CN101362591A - 立方氮化硼、制造立方氮化硼的方法、含有立方氮化硼的砂轮、和烧结立方氮化硼压制体 - Google Patents

立方氮化硼、制造立方氮化硼的方法、含有立方氮化硼的砂轮、和烧结立方氮化硼压制体 Download PDF

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CN101362591A
CN101362591A CNA2008102127904A CN200810212790A CN101362591A CN 101362591 A CN101362591 A CN 101362591A CN A2008102127904 A CNA2008102127904 A CN A2008102127904A CN 200810212790 A CN200810212790 A CN 200810212790A CN 101362591 A CN101362591 A CN 101362591A
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boron nitride
cubic boron
magnesium
catalyst substance
cbn
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CN101362591B (zh
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井原荣治
柳泽泰州
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Resonac Holdings Corp
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Showa Denko KK
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Abstract

本发明涉及立方氮化硼、制造立方氮化硼的方法、含有立方氮化硼的砂轮、和烧结立方氮化硼压制体。具体地说，本发明涉及一种制造立方氮化硼的方法，其中在存在催化剂物质的情况下，将六方氮化硼置于立方氮化硼保持热力学稳定的条件下，由此使六方氮化硼进行相变以形成立方氮化硼，其中所述催化剂物质含有锂源、镁源和碳源。即使从六方氮化硼转变成立方氮化硼的相变率提高，也能改进立方氮化硼的性能。

Description

立方氮化硼、制造立方氮化硼的方法、含有立方氮化硼的砂轮、和烧结立方氮化硼压制体
本申请是申请号为200480023531.7的、申请日为2004年8月19日的、发明名称为“立方氮化硼、制造立方氮化硼的方法、含有立方氮化硼的砂轮、和烧结立方氮化硼压制体”的申请的分案申请。
技术领域
本申请涉及立方氮化硼、涉及制造立方氮化硼的方法、涉及含有立方氮化硼的砂轮，还涉及烧结立方氮化硼压制体。
背景技术
立方氮化硼(下文可能缩写成cBN)的硬度仅次于金刚石，而化学稳定性高于金刚石。因此，立方氮化硼越来越多地用作研磨材料、抛光材料或切削材料。已经提出了多种制造cBN的方法。其中，最著名且在工业中应用最广泛的是下述方法：在存在催化剂物质(可以称作溶剂)的情况下，将六方氮化硼(下文可能缩写成hBN)置于cBN保持热力学稳定的条件(约4.0至6.0GPa，约1,400至1,600℃)下，由此使hBN进行相变以形成cBN。
已经提出由碱金属、碱土金属、碱金属氮化物、碱金属硼氮化物、碱土金属氮化物、碱土金属硼氮化物或类似物构成的催化剂物质。
例如，已经提出氮化锂(Li3N)和硼氮化锂(Li3BN2)作为催化剂物质(参看专利文献1)。然而，在存在氮化锂或硼氮化锂的情况下制得的立方氮化硼通常是粒度为50微米或更小并含有未充分生长的晶面的细粒形式。因此，这些立方氮化硼作为磨料粒表现出较差的性能。
还提出了硼氮化钙锂(LiCaBN2)作为催化剂物质(参看专利文献2)。在存在该催化剂物质的情况下制得的cBN呈大致球形并具有优异的机械强度。
还提出了LiMBN2(M代表碱土金属)和Li8SiN4的混合物及LiMBN2和Ca5Si2N6的混合物作为催化剂物质(参看专利文献3和4)。在存在任何这些催化剂物质的情况下制得的cBN具有完全生长的(111)晶面和优异的机械强度。
已经提出一种使用碳源、Si源、碱金属氢化物、碱土金属氢化物或另一催化剂物质制造立方氮化硼的方法(参看专利文献5)。在存在这些催化剂物质的情况下制得的cBN呈现具有锐边的致密透明结晶颗粒的形式。
已经提出氮化锂和硼氮化锂中的至少一种与金属镁和硼化镁中的至少一种的混合物作为合成立方氮化硼用的催化剂，其中镁原子的含量为4至85份(按摩尔计)，锂原子的含量为100份(按摩尔计)(参看专利文献6)。当在存在该催化剂的情况下合成cBN时，与单独使用氮化锂或硼氮化锂的情况相比，粒度大于100微米的晶粒比例增加，晶面生长的更好，且从hBN转变成cBN的相变率升高。
(专利文献1)
美国专利3,772,428的说明书
(专利文献2)
日本已审专利申请，第二次公开S61-283号
(专利文献3)
日本已审专利申请，第二次公开H05-94号
(专利文献4)
日本已审专利申请，第二次公开H05-95号
(专利文献5)
日本已审专利申请，第二次公开H04-2296号，和美国专利5,000,760的说明书
(专利文献6)
日本已审专利申请，第二次公开S53-047239号
当镁对锂的原子比升高时，转变成cBN的相变率升高；然而，在合成催化剂时，当超过85份(按摩尔计)镁原子与100份(按摩尔计)锂原子混合时，cBN颗粒的晶面中孔穴之类缺陷的数目升高；因此，镁的原子比不能升至超过85份，尽管这样预计会提高相变率。
本发明的一个目的是解决上述问题，也就是当镁对锂的原子比升高时，所得cBN颗粒的晶面中孔穴之类缺陷的数目会升高，并由此在合成催化剂时相对于100份(按摩尔计)锂原子能够使用超过85份(按摩尔计)镁原子，以提供一种方法——使用该方法，转变成cBN的相变率升高，所得cBN颗粒的晶面中孔穴之类缺陷的数量降低，且磨料粒的性能改进。本发明的其它目的是提供由上述方法制得的cBN，提供这种cBN的砂轮，并提供烧结cBN压制体。
发明公开
本发明人已经进行了大量研究以解决上述问题，并由此完成了本发明。
更具体地，当使用本发明的方法制造cBN时，与使用常规方法制得的cBN相比，cBN在晶面中具有较少的孔穴之类的缺陷，且磨料粒性能改进，而从hBN转变成cBN的相变率升高。因此，可以以高收率制造下述cBN——其与使用常规方法制得的cBN相比，具有更优的磨料粒性能。此外，当在以100份(按摩尔计)锂原子为基准镁含量为85份(按摩尔计)或更低、更优选5至85份(按摩尔计)的条件下制造cBN时(该比率与常规方法中的基本相同)，磨料粒的性能明显改进。
此外，当使用本发明的cBN制造砂轮时，据显示，与采用由常规方法制得的cBN的砂轮相比，研磨性能提高。
此外，当使用本发明的cBN制造烧结压制体时，获得意外的效果，也就是与采用由常规方法制得的cBN的烧结压制体相比，切削性能改进，特别是抗碎性改进。
相应地，本发明涉及下列内容。
(1)立方氮化硼，其中每1摩尔立方氮化硼含有2×10-4至2×10-2摩尔的镁。
(2)如(1)所述的立方氮化硼，其中每1摩尔立方氮化硼含有2×10-3至2×10-2摩尔的镁。
(3)如(1)或(2)所述的立方氮化硼，其中每1摩尔立方氮化硼含有2×10-3至5×10-3摩尔的镁。
(4)如(1)至(3)任一项所述的立方氮化硼，其中所述立方氮化硼的平均粒度为10微米或更小。
(5)一种制造立方氮化硼的方法，其中在存在催化剂物质的情况下，将六方氮化硼置于立方氮化硼保持热力学稳定的条件下，由此使六方氮化硼进行相变以形成立方氮化硼，其中催化剂物质含有锂源、镁源、和碳源，且以100份(按摩尔计)锂原子为基准，催化剂物质含有5至300份(按摩尔计)镁原子和0.5至30份(按摩尔计)碳原子。
(6)如(5)所述的制造立方氮化硼的方法，其中以100份(按摩尔计)锂原子为基准，催化剂物质含有100至300份(按摩尔计)镁原子。
(7)如(5)所述的制造立方氮化硼的方法，其中以100份(按摩尔计)锂原子为基准，催化剂物质含有5至85份(按摩尔计)镁原子。
(8)如(5)至(7)任一项所述的制造立方氮化硼的方法，其中所述锂源是至少一种选自金属锂、氮化锂和硼氮化锂的材料。
(9)如(5)至(8)任一项所述的制造立方氮化硼的方法，其中所述镁源是至少一种选自金属镁、氮化镁和硼氮化镁的材料。
(10)如(5)至(9)任一项所述的制造立方氮化硼的方法，其中六方氮化硼具有1质量％或更低的氧含量。
(11)如(5)至(10)任一项所述的制造立方氮化硼的方法，其中所述碳源是至少一种选自石墨、炭黑、无定形碳、和烃有机化合物的材料。
(12)如(5)至(11)任一项所述的制造立方氮化硼的方法，其中所述碳源是粉末形式的。
(13)如(5)至(12)任一项所述的制造立方氮化硼的方法，其中在100份(按质量计)六方氮化硼中加入2至50份(按质量计)催化剂物质，并将含有催化剂物质的六方氮化硼置于立方氮化硼保持热力学稳定的条件下，由此使六方氮化硼进行相变以形成立方氮化硼。
(14)一种制造立方氮化硼的方法，其包括将如(1)至(3)任一项所述的立方氮化硼粉化的步骤以获得平均粒度为10微米或更小的立方氮化硼。
(15)如(14)所述的制造立方氮化硼的方法，其进一步包括将粉化的立方氮化硼分级的步骤以获得平均粒度为10微米或更小的立方氮化硼。
(16)通过如(5)至(15)任一项所述的制造立方氮化硼的方法制得的立方氮化硼。
(17)包含如(1)至(4)和(16)任一项所述的立方氮化硼的砂轮。
(18)包含如(1)至(4)和(16)任一项所述的立方氮化硼的烧结立方氮化硼压制体。
附图的简要说明
图1是表示本发明制造立方氮化硼方法的一种具体实施方式中使用的反应容器的总体构造的横截面。
本发明的最佳实施方式
下面将描述本发明的最佳实施方式，其涉及一种制造cBN的方法、涉及cBN、涉及砂轮，还涉及烧结cBN压制体。
当然，提供这些具体实施方式的详述是为了更好地理解本发明的要旨，并且除非另外指明，它们不应该被看成对本发明的限制。
在本发明的制造cBN的方法中，在存在催化剂物质的情况下，将hBN置于cBN保持热力学稳定的条件下，由此使hBN进行相变以形成cBN，其中所述催化剂物质含有锂源、镁源和碳源。
在该制造方法的一个具体实施方式中，将hBN粉末与催化剂物质混合，并将混合物装入模具并在例如100至200MPa下单轴压制，由此产生压制体。将压制体装在反应容器中并置于超高压发生器中，并将反应容器保持在cBN维持热力学稳定的条件(例如，约4至6GPa，约1,400至1,600℃，达大约1秒至6小时)下，由此使hBN进行相变以形成cBN。通过相变，含hBN和催化剂物质的压制体转化成含hBN、cBN和催化剂物质的合成锭料。将所得合成锭料从超高压发生器中取出。此后，分离cBN并提纯。
可以使用商业hBN粉末作为hBN原材料。然而，当hBN含有例如氧化硼形式的氧杂质时，氧杂质会阻碍从hBN到cBN的相变。因此，优选使用具有低氧含量的hBN。具体而言，六方氮化硼优选具有1质量％或更低的氧含量。
hBN优选具有最多100微米的最大粒度。当颗粒太大时，hBN与催化剂物质的反应性降低，导致转变成立方氮化硼的相变率降低，这不是优选的。
本发明中使用的催化剂物质包括锂源、镁源和碳源。
可以使用锂或含元素锂的化合物作锂源。优选地，使用至少一种选自金属锂、氮化锂和硼氮化锂的材料。
可以使用镁或含元素镁的化合物作镁源。优选地，使用至少一种选自金属镁、氮化镁和硼氮化镁的材料。
可以使用碳、碳同素异形体、或含元素碳的化合物作碳源。优选地，使用至少一种选自石墨、炭黑、无定形碳和烃有机化合物的材料。碳源优选为粉末形式。
催化剂物质优选具有最小的可能杂质量。特别地，在杂质中，氧的存在是不优选的，因为从hBN转变成cBN的相变会受阻。
氧含量优选为1质量％或更低，更优选0.5质量％或更低。当氧含量超过1质量％时，所得cBN的结晶度变差。
对催化剂物质的粒度没有特别的限制。通常，催化剂物质优选具有最多100微米的最大粒度。当颗粒太大时，催化剂物质与hBN的反应性降低，导致转变成立方氮化硼的相变率不合意的降低。
所用催化剂物质包括锂源、镁源和碳源。在锂源、镁源和碳源的组合中，优选结合使用作为锂源的氮化锂或硼氮化锂；作为镁源的金属镁；和石墨或无定形碳。
在优选的组合中，“氮化锂、金属镁和石墨”和“氮化锂、金属镁和无定形碳”的组合是最优选的。通过使用任何上述组合，可以以最高相变率制造cBN。
就催化剂物质中所含的锂源和镁源的各自量而言，以100份(按摩尔计)锂原子为基准，镁原子含量优选为5至300份(按摩尔计)，更优选为100至300份。
当镁原子含量小于5份(按摩尔计)时，不能充分提高相变率。而当镁原子含量超过300份(按摩尔计)时，不能进一步提高相变率，且立方氮化硼的形态受损，由此损害磨料粒的性能。
就催化剂物质中所含的锂源和碳源的各自量而言，以100份(按摩尔计)锂原子为基准，碳原子含量优选为0.5至30份(按摩尔计)。
当碳原子含量小于0.5份(按摩尔计)时，不能获得混合效果，而当该含量超过30份(按摩尔计)时，转变成立方氮化硼的相变率会降低，且会影响cBN的生长速度。
通常通过包括将锂源粉末、镁源粉末和碳源粉末混合的方法制备催化剂物质。
以100份(按质量计)hBN为基准时，催化剂物质优选以2至50份(按质量计)、更优选5至30份(按重量计)的量与hBN混合。当催化剂物质的量低于2份(按质量计)时，cBN的机械强度和形态受损，由此损害磨料粒的性能，而当该量超过50份(按质量计)时，作为原料加入的hBN的量降低。从经济角度考虑，这种情况不是优选的，因为在合成过程中制得的cBN的量降低。
在处理催化剂物质和cBN的优选方法中，将各组分的粉末混合在一起。或者，可以将hBN粉末和催化剂物质置于反应容器中，使得这两种组分交替堆叠。具体而言，(1)将hBN粉末与催化剂物质混合，并将混合物装入模具并在大约100至200MPa下压制，由此产生压制体。将压制体装在反应容器中。或者，(2)将hBN粉末和催化剂物质粉末各自装入模具，并在大约100至200MPa下压制装入的粉末，由此产生薄层压制体。将由此形成的hBN压制体和催化剂物质压制体交替堆叠，并将堆叠体装入反应容器。
使用这些方法中的任一种，有利于原料粉末的处理，反应容器中所装原料的容积减小量降低，从而提高生产率。
可以预先向压制体或堆叠体中加入cBN晶种，由此促进由用作晶核的晶种进行的cBN晶体生长。本发明自然还包括这种使用晶种的方法。在这种情况下，可以用上述催化剂物质涂布晶种。
在将上述压制体或堆叠体装入反应容器后，将反应容器置于超高压发生器中，其中将反应容器保持在cBN维持热力学稳定的温度/压力条件下。
在出版文献(例如O.Fukunaga在Diamond Relat.Mater.，9，(2000)，7-12)中描述了cBN的热力学稳定条件。对压制体或堆叠体的放置时间没有特别的限制，且压制体或堆叠体通常放置大约1秒至大约6小时。
通过将反应容器中装的上述压制体或堆叠体保持在热力学稳定条件下，hBN进行相变以形成cBN，由此产生含hBN、cBN和催化剂物质的合成锭料。
随后，将合成锭料压碎以分离和提纯cBN。可以使用已知的分离和提纯方法(参看，例如，日本已审专利申请，第二次公开S49-27757号)。
在一种方法中，将合成锭料压碎成5毫米或更小的颗粒，并在这些颗粒中加入氢氧化钠和少量水。将混合物在大约320℃加热，由此选择性地溶解hBN。将混合物冷却，并用酸洗涤不溶物质并分离，由此产生cBN。
在筛分成日本工业标准(JIS B 4130：1998，“Diamond/CBN产品-金刚石或立方氮化硼的粒度”)中规定的粗砂粒级后，由上述方法制得的cBN可作为磨料粒用于砂轮或类似物。
此外，在粉化所得cBN(更优选地，进一步将粉化的cBN分级)以获得平均粒度为10微米或更小的细粒后，可以使用cBN作为烧结cBN压制体或类似物的原料。
已经揭示，在由本发明的方法制得的cBN中，晶体中所含的cBN合成催化剂的量，特别是镁的量，被控制在特定范围内。
此外，已经揭示，当使用由本发明的方法制得的cBN作为砂轮磨料粒时，与使用由传统方法制得的cBN制造的砂轮相比，表现出较高的研磨比(也就是较小的磨损)和较低的研磨能(较低的抗磨性)。
此外，已经揭示，将由本发明的方法制得的cBN粉化获得cBN细粒，使用该细粒制造的烧结压制体，与常规烧结压制体(将由常规方法制得的cBN粉化获得cBN细粒，使用该细粒制造的烧结压制体)相比，表现出改进的切削性能，更具体地，表现出改进的抗碎性。
已经清楚地了解为什么在使用由本发明的方法制得的cBN形成砂轮或烧结压制体时，砂轮的研磨性能和烧结压制体的切削性能会获得改进；然而，由于这些效果是在晶体中镁(镁是cBN合成催化剂的组分之一)含量在特定的范围内时获得的，因此，相信cBN晶体中所含的镁对砂轮或烧结压制体的烧结过程具有一定影响。
cBN晶体中镁的优选含量为每1摩尔氮化硼分子对应2×10-4摩尔至2×10-2摩尔，镁更优选的含量为每1摩尔氮化硼分子对应2×10-3摩尔至2×10-2摩尔，镁进一步优选的含量为每1摩尔氮化硼分子对应2×10-3摩尔至5×10-3摩尔。
实施例
以下将通过实施例和对比例更详细地描述本发明，它们不应被看成对本发明的限制。
实施例1至16和对比例1至20
向含有氧杂质(0.8质量％)和金属杂质(0.2质量％)且平均粒度为12微米的hBN粉末(100份，按质量计)中，加入各种具有表1和2中所示组成的催化剂物质(10份，按质量计)，由此制备hBN与催化剂物质的混合物。在表1和2中，催化剂物质中的原子(锂、镁、碳和其它元素)比例表示为按摩尔计的相对量。
随后，将实施例1至16和对比例1至20的混合物装入模具，并在150MPa下压制，由此形成柱状压制体(直径：26毫米，高度：32毫米)。将每一压制体置于图1所示的反应容器中。
图1是表示反应容器总体构造的横截面。在图1中，标记1代表容器的外壁，该外壁由充当压力输送器的叶蜡石制成，具有空心圆筒形式，且其内侧装有由石墨空心圆筒和充当分隔材料的叶蜡石衬里8构成的加热器2。另外，容器的顶端和底端各自装有导电钢环3和导电钢板4，而环3和板4的内侧装有充当压力输送器的烧结氧化铝板5和叶蜡石板6，且被叶蜡石板6和叶蜡石衬里8包围的空间充当容纳反应原料的室7。
将反应容器置于超高压发生器中，在此在5.0GPa和1,450℃的条件下将实施例1至16和对比例1至20获得的各压制体处理10分钟。
通过该处理，制造实施例1至16和对比例1至20的合成锭料。从超高压发生器中取出各合成锭料，并压碎成粒度为5毫米和更小的颗粒。在这些颗粒中加入氢氧化钠和少量水，并将混合物在大约320℃加热。将混合物冷却，用酸洗涤不溶物质并过滤分离，由此产生cBN。
使用研钵将由此制得的各合成锭料的一部分粉化，并通过使用CuKα射线的X-射线衍射仪分析粉末。测定属于cBN的(111)面和属于hBN的(002)面的峰的衍射强度，并由下列公式计算转变成立方氮化硼的相变率：(强度(cBN)/(强度(cBN)+强度(hBN)))×100(％)。
用韧度指数评测所得立方氮化硼样品的机械强度。通过下列程序测定韧度指数。将制成的每种立方氮化硼样品(cBN)筛分成如日本工业标准(JIS B 4130：1998，“Diamond/CBN产品-金刚石或立方氮化硼的粒度”)所规定的粗砂粒级120/140。将预定量的由此获得样品和钢珠置于2毫升容器中。将该容器放在振动器中并以3,000±100循环/分钟的频率振动30.0±0.3秒，由此用钢珠将容器中所含的立方氮化硼颗粒粉化。用筛眼为90微米的筛子筛分由此获得的粉末。测量留在筛子上的样品重量，并表示为与全部粉末相比的重量百分比。
此外，测量所得cBN中镁的含量。表1和2中显示了cBN晶体中所含的相对于1摩尔氮化硼分子的按摩尔计的镁含量。
Figure A200810212790D00151
Figure A200810212790D00161
Figure A200810212790D00171
实施例17至20和对比例21至24
将通过实施例6、9、10和12和对比例4、7、8和18的程序制成的各种立方氮化硼样品分级为如日本工业标准(JIS B 4130：1998)规定的粗砂粒级。由属于粗砂粒级100/120的磨料粒制造砂轮片段。具体而言，制备含磨料粒(50体积(v/v)％)、充当粘合剂的硼硅酸盐玻璃粘合体(20体积(v/v)％)、和粘合剂(30体积(v/v)％)(酚醛树脂)的混合物。在150℃压制该混合物，并在900℃(在空气中)烧制所得压制体，由此制造砂轮片段。在用于制造砂轮片段的烧制过程中，所用粘合剂燃烧形成孔。
将制成的各种砂轮片段粘合到铝合金基材上，由此形成砂轮，并在下列条件下对砂轮进行研磨试验。
(试验条件)
砂轮：1A1型，205D×10U×5X×76.2H
研磨机：水平轴表面研磨机(砂轮轴发动机：3.7千瓦)
工件：SKH-51(HRc＝62至64)
工件的表面积：200毫米×100毫米
研磨方法：湿表面纵磨
研磨条件：
砂轮转速：1,800米/分钟
工作台速度：15米/分钟
横向进给：4毫米/次
横向进磨：15微米
研磨液：cBN专用流体(水溶性×50稀释的)，进料9升/分钟
定义砂轮形状的符号是根据JIS B 4131：1998“Diamond/CBN产品-金刚石或CBN砂轮”表示的，工件的参考符号是根据JIS G 4403“高速工具钢”表示的。工件购自市售的那些。
分别通过实施例17样品至实施例20样品和对比例21样品至对比例22样品表示由通过实施例6、9、10和12和对比例4、7、8和18的程序制得的cBN样品制得的砂轮。评测结果显示在表3中。
将通过研磨而除去的工件体积除以研磨过程中的砂轮磨损，获得研磨比，且研磨能是指在研磨过程中使研磨机运行所消耗的电力。换言之，研磨比越高，砂轮的研磨性能就越高，且研磨能越低，砂轮的研磨性能就越高。
在表3中，使用按照实施例6、9、10和12和对比例4、7、8和18的方法制得的cBN中的镁含量表示为相对于1摩尔氮化硼分子的摩尔数。
Figure A200810212790D00201
实施例21至29和对比例25至36
将实施例9和对比例4、7、8和18的cBN颗粒粉化，用酸洗涤并分级，获得平均粒度为1.5微米的cBN细粒。使用含有硬质合金球的球磨在湿法条件下将作为原料的cBN颗粒与表4所示的粘合剂粉末混合24小时。使用丙酮(在试剂中以最高程度分级)作为混合溶剂。在混合之后，将混合物充分干燥，并加入带有硬质合金圆盘(充当基材)的反应容器中。将反应容器装入超高压反应器中，并在大约5.3GPa和1,300℃的条件下处理1小时，获得与硬质合金圆盘结合的烧结cBN压制体。每一烧结压制体具有29毫米的直径、1.2毫米的烧结cBN压制体厚度，和5.0毫米的包括硬质合金圆盘的整体厚度。烧结cBN压制体的粘合剂相的晶体组成在表4中表示成实施例21至29和对比例25至36。晶体组成中包含的碳化钨(WC)和硼化钨被认为是由于使用球磨混合而产生的。
使用金刚石砂轮研磨每一烧结压制体的上表面和下表面，并使用市售电弧放电型钢丝切割装置和激光型切割装置将每一烧结压制体切成13平方毫米的片段。使用这些片段，形成具有按照JIS B 4120：1998，“Indexableinserts for cutting tools-designation”规定为SNMN120308的形状的工具。
对这些工具进行干燥外围切割试验，其中市售钢制工件(各在其外围表面上含有8个凹槽，并按照JIS G 4404：2000，“Alloy tool steels”界定为SKD11(HRc＝60))在下列条件下进行机械加工：其中切割速度设定为100米/分钟，切割深度设定为0.3毫米，且进料设定为0.15毫米/转，计算冲击数直至每个工具都被削掉。
试验结果显示在表4中。冲击数越大，表明工具具有越大的抗碎性。
Figure A200810212790D00221
Figure A200810212790D00231
工业应用性
即使相变率提高，本发明的制造cBN的方法也能够制造具有改进性能的cBN；因此，本发明在工业中极其有价值。
此外，在使用本发明的方法制得的cBN中，cBN晶体中的镁含量被控制在特定的范围内；因此，当使用cBN形成砂轮和烧结压制体时，cBN改进了砂轮的研磨性能和烧结压制体的切削性能；因此，这种cBN极其有价值。

Claims (12)

1.一种制造立方氮化硼的方法，其中在存在催化剂物质的情况下，将六方氮化硼置于立方氮化硼保持热力学稳定的条件下，由此使六方氮化硼进行相变以形成立方氮化硼，其中所述催化剂物质含有锂源、镁源、和碳源，且以100摩尔份锂原子为基准，催化剂物质含有5至300摩尔份镁原子和0.5至30摩尔份碳原子。
2.如权利要求1所述的制造立方氮化硼的方法，其中以100摩尔份锂原子为基准，所述催化剂物质含有100至300摩尔份镁原子。
3.如权利要求1所述的制造立方氮化硼的方法，其中以100摩尔份锂原子为基准，所述催化剂物质含有5至85摩尔份镁原子。
4.如权利要求1或2所述的制造立方氮化硼的方法，其中所述锂源是选自由金属锂、氮化锂和硼氮化锂组成的组的至少一种。
5.如权利要求1或2所述的制造立方氮化硼的方法，其中所述镁源是选自由金属镁、氮化镁和硼氮化镁组成的组的至少一种。
6.如权利要求1或2所述的制造立方氮化硼的方法，其中所述六方氮化硼具有1质量％或更低的氧含量。
7.如权利要求1或2所述的制造立方氮化硼的方法，其中所述碳源是选自由石墨、炭黑、无定形碳、和烃有机化合物组成的组的至少一种。
8.如权利要求1或2所述的制造立方氮化硼的方法，其中所述碳源是粉末形式的。
9.如权利要求1或2所述的制造立方氮化硼的方法，其中在100质量份六方氮化硼中加入2至50质量份催化剂物质，并将含有催化剂物质的六方氮化硼置于立方氮化硼保持热力学稳定的条件下，由此使六方氮化硼进行相变以形成立方氮化硼。
10.通过下述制造立方氮化硼的方法制得的立方氮化硼：其中在存在催化剂物质的情况下，将六方氮化硼置于立方氮化硼保持热力学稳定的条件下，由此使六方氮化硼进行相变以形成立方氮化硼，其中所述催化剂物质含有锂源、镁源、和碳源，且以100摩尔份锂原子为基准，所述催化剂物质含有5至300摩尔份镁原子和0.5至30摩尔份碳原子。
11.含有通过下述制造立方氮化硼的方法制得的立方氮化硼的砂轮：其中在存在催化剂物质的情况下，将六方氮化硼置于立方氮化硼保持热力学稳定的条件下，由此使六方氮化硼进行相变以形成立方氮化硼，其中所述催化剂物质含有锂源、镁源、和碳源，且以100摩尔份锂原子为基准，所述催化剂物质含有5至300摩尔份镁原子和0.5至30摩尔份碳原子。
12.含有通过下述制造立方氮化硼的方法制得的立方氮化硼的烧结立方氮化硼压制体：其中在存在催化剂物质的情况下，将六方氮化硼置于立方氮化硼保持热力学稳定的条件下，由此使六方氮化硼进行相变以形成立方氮化硼，其中所述催化剂物质含有锂源、镁源、和碳源，且以100摩尔份锂原子为基准，所述催化剂物质含有5至300摩尔份镁原子和0.5至30摩尔份碳原子。
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