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金属钨和碳为原料,将平均粒径为 3~5μm 的钨粉与等物质的量的碳黑用球磨机干混,充分混合后,加压成型后放入石墨盘,再在石墨电阻炉或感应电炉中加热至1400~1700℃,较好控制在1550~1650℃。在氢气流中,较初生成 W2C,继续在高温下反应生成WC。或者首先将六羰基钨在650~1000℃、CO气氛中热分解制得钨粉,然后与一氧化碳于1150℃反应得到 WC,温度高于该温度可生成 W2C。
Tungsten and carbon are used as raw materials. The tungsten powder with an average particle size of 3-5 micron is mixed with carbon black of the same material by ball mill. After mixing, the powder is pressed into a graphite plate and heated to 1400-1700 (?) C in a graphite resistance furnace or an induction furnace. The best temperature is 1550-1650 (?). In the hydrogen gas, W2C was first generated and continued to react at high temperature to produce WC. Or the tungsten hexacarbonyl powder was prepared by thermal decomposition of tungsten hexacarbonyl in the atmosphere of 650 ~ 1000, CO, and then reacted with carbon monoxide to obtain WC at 1150, when the temperature was higher than that, W2C could be formed.
化学反应式:2W + C = W2C;W + C = WC
Chemical reaction formula: 2W + C = W2C; W + C = WC
将三氧化钨WO3加氢还原制得钨粉(平均粒度3~5μm)。再把钨粉与炭黑按等摩尔比的混合物(用球磨机干混约10h),在1t/cm2 左右的压力下加压成型。将该加压成型料块放进石墨盘或坩埚内,用石墨电阻炉或感应电炉在氢气流中(使用露点为 -35℃ 的纯氢)加热至1400~1700℃(较好是1550~1650℃),使之渗碳则生成WC。反应从钨粒周围开始进行,因为在反应初期生成W2C,由于反应不完全(主要是反应温度低)除WC之外尚残存有未反应的W及中间产物W2C。所以必须加热到上述高温。应该根据原料钨的粒度大小来确定较高温度。如平均粒度为150μm 左右的粗粒,则在1550~1650℃的高温下进行反应。

Tungsten trioxide WO3 was hydrogenated and reduced to tungsten powder (average particle size of 3~5 m). Then the tungsten powder and carbon black are mixed in the same molar ratio (dry mixing for about 10 hours with a ball mill) and formed under pressure of about 1 t/cm 2. The pressure forming block is put into a graphite plate or crucible, and heated to 1400-1700 (- 35C dew point pure hydrogen) by a graphite resistance furnace or an induction furnace in a hydrogen gas stream (preferably 1550-1650 (-35C dew point pure hydrogen)) to form WC. The reaction begins around the tungsten particles, because W2C is formed at the initial stage of the reaction, and there are unreacted W and intermediate W2C in addition to WC due to incomplete reaction (mainly low reaction temperature). Therefore, the above heat must be heated. The highest temperature should be determined according to the particle size of tungsten. For example, coarse particles with an average particle size of about 150 m were reacted at high temperatures of 1550~1650 C.

数控刀具刀片回收

化学反应式:WO3 + 3H2 → W + 3H2O;2WO3 + 3C → 2W + 3CO2;2W + C = W2C;W + C = WC
Chemical reaction formula: WO3 + 3H2 + W + 3H2O; 2WO3 + 3C + 2W + 3CO2; 2W + C = W2C; + + + =
硬质合金对碳化钨WC粒度的要求,根据不同用途的硬质合金,采用不同粒度的碳化钨;硬质合金切削刀具,比如切脚机刀片V-CUT刀等,精加工合金采用超细亚细细颗粒碳化钨;粗加工合金采用中颗粒碳化钨;重力切削和重型切削的合金采用中粗颗粒碳化钨做原料;矿山工具岩石硬度高冲击负荷大采用粗颗粒碳化钨;岩石冲击小冲击负荷小,采用中颗粒碳化钨做原料耐磨零件;当强调其耐磨性抗压和表面光洁度时,采用超细亚细细中颗粒碳化钨做原料;耐冲击工具采用中粗颗粒碳化钨原料为主。
According to the requirement of tungsten carbide WC granularity for cemented carbide, different granularity tungsten carbide is adopted according to different usage of cemented carbide; cutting tools for cemented carbide, such as V-CUT cutter for foot-cutting machine blade, fine tungsten carbide is used for finishing alloy; medium-sized tungsten carbide is used for roughing alloy; gravity cutting and heavy cutting. The alloy is made of medium and coarse grained tungsten carbide as raw material; the mine tools are made of coarse grained tungsten carbide with high hardness and high impact load; the rocks with small impact load are made of medium grained tungsten carbide as wear-resistant parts; and the superfine and fine grained tungsten carbide is used as raw material when the wear resistance and surface finish are emphasized. Medium and coarse grained tungsten carbide raw materials are the main tools for impact resistance.
碳化钨理论含碳量为6.128%(原子50%),当碳化钨含碳量大于理论含碳量则碳化钨中出现游离碳(WC+C),游离碳的存在烧结时使其周围的碳化钨晶粒长大,致使硬质合金晶粒不均匀;碳化钨一般要求化合碳高(≥6.07%)游离碳(≤0.05%),总碳则决定于硬质合金的生产工艺和使用范围。
The theoretical carbon content of tungsten carbide is 6.128% (atomic 50%). When the carbon content of tungsten carbide is higher than the theoretical carbon content, the free carbon (WC + C) appears in tungsten carbide. When the free carbon is sintered, the tungsten carbide grains around the tungsten carbide grow up, resulting in uneven grain size of cemented carbide. Less than 0.05%, the total carbon depends on the production technology and application scope of cemented carbide.
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