CN1216172C - Process for preparing heterogeneous cemented carbide - Google Patents

Process for preparing heterogeneous cemented carbide Download PDF

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Publication number
CN1216172C
CN1216172C CN 200310110532 CN200310110532A CN1216172C CN 1216172 C CN1216172 C CN 1216172C CN 200310110532 CN200310110532 CN 200310110532 CN 200310110532 A CN200310110532 A CN 200310110532A CN 1216172 C CN1216172 C CN 1216172C
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China
Prior art keywords
hard alloy
hardness
snow
ratio
perching
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CN 200310110532
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Chinese (zh)
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CN1544676A (en
Inventor
王力民
彭英健
唐穗良
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株洲硬质合金集团有限公司
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Priority to CN 200310110532 priority Critical patent/CN1216172C/en
Publication of CN1544676A publication Critical patent/CN1544676A/en
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Publication of CN1216172C publication Critical patent/CN1216172C/en

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Abstract

The present invention provides a method for preparing non-uniform hard alloy, which comprises the following steps: mixed materials are prepared from the materials of the following ratios by weight: 11 to 12% of Co, 44 to 48% of WC of 9.01 to 13 mu m and 41 to 44% of WC of 1.0 to 1.2 mu m; the wet grinding process of the mixed materials is carried out in a ball grinder for 34 to 36 h according to the ball-material ratio of 4.8 to 5.3:1 and the liquid to solid ratio of 450 to 510 ml/kg; then the mixed materials are dried and formed by compression; the vacuum sintering process of the formed mixed materials is carried out under the conditions of vacuum degree being from 10 to 300 Pa and sintering temperature being from 1400 to 1420 DEG C, and then the non-uniform structure hard alloy with high strength and high hardness is prepared. The hardness of the snow perching piece made of the hard alloy prepared according to the method for preparing non-uniform hard alloy reaches 88.0 HRA, the bending strength of the snow perching piece reaches more than 3000MPa, and compared with a snow perching piece prepared according to the prior art, the service life of the snow perching piece is enhanced by more than 20%.

Description

A kind of preparation method of inhomogeneous hard alloy

Technical field

The present invention relates to the preparation of the inhomogeneous hard alloy of the preparation of inhomogeneous hard alloy, particularly high strength and high hardness.

Background technology

Characteristics such as Wimet is because have the intensity height, and the hardness high-wearing feature is good are a kind of tool material and high-abrasive material of widespread use.But the technical problem that generally runs in the Wimet preparation is that high strength and high rigidity are difficult to synchronous realization, and when having high strength, often hardness is low, wears no resistance; When having high rigidity, often intensity is low again, poor toughness.How accomplishing the synchronous realization of high strength and high rigidity as far as possible, satisfy the specific demand of various engineering machinery, drilling tool, is the main contents of Wimet development all the time.Highway communication prosperities such as America and Europe, but the Wimet shovel snowflake on a large amount of snow shoveling machines that use of the country that the ice and snow amount is big, the ice and snow time is long just requires existing high strength, and high rigidity is arranged again.At present, the Co content of a kind of employing 11 μ mWC preparation is 10~11.5% Wimet shovel snowflake, and hardness is 86.5HRA, and bending strength is 2260MPa only, and particularly hardness is low, and is not wear-resisting; The Co content that the another kind of 7 μ mWC of employing prepare is 9.8~10.2% Wimet shovel snowflake, hardness is 87HRA, bending strength is 2420MPa, but intensity is still low, cracked easily in the use, they all exist work-ing life short, and the working cost height can not satisfy the problem of the service requirements of snow shoveling machine fully.

Summary of the invention

The objective of the invention is for solve above-mentioned oneself technology existing problems are arranged, a kind of existing high strength is provided, have again high rigidity the preparation method of novel hard alloy, shovel the production needs that this class of snowflake has the Wimet of particular requirement to satisfy the preparation Wimet, and improve the work-ing life of product.

Realize that the technical scheme that the object of the invention adopts is: based on the technology of existing preparation Wimet, be Co 11~12% by weight during batching, 9.01 the WC 44~48% of~13 μ m, 1.0 WC 41~44% preparation compounds of~1.2 μ m, compound is 4.8~5.3: 1 by ratio of grinding media to material, liquid-solid ratio is 450~510ml/kg, in ball mill, be that medium carries out wet-milling with alcohol, drum's speed of rotation is 34~38r/min, milling time is 34~36h, drying again, compression moulding, be 10~300Pa then in vacuum tightness, sintering temperature is 1400~1420 ℃, carries out vacuum sintering under the condition that is incubated 50 minutes, prepares the hard alloy with nonuniform structure with high strength and high rigidity.

When the advantage of the inventive method is the preparation compound, the correlation theory of utilization Wimet heterogeneous texture, in alloy under the certain condition of cobalt contents, the ratio of reasonably combined coarse particles WC and fine particle or middle particle WC, this heterogeneous texture WC-Co alloy, because WC grain or shape difference are bigger, help reducing the size of porosity, formation of crack number or the minimizing formation of crack of alloy, improve the breaking tenacity and the toughness of alloy; Add fine particle WC, must increase hardness of alloy and wear resistance, the combination of the different WC particle of these two kinds of crystal grain just, and reasonably combined, make the existing higher hardness of alloy, higher intensity is arranged again, and then improved the work-ing life of alloy.Wimet shovel snowflake hardness with the inventive method preparation reaches 88.0HRA, and bending strength reaches more than the 3000MPa, uses mission to improve more than 20% than the shovel snowflake of prior art for preparing.

Embodiment

Embodiment when the present invention is used to prepare the shovel snowflake is as follows:

Embodiment 1: the preparation weight ratio is Co 11%, 9.04 the compound 220kg of the WC 41% of WC 48%, the 1.0 μ m of μ m, prepared mixture is in 180 liter ball mills, carry out wet-milling with alcohol as medium, ratio of grinding media to material is 5.0: 1, and liquid-solid ratio is 460ml/kg, and drum's speed of rotation is 34r/min, milling time is 34 hours, carry out sintering with the conventional vacuum stove after abrasive drying, the compression moulding, sintering temperature is 1420 ℃ (being incubated 50 minutes), and vacuum tightness is 10~300Pa.The final product alloy property is: hardness 88.5HRA, and bending strength 3100MPa, WC mean grain size 2.0 μ m, density is 14.25g/cm 3

Embodiment 2: the preparation weight ratio is Co 11.3%, the compound 220kg of the WC 42.7% of WC 46%, the 1.1 μ m of 11 μ m, prepared mixture is in 180 liter ball mills, carry out wet-milling with alcohol as medium, ratio of grinding media to material is 4.9: 1, and liquid-solid ratio is 480ml/kg, and drum's speed of rotation is 36r/mm, milling time is 35 hours, carry out sintering with the conventional vacuum stove after abrasive drying, the compression moulding, sintering temperature is 1410 ℃ (being incubated 50 minutes), and vacuum tightness is 10~300Pa.The final product alloy property is: hardness 88.3HRA, bending strength 3400MPa, WC mean grain size 2.0 μ m, density 14.20g/cm 3

Embodiment 3: the preparation weight ratio is Co 11.5%, the compound 220kg of the WC 43.2% of WC 45.3%, the 1.2 μ m of 12 μ m, prepared mixture is in 180 liter ball mills, carry out wet-milling with alcohol as medium, ratio of grinding media to material is 5.2: 1, and liquid-solid ratio is 500ml/kg, and drum's speed of rotation is 38r/min, milling time is 36 hours, carry out sintering with the conventional vacuum stove after abrasive drying, the compression moulding, sintering temperature is 1410 ℃ (being incubated 50 minutes), and vacuum tightness is 10~300Pa.The final product alloy property is: hardness 88.0HRA, bending strength 3500MPa, WC mean grain size 2.4 μ m, density 14.15g/cm 3

Embodiment 4: the preparation weight ratio is Co 11.7%, 12.8 the compound 220kg of the WC 43.3% of WC 45%, the 1.0 μ m of μ m, prepared mixture is in 180 liter ball mills, carry out wet-milling with alcohol as medium, ratio of grinding media to material is 5.3: 1, and liquid-solid ratio is 510ml/kg, and drum's speed of rotation is 35r/min, milling time is 34 hours, carry out sintering with the conventional vacuum stove after abrasive drying, the compression moulding, sintering temperature is 1400 ℃ (being incubated 50 minutes), and vacuum tightness is 10~300Pa.The final product alloy property is: hardness 87.9HRA, bending strength 3600MPa, WC average crystal grain 2.4 μ m, density 14.13g/cm 3

Embodiment 5: the preparation weight ratio is Co 12%, 10.5 the compound 220kg of the WC 44% of WC 44%, the 1.2 μ m of μ m, prepared mixture is in 180 liter ball mills, carry out wet-milling with alcohol as medium, ratio of grinding media to material is 4.8: 1, and liquid-solid ratio is 450ml/kg, and drum's speed of rotation is 37r/min, milling time is 36 hours, carry out sintering with the conventional vacuum stove after abrasive drying, the compression moulding, sintering temperature is 1410 ℃ (being incubated 50 minutes), and vacuum tightness is 10~300Pa.The final product alloy property is: hardness 87.6HRA, bending strength 3800MPa, WC mean grain size 2.0 μ m, density 14.10g/cm 3

Claims (1)

1. the preparation method of an inhomogeneous hard alloy, comprise the preparation compound, compound is 4.8~5.3: 1 by ratio of grinding media to material, liquid-solid ratio is 450~510ml/kg, in ball mill, be that medium carries out wet-milling with alcohol, drum's speed of rotation is 34~38r/min, milling time is 34~36h, drying again, compression moulding, be 10~300Pa then in vacuum tightness, sintering temperature is 1400~1420 ℃, carry out vacuum sintering under the condition that is incubated 50 minutes, prepare compounds by weight the WC 41~44% that is WC 44~48%, 1.0~1.2 μ m of Co11~12%, 9.01~13 μ m when it is characterized in that preparing burden.
CN 200310110532 2003-11-18 2003-11-18 Process for preparing heterogeneous cemented carbide CN1216172C (en)

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CN 200310110532 CN1216172C (en) 2003-11-18 2003-11-18 Process for preparing heterogeneous cemented carbide

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CN1216172C true CN1216172C (en) 2005-08-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105132779A (en) * 2015-07-31 2015-12-09 株洲硬质合金集团有限公司 Tungsten-carbide-based cemented carbide and preparation method thereof

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101768679B (en) * 2010-01-29 2012-07-04 株洲硬质合金集团有限公司 Method for manufacturing hard alloy with nonuniform structure
CN102350269B (en) * 2011-09-26 2014-06-11 株洲硬质合金集团有限公司 Hard alloy anvil used for compounding diamond compound sheet and preparation method thereof
CN102418022A (en) * 2011-10-31 2012-04-18 山东金天牛矿山机械有限公司 Hard alloy material for ore
CN102363876B (en) * 2011-10-31 2014-03-05 赣州澳克泰工具技术有限公司 WC-12Co thermal spraying powder and preparation process thereof
CN102758112A (en) * 2012-08-10 2012-10-31 王永富 Micron-nano WC-Co hard alloy, preparation process and application thereof
CN103614604B (en) * 2013-12-16 2016-02-03 重庆市科学技术研究院 For mining Wimet of rotary drilling cut drill and preparation method thereof
CN106086572A (en) * 2016-07-29 2016-11-09 柳州豪祥特科技有限公司 A kind of preparation technology of hard alloy
CN106498258B (en) * 2016-10-31 2018-12-04 浙江德威硬质合金制造有限公司 With in Fisher particle size or fine grained WC powder manufactures the hard alloy with nonuniform structure of coarse-grain

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105132779A (en) * 2015-07-31 2015-12-09 株洲硬质合金集团有限公司 Tungsten-carbide-based cemented carbide and preparation method thereof

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