are avoided, the HRA is larger than or equal to 95.4, the density is larger than or equal to 15.30g / cm<3> (WC theoretical density is 15.7g / cm<3>), the relative density is larger than or equal to 97.4%, no holes and inclusions exist, the service life is obviously prolonged and the abrasive resistance is obviously improved.

Description

technical field

[0001] The invention belongs to the field of alloy technology, and in particular relates to a preparation method of fine particle tungsten carbide-based hard alloy without binder phase. Background technique

[0002] The tungsten carbide-based cemented carbide currently produced on the market is mainly produced by conventional methods such as hydrogen sintering, negative pressure sintering, hot isostatic pressing (low pressure), etc., and the cobalt content of cemented carbide produced by these conventional methods is relatively high (≥ 3%), due to the increase of cobalt content, it will affect the hardness and wear resistance (HRA≤94.2) and density (density≤15.10 cm 3 ), so the production life of cemented carbide is not long. And these conventional production methods have the disadvantages of long production cycle and high energy consumption. Contents of the invention

[0003] The invention provides a method for preparing fine-grain tungsten carbide-based...

Examples

Embodiment 1

[0021] A method for preparing fine-grain tungsten carbide-based cemented carbide without binder phase, comprising the following steps:

[0022] Step (1), according to the mass parts, mix 500 parts of WC mixed powder (WC mixed powder includes WC powder and Cr 3 C 2 Powder, which contains Cr according to mass percentage 3 C 2 0.5%), 0.15 parts of carbon black and 500 parts of alloy balls (alloy balls include WC powder and Co powder, wherein WC powder: Co powder = 96:4 according to mass percentage, alloy ball diameter 4mm) placed in the experimental machine for dry grinding 4h, rotating speed 30r / min, take out the mixed powder after stopping for 4h, vacuum dry and sieve to obtain non-binding phase powder; stop for 4h to prevent the temperature generated during the dry grinding process from oxidizing or spontaneously igniting the material;

[0023] Step (2), using spark plasma sintering method to sinter the non-binding phase powder, the specific steps are as follows: First, wei...

Embodiment 2

[0026] A method for preparing fine-grain tungsten carbide-based cemented carbide without binder phase, comprising the following steps:

[0027] Step (1), according to the mass parts, mix 500 parts of WC mixed powder (WC mixed powder includes WC powder and Cr 3 C 2 Powder, which contains Cr according to mass percentage 3 C 2 0.8%), 0.40 parts of carbon black and 1000 parts of alloy balls (alloy balls include WC powder and Co powder, in which WC powder: Co powder = 96: 4, alloy ball diameter = 8mm) were placed in the experimental machine to dry Grinding for 8 hours, rotating speed 50r / min, taking out the mixed powder after stopping for 5 hours, vacuum drying and sieving to obtain non-bonding phase powder; stopping for 5 hours to prevent the temperature generated during the dry grinding process from oxidizing or spontaneously igniting the material;

[0028] Step (2), using spark plasma sintering method to sinter the non-binding phase powder, the specific steps are as follows: ...

Embodiment 3

[0031] A method for preparing fine-grain tungsten carbide-based cemented carbide without binder phase, comprising the following steps:

[0032] Step (1), according to the mass parts, mix 500 parts of WC mixed powder (WC mixed powder includes WC powder and Cr 3 C 2 Powder, which contains Cr according to mass percentage 3 C 21.0%), 0.50 parts of carbon black and 1500 parts of alloy balls (alloy balls include WC powder and Co powder, wherein WC powder: Co powder = 96:4 according to mass percentage, alloy ball diameter = 10mm) placed in the experimental machine to dry Grinding for 4-10 hours, rotating speed 72r / min, taking out the mixed powder after stopping for 6 hours, vacuum drying and sieving to obtain non-bonding phase powder; stopping for 6 hours to prevent the temperature generated during the dry grinding process from oxidizing or spontaneously igniting the material;

[0033] Step (2), using spark plasma sintering method to sinter the non-binding phase powder, the specif...

technical field

[0001] The invention belongs to the field of alloy technology, and in particular relates to a preparation method of fine particle tungsten carbide-based hard alloy without binder phase. Background technique

[0002] The tungsten carbide-based cemented carbide currently produced on the market is mainly produced by conventional methods such as hydrogen sintering, negative pressure sintering, hot isostatic pressing (low pressure), etc., and the cobalt content of cemented carbide produced by these conventional methods is relatively high (≥ 3%), due to the increase of cobalt content, it will affect the hardness and wear resistance (HRA≤94.2) and density (density≤15.10 cm 3 ), so the production life of cemented carbide is not long. And these conventional production methods have the disadvantages of long production cycle and high energy consumption. Contents of the invention

[0003] The invention provides a method for preparing fine-grain tungsten carbide-based...

Examples

Embodiment 1

[0021] A method for preparing fine-grain tungsten carbide-based cemented carbide without binder phase, comprising the following steps:

[0022] Step (1), according to the mass parts, mix 500 parts of WC mixed powder (WC mixed powder includes WC powder and Cr 3 C 2 Powder, which contains Cr according to mass percentage 3 C 2 0.5%), 0.15 parts of carbon black and 500 parts of alloy balls (alloy balls include WC powder and Co powder, wherein WC powder: Co powder = 96:4 according to mass percentage, alloy ball diameter 4mm) placed in the experimental machine for dry grinding 4h, rotating speed 30r / min, take out the mixed powder after stopping for 4h, vacuum dry and sieve to obtain non-binding phase powder; stop for 4h to prevent the temperature generated during the dry grinding process from oxidizing or spontaneously igniting the material;

[0023] Step (2), using spark plasma sintering method to sinter the non-binding phase powder, the specific steps are as follows: First, wei...

Embodiment 2

[0026] A method for preparing fine-grain tungsten carbide-based cemented carbide without binder phase, comprising the following steps:

[0027] Step (1), according to the mass parts, mix 500 parts of WC mixed powder (WC mixed powder includes WC powder and Cr 3 C 2 Powder, which contains Cr according to mass percentage 3 C 2 0.8%), 0.40 parts of carbon black and 1000 parts of alloy balls (alloy balls include WC powder and Co powder, in which WC powder: Co powder = 96: 4, alloy ball diameter = 8mm) were placed in the experimental machine to dry Grinding for 8 hours, rotating speed 50r / min, taking out the mixed powder after stopping for 5 hours, vacuum drying and sieving to obtain non-bonding phase powder; stopping for 5 hours to prevent the temperature generated during the dry grinding process from oxidizing or spontaneously igniting the material;

[0028] Step (2), using spark plasma sintering method to sinter the non-binding phase powder, the specific steps are as follows: ...

Embodiment 3

[0031] A method for preparing fine-grain tungsten carbide-based cemented carbide without binder phase, comprising the following steps:

[0032] Step (1), according to the mass parts, mix 500 parts of WC mixed powder (WC mixed powder includes WC powder and Cr 3 C 2 Powder, which contains Cr according to mass percentage 3 C 21.0%), 0.50 parts of carbon black and 1500 parts of alloy balls (alloy balls include WC powder and Co powder, wherein WC powder: Co powder = 96:4 according to mass percentage, alloy ball diameter = 10mm) placed in the experimental machine to dry Grinding for 4-10 hours, rotating speed 72r / min, taking out the mixed powder after stopping for 6 hours, vacuum drying and sieving to obtain non-bonding phase powder; stopping for 6 hours to prevent the temperature generated during the dry grinding process from oxidizing or spontaneously igniting the material;

[0033] Step (2), using spark plasma sintering method to sinter the non-binding phase powder, the specif...