CN101594966B - 亚微米α-氧化铝高温粘结磨料 - Google Patents

亚微米α-氧化铝高温粘结磨料 Download PDF

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CN101594966B
CN101594966B CN2007800465401A CN200780046540A CN101594966B CN 101594966 B CN101594966 B CN 101594966B CN 2007800465401 A CN2007800465401 A CN 2007800465401A CN 200780046540 A CN200780046540 A CN 200780046540A CN 101594966 B CN101594966 B CN 101594966B
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alumina
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blocking agent
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R·宝尔
M·L·斯科隆
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Saint Gobain Ceramics and Plastics Inc
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Abstract

高温粘结磨料，包括氧化铝研磨砂粒和玻璃状粘合基质，所述氧化铝研磨砂粒分布于所述玻璃状粘结基质中，所述玻璃状粘结基质具有不小于1000℃的固化温度。所述氧化铝研磨砂粒包括多晶α-氧化铝，其具有由不大于500nm的α-氧化铝平均晶畴尺寸表征的精细晶体微结构，并且所述氧化铝研磨砂粒进一步包括阻塞剂，所述阻塞剂是在多晶α-氧化铝中的分散相。

Description

亚微米α-氧化铝高温粘结磨料
技术领域
本发明的方面通常涉及高温粘结磨料工具和构件，具体而言，涉及引入精细微结构氧化铝研磨砂粒(abrasive grits)的高温粘结磨料。
背景技术
高性能研磨材料和构件已经长期被用于各种工业机械加工应用中，所述应用包括研磨/磨削——其中要进行大块材料去除——到精细抛光——其中精细的微米和亚微米表面不规则性被解决。进行此类机械加工作业的典型材料包括各种陶瓷、玻璃、玻璃-陶瓷、金属和金属合金。磨料可以采用多种形式中的任意一种，例如在磨料浆中的自由磨料，其中处于悬浮的松散磨粒被用于机械加工。可选地，磨料可以采用固定磨料的形式，例如，砂带或粘结磨料。砂带一般被分类为具有下层衬底的磨料构件，在该衬底上研磨砂粒或磨料粒通过一系列制备涂层和上胶涂层被粘结到其上。粘结磨料典型地不具有下层衬底并且由通过基质粘结材料而粘合在一起的研磨砂粒的整体结构形成。
现有技术的粘结磨料利用了玻璃状的粘结材料，例如，二氧化硅基玻璃粘结基质。可选地，用于一些应用的专用粘结磨料掺入了超细研磨砂粒，例如立方碳化硼和金刚石，并且通过使用金属合金粘结基质，可以被整体粘结。
近年来在粘结磨料持续得以发展的同时，利用由玻璃状材料形成的粘结基质的高温粘结磨料受到特别的关注。高温粘结磨料构件的实例在美国专利5,282,875中被描述。尽管现有技术高温粘结磨料构件已经提高了性能和耐久性，但是在本领域对进一步改进的构件存在持续的需要。
发明内容
根据一个方面，提供了高温粘结磨料，其包括氧化铝研磨砂粒和其中散布有该氧化铝研磨砂粒的玻璃状粘结基质。该玻璃状粘结基质具有高温性质，包括不小于大约1000℃的固化温度。所述氧化铝研磨砂粒包括多晶α-氧化铝，其具有由不大于500nm的α-氧化铝平均畴尺寸(domain size)表征的精细晶体微结构。所述氧化铝研磨砂粒进一步包括阻塞剂(pinning agent)，所述阻塞剂包括在多晶α-氧化铝相中的分散相。
根据另一方面，提供了高温粘结磨料，其包括氧化铝研磨砂粒和其中散布有该氧化铝研磨砂粒的玻璃状粘结基质。所述玻璃状粘结基质具有不小于大约1000℃的固化温度。所述氧化铝研磨砂粒包括多晶α-氧化铝，其具有由不大于300nm的平均畴尺寸表征的精细晶体微结构。此外，所述氧化铝研磨砂粒包括阻塞剂，所述阻塞剂至少包括分散在多晶α-氧化铝相中的氧化锆相。
此外，提供了形成高温粘结磨料的方法。该方法需要：在不小于1350℃的温度下热处理含有阻塞剂的α-氧化铝前体，形成精细晶体微结构的α-氧化铝研磨砂粒。然后形成含有α-氧化铝砂粒和玻璃状粘结基质材料的成型体。此外，在不小于1000℃并且高于玻璃状粘结基质材料的熔点的固化温度下进行该成型体的热处理。在热处理之后，该氧化铝研磨砂粒具有不大于大约300nm的平均晶畴尺寸。
具体实施方式
根据实施方式，高温粘结磨料包括氧化铝研磨砂粒——其具有特别精细的微结构——和玻璃状粘结基质——该氧化铝研磨砂粒分布在所述玻璃状粘结基质中。
首先，转到氧化铝研磨砂粒的描述，典型地该氧化铝研磨砂粒主要由多晶α-氧化铝形成。该多晶α-氧化铝一般形成该砂粒的主要相，也就是说，按重量计至少50％。但是通常地，该氧化铝研磨砂粒为至少60wt％、通常至少80wt％的多晶α-氧化铝，以及在一些实施方式中为至少90wt％的多晶α-氧化铝。该多晶α-氧化铝具有精细晶体微结构，其可由不大于500纳米(nm)的α-氧化铝平均晶畴尺寸表征。晶畴是分散的可识别的微结构的结晶区，其由单晶的聚集形成或者可以由单晶形成。但是，根据一些实施方式，该晶畴是单晶并且通过扫描电子显微镜术分析容易被观察到。该晶畴尺寸可以甚至更精细，例如不大于400nm或不大于300nm。在甚至更精细的晶畴尺寸情况下，该晶畴典型地是如上所述的单晶。这样的细晶畴可以特别地小，例如不大于200nm，不大于190nm，或甚至不大于180nm。值得注意的是该精细晶畴尺寸存在于高温粘结磨料构件的后处理中。这是特别值得注意的，因为形成该高温粘结磨料的过程经常包括高温处理，此时玻璃状粘结基质固化。这样的高温处理具有引起晶畴增长的趋势，这是特别不希望的。下面提供进一步的细节。
如上面所提到，该氧化铝研磨砂粒进一步包括阻塞剂。阻塞剂是与砂粒的α-氧化铝微结构无关的材料，并且可以通过分散在多晶α-氧化铝基质相中的第二相来鉴定。该阻塞剂通过有效地“阻塞”该晶畴，从而在该砂粒烧结和/或高温处理期间防止过度的晶畴增长，以便形成粘结磨料构件。阻塞剂的实施例包括氧化物、碳化物、氮化物、和硼化物，以及其与多晶α-氧化铝基质的反应产物。根据具体的实施方式，该阻塞剂包括硅、硼、钛、锆和稀土元素之中至少一种的氧化物，以及其与多晶α-氧化铝基质的反应产物。具体的阻塞剂是氧化锆，通常是ZrO2(二氧化锆)的形式。氧化锆是特别适合的材料，并且在多晶α-氧化铝基质中通常是惰性的，以便与氧化铝进行非常有限的反应，从而保持氧化锆晶体相，典型地为二氧化锆。该阻塞剂通常以不小于大约0.1wt.％的量存在于氧化铝研磨砂粒中，例如不少于大约0.5wt.％的量，或不小于1.0wt.％的量。阻塞剂的下限被选择为有效防止过度晶畴增长的量。
根据一个实施方式，该阻塞剂以不大于40wt.％的量存在于研磨砂粒中，例如，数量不大于30wt.％、不大于20wt.％、或甚至不大于10wt.％的量。在该高温粘结磨料中，该阻塞剂通常被鉴定为具有不大于5微米例如不大于1微米的颗粒尺寸。与该阻塞剂相关的细颗粒尺寸已经被发现是有用的，例如不大于500nm，或不大于300nm，或不大于200nm。如下面更详细的描述，在形成高温粘结磨料构件方法的情况中，该阻塞剂可以以固体形式引入氧化铝研磨砂粒中，例如以亚微米形式，特别地包括胶态形式。可替代地，该阻塞剂可以被引入氧化铝研磨砂粒或其前体中，使得在高温热处理时该阻塞剂前体转化成希望的晶相，例如希望的氧化物、碳化物、氮化物或硼化物。
根据本发明的实施方式形成高温粘结磨料的过程通常以形成氧化铝研磨砂粒开始。根据具体的实施方式，该氧化铝研磨砂粒通过接种过程被形成，其中适合的接种材料与α-氧化铝前体结合，随后进行热处理，以便将α-氧化铝前体转化成希望的α-氧化铝相。晶种可以根据US 4,623,364形成，其中接种的凝胶氧化铝干燥前体被煅烧，以便形成α-氧化铝。该煅烧的α-氧化铝可以进一步被处理，例如通过碾磨，以提供适合的高表面积晶种材料。典型地，该表面积通过不小于10m2/g，典型地不小于20m2/g的比表面积(SSA)进行量化，例如不小于30m2/g，或不小于40m2/g。具体的实施方式具有不小于50m2/g的表面积。通常，该表面积被限制，例如不大于300m2/g，例如不大于250m2/g。
该晶种材料随后和α-氧化铝前体结合，其采用几种形式铝材料中的任何一种，其是转化成α-氧化铝的合适形式。这样的前体材料包括，例如，水合氧化铝，其包括三水合氧化铝(ATH)和勃姆石。如本文所使用，勃姆石表示包括矿物勃姆石——典型地是Al2O3·H2O并且具有在15％程度的含水量——以及假勃姆石，具有大于15％的含水量，例如20％到38％——在内的氧化铝水合物。因此，术语勃姆石被用于表示具有按重量计15到38％含水量例如15到30％含水量的氧化铝水合物。应当注意，包括假勃姆石在内的勃姆石具有特定的且可识别的晶体结构，并因此具有独特的X射线衍射图，引起其区别于包括其它水合氧化铝在内的其它铝材料。
典型地，该α-氧化铝前体例如勃姆石与接种材料结合，使得晶种以相对于该晶种和α-氧化铝前体的总固体含量不小于0.2wt.％的量存在。典型地，晶种以小于30wt.％的量或典型地以不大于20wt.％的量存在。
晶种和α-氧化铝前体通常以浆形式结合，该浆体随后例如通过添加适合的酸或碱例如硝酸被凝胶化。凝胶化之后，该凝胶通常被干燥、碾碎，并且使干燥的材料通过分级筛。然后使该分级的固体成分经历烧结过程，其具有限定的均热时间。典型地，烧结进行的时间期间不超过30分钟，例如不大于20分钟、不大于15分钟。根据具体的实施方式，该烧结时间特别地短，例如不大于10分钟。
根据具体的发展，阻塞剂或阻塞剂前体被加入到含有晶种和α-氧化铝前体的悬浮液中。典型地，基于α-氧化铝前体、晶种和阻塞剂或阻塞剂前体的组合固体含量，该阻塞剂或阻塞剂前体以不大于40wt.％的量存在(基于在最终α-氧化铝砂粒中阻塞剂的固体含量计算)。通常，该阻塞剂，基于如上面所提到的总固体含量，以不小于0.1wt.％例如不小于大约0.5wt.％、或甚至不小于大约1wt.％的量存在。
仍进一步，根据具体的发展，在将α-氧化铝前体有效转化为α-氧化铝所必需的温度之上的温度下进行烧结。在这个意义上，一些实施方式要求“过-烧结”(over-sintering)α-氧化铝前体材料。特别适合的温度通常不小于1350℃，例如不小于1375℃，不小于1385℃，不小于1395℃或不小于1400℃。在这个方面，应当注意，尽管精细微结构的接种α-氧化铝材料在本领域已经形成，但是这样的材料通常在较低温度进行处理，通常低于1350℃，例如在1300℃的级别上。本文下面提供了对使用阻塞剂和过-烧结结合效果的进一步观察。
在烧结之后，任选分级的研磨砂粒随后与玻璃状粘结材料结合，成形为适合的几何轮廓(例如，砂轮)，其轮廓和形状在粘结磨料领域的环境中是非常适合的。完成该粘结磨料构件的加工过程典型地包括在固化温度下热处理。如本文所使用，固化温度表示与玻璃状粘结基质材料相关的材料参数，并且通常超出该粘结材料的熔化温度特别是其玻璃化转变温度Tg。该固化温度是这样的最小的温度：在此温度下该粘结基质材料不仅仅软化并成为可流动的，而且其可流动程度确保完全润湿并粘结到研磨砂粒。典型地，根据本文的实施方式，该固化温度不小于1000℃，这通常表明高温粘结磨料的形成。
根据下面的描述，进行具体的实施例。
实施例
实施例1(比较)
在400毫升的派热克斯玻璃烧杯中，将30克以商品名DISPERAL得自Sasol Inc of Hamburg Germany的氧化铝氢氧化物(假勃姆石)粉末搅拌到61毫升的去离子水中(电阻系数为2兆欧厘米)。
作为晶种原料，如US4,623,364中制备的接种凝胶氧化铝干燥前体在1100℃在旋转干燥炉中被煅烧5分钟，以便将氧化铝转化为α形式，其通过BET方法测量的表面积为15到20m2/g。将72千克的这种α-氧化铝原料与150千克的去离子水混合，并进料到由Netzsch Company(总公司Selb，德国)生产的卧式砂磨机中。该设备的型号是LMZ-25。在浆液持续地循环通过该磨机的情况下，使碾磨进行24小时。通过Saint-Gobain生产大小为46粒度的大约40千克氧化铝磨料被用作碾磨介质。在碾磨之后，表面积是大约75m2/g。
如上所制备的1.43克晶种浆体在搅拌下被加入到Disperal的浆体中。
随后向该混合物在搅拌下加入7.5克按重量计20％的HNO3溶液，同时继续搅拌，得到的混合物形成凝胶。
该凝胶在95℃下干燥过夜，随后用木擀面棍碾碎。通过30目筛而在45目筛上保留的砂粒部分被保留下来。
5克保留砂粒随后放入到氧化铝皿中并放入预热的管式炉(Lindberg Blue M系列STF 55433)中进行烧结。烧结进行总共5分钟。
样品在3个不同的温度下进行烧结：1300℃、1350℃和1400℃。测量硬度和晶体大小性质。
含有玻璃状粘结基质的烧结砂粒的粘结磨料构件通过混合1.22克烧结砂粒和0.72克粉末玻璃并且加入2滴7.5wt.％的聚乙烯醇(PVA)溶液来制备。该玻璃粉末的组成通常是二氧化硅基的，其具有二氧化硅的主要成分。典型的二氧化硅含量不小于按重量计50％，典型地不小于按重量计60％，诸如不小于按重量计65％。该玻璃粉末的附加成分包括氧化物，例如氧化铝、氧化钠、氧化镁、氧化钾、氧化锂、氧化硼、二氧化钛、氧化铁、氧化钙、其它氧化物和其组合。选择形成该粘结基质的玻璃粉末的具体组成，以便具有如上面所详细讨论的期望的高固化温度和Tg。该混合物随后被放入到1.25cm不锈钢模中且在10,000psi压制。得到的圆盘随后被放入冷隔焰炉(Lindberg类型51524)中且在8小时内加热到1250℃，在该温度下保持4小时，且随后在8小时内冷却。得到的圆盘被制备成抛光部分，并测量硬度和晶体大小。
实施例2
该实施例阐述了ZrO2阻塞剂对防止不希望晶体增长以及提供抗蚀性的效果。
如实施例1制备研磨砂粒陶瓷体，除了胶态ZrO2以相对于最终氧化铝值为按重量计0.5％的水平、以相对于最终氧化铝值为1.0％的水平和以相对于最终氧化铝值为2.0％的水平被加入。ZrO2来源是从Nyacol得到的NYACOL 20nm ZrO2乙酸酯稳定形式。如实施例1制备和测量样品。
实施例3
该实施例阐述了SiO2阻塞剂对防止不希望晶体增长以及提供抗蚀性的效果。
如实施例1制备研磨砂粒陶瓷体，除了胶态SiO2以相对于最终氧化铝值为按重量计0.5％的水平、以相对于最终氧化铝值为1.0％的水平和以相对于最终氧化铝值为2.0％的水平被加入。SiO2来源是从Nyacol Inc，Ashland，MA得到的NYACOL胶态SiO2氨水稳定形式。如实施例1制备和测量样品。
实施例4
该实施例阐述了Y2O3阻塞剂对防止不希望晶体增长以及提供抗蚀性的效果。
如实施例1制备研磨砂粒陶瓷体，除了硝酸钇溶液以相对于最终氧化铝值为按重量计0.5％的当量氧化钇水平、以相对于最终氧化铝值为1.0％的当量氧化钇水平和以相对于最终氧化铝值为2.0％的当量氧化钇水平被加入。硝酸钇来源来自Alrdich chemicals。如实施例1制备和测量样品。
实施例5
该实施例阐述了在包括氧化镁的复合体中阻塞剂/抗蚀剂的影响。材料如实施例2利用按重量计2％的ZrO2和作为硝酸镁溶液添加的按重量计1％的MgO来制备。该实施例还掺入了氧化钴(0.08％)着色标记物，作为腐蚀程度的视觉指示剂。使用的氧化钴前体是硝酸钴。
上面所描述的实施例的晶畴尺寸随后通过实施例抛光部分的扫描电子显微镜术(SEM)进行测量。典型使用50,000X的放大率，在低于烧结温度100℃下热腐蚀样品5分钟，并通过无需统计校正的截距方法报告或获得晶畴尺寸。根据本文的实施方式，晶畴在高温下相当稳定，其可以以晶体稳定性进行量化。晶体稳定性在本文被定义为所述氧化铝研磨砂粒在这样的温度下暴露5分钟之后经历以不大于500nm平均畴尺寸量化的有限晶畴增长时的温度。本文的实施方式具有至少1400℃例如至少大约1500℃的晶体稳定性。
除了晶畴尺寸量化之外，使用几种技术量化腐蚀程度。在高温粘结磨料形成期间，玻璃状粘结基质材料具有渗透并与氧化铝砂粒反应的趋势。这样的侵蚀是极其不希望的，并且可以在硬度方面进行测量。在本文，通过获取其中心和外围边附近(距离该外围边大约15到30微米)的小烧结体(大约0.5mm)的硬度数据，测量硬度。使用熟知的Vickers微量压痕方法，荷载为500克。观察到，随着陶瓷体经历腐蚀，在外围(暴露的)边附近的硬度降低，原因在于通过与熔解的硅酸盐玻璃反应而形成更软的相。腐蚀还可以通过掺入几百ppm含量的着色(标记物)例如氧化钴来测量，其在烧结体内形成蓝色铝酸钴。由于与硅酸盐相反应，腐蚀的深度可以通过观察铝酸钴蓝颜色的衰退而进行肉眼监测。此外，以及特别值得注意的是，腐蚀可以以腐蚀指数来量化，所述腐蚀指数由氧化铝研磨砂粒在1250℃下暴露于熔融二氧化硅玻璃4小时之后Si渗透的平均深度表示。本文的实施方式显示腐蚀指数不大于15微米，例如不大于10微米，或者甚至不大于8微米。
在表1和2中归纳了在实施例1-5中合成的陶瓷体的特征。表1-阐述了作为温度函数的晶畴增长的抵抗性，以微米报告
Figure G2007800465401D00081
在表1中的结果明确显示实施例1经历了作为温度函数的显著晶畴增长。含有各种数量阻塞剂的实施例降低了作为温度函数的晶粒生长的灵敏性，并且因此扩展了应用的有效温度范围。表2
Figure G2007800465401D00091
*实施例1掺杂按重量计0.08％的CoO，如在实施例5中描述。
表2阐述了氧化锆或氧化钇添加剂明显降低了具有玻璃的晶粒的反应性，如通过更好的硬度保持所证明。此外，使用添加剂例如ZrO2明显使SiO2侵蚀到晶粒中的渗透最小化，以及考虑到熔融玻璃而提供更稳定的晶粒。此外，明确地观察到，当氧化钴添加剂被用作颜色显示剂时，添加剂例如ZrO2被使用时的反应程度低得多，如通过蓝颜色的保持所显示。
根据本文的实施方式，提供了特别希望的精细微结构的高温粘结磨料构件。这样的精细微结构构件显著优于现有技术，其一般限于如在US 5,282,875所示例的中等微结构高温粘结磨料，US 5,282,875最多教导了具有600纳米晶畴和尺寸为350纳米及更大尺寸的α-氧化铝单晶的微结构(参考US 4,744,802，通过参考并入US 5,282,875中)。尽管精细-微结构的氧化铝研磨砂粒过去已经被用于自由磨料应用中，这样的精细微结构氧化铝研磨砂粒典型地还未用于高温粘结磨料应用的情况中。已经发现，这样的精细-微结构材料在加工期间溶解于在玻璃状粘结基质材料中和/或在与这样的高温粘结磨料相关的热处理期间经历过度的晶畴增长。这在上面描述的实施例1中明确地显示，其中初始精细微结构材料被显示经历过大的晶畴增长和过度的腐蚀。
尽管不希望被任何具体的理论所束缚，据认为，阻塞剂和过烧结研磨砂粒的联合应用产生高度稳定的砂粒，其在高温处理例如高温使用应用期间抵抗微结构变化。据认为，阻塞剂对通常在升高的温度下观察到的晶粒生长是有效的，而过烧结过程条件被认为赋予显著提高的抗-腐蚀特征并进一步增强阻塞剂的阻塞效果。如本文所描述的更高的烧结温度可以产生晶粒边界相，其通过该晶粒边界改变的结晶、或该晶粒边界体积的均匀分布和/或一定晶粒边界元素选择性溶解到基质中而对腐蚀抵抗性更强。该过-烧结条件还可以以将附加的腐蚀抵抗力作用到研磨砂粒中的方式协同地影响该阻塞剂。无论何种机理，所观察到的影响是明显的，因为根据本文实施方式的高温粘结磨料构件展示稳定的腐蚀特征。
进一步注意到，现有技术接种技术已经提到使用晶粒生长稳定剂——包括各种氧化物稳定剂，以及使用通常与烧结接种溶胶-凝胶氧化铝研磨砂粒有关的高于1300℃的烧结温度。但是，这样的晶粒生长抑制剂和烧结温度已经结合α-氧化铝材料的一般生产而被教导，并且相信这样的精细-微结构材料在高温粘结磨料构件的情况中也将经历过大的晶粒生长和/或过多的腐蚀。但是，惊奇地发现，该阻塞剂材料和过-烧结条件的结合不仅仅解决了高温粘结磨料加工和使用条件期间的晶畴增长的显著缺陷，而且具有抗腐蚀性。
尽管本发明的实施方式已经被示例以及被具体地描述，本发明不意欲限定于所显示的细节，因为可以做出各种修改和替代，而不以任何方式脱离本发明的范围。例如，可以提供附加的或等价的替代物以及可以应用附加的或等价的生产步骤。照此而言，本领域技术人员仅利用常规试验就可以想到本文所公开的本发明的另外的修改和等价物，并且所有这样的修改和等价物被认为是在由所附权利要求所限定的本发明范围中。

Claims (14)

1.高温粘结磨料构件，其包括：
氧化铝研磨砂粒；和
玻璃状粘结基质，该基质将各个氧化铝研磨砂粒相互粘结在一起，所述氧化铝研磨砂粒分布于所述玻璃状粘结基质中，所述玻璃状粘结基质具有不小于1000℃的固化温度，
其中所述氧化铝研磨砂粒包括多晶α-氧化铝，其具有由不大于500nm的α-氧化铝平均畴尺寸表征的精细晶体微结构，以及其中所述氧化铝研磨砂粒进一步包括具有不大于1微米的平均颗粒尺寸的阻塞剂，所述阻塞剂包括在多晶α-氧化铝中的分散相。
2.如权利要求1中所述的高温粘结磨料构件，其中所述阻塞剂是来自硅、硼、钛、锆、稀土元素之中至少一种元素的氧化物、其与多晶α-氧化铝的反应产物以及它们的组合。
3.如权利要求2中所述的高温粘结磨料构件，其中所述阻塞剂包括氧化锆。
4.如权利要求1中所述的高温粘结磨料构件，其中所述阻塞剂以不少于0.1wt％的量存在于所述氧化铝研磨砂粒中。
5.如权利要求4中所述的高温粘结磨料构件，其中所述阻塞剂在0.1到20wt％的范围内存在于所述氧化铝研磨砂粒中。
6.如权利要求1中所述的高温粘结磨料构件，其中所述氧化铝研磨砂粒具有不大于400纳米的平均晶畴尺寸。
7.如权利要求6中所述的高温粘结磨料构件，其中所述多晶α-氧化铝的晶畴是单晶体，并且具有不大于200纳米的平均晶畴尺寸。
8.如权利要求1中所述的高温粘结磨料构件，其中所述氧化铝研磨砂粒具有至少1400℃的晶体稳定性，其中晶体稳定性是所述氧化铝研磨砂粒在所述温度下暴露5分钟之后经历以不大于500nm平均畴尺寸量化的晶畴生长时的温度。
9.如权利要求1中所述的高温粘结磨料构件，其中所述氧化铝研磨砂粒具有不大于15μm的腐蚀指数，其中腐蚀指数是氧化铝研磨砂粒在1250℃下暴露于熔融二氧化硅玻璃4小时之后Si渗透的平均深度。
10.如权利要求1中所述的高温粘结磨料构件，其中所述玻璃状粘结基质具有不小于1100℃的固化温度。
11.如权利要求1中所述的高温粘结磨料构件，其中所述玻璃状粘结基质具有不小于1000℃的玻璃化转变温度Tg。
12.高温粘结磨料构件，其包括：
氧化铝研磨砂粒；和
玻璃状粘结基质，该基质将各个氧化铝研磨砂粒相互粘结在一起，所述氧化铝研磨砂粒分布于所述玻璃状粘结基质中，所述玻璃状粘结基质具有不小于1000℃的固化温度，
其中所述氧化铝研磨砂粒包括多晶α-氧化铝，其具有由不大于300nm的平均畴尺寸表征的精细晶体微结构，以及其中所述氧化铝研磨砂粒进一步包括具有不大于1微米的平均颗粒尺寸的阻塞剂，所述阻塞剂包括分散于所述多晶α-氧化铝中的氧化锆相。
13.形成高温粘结磨料构件的方法，包括：
通过在不小于1350℃的温度下热处理含有阻塞剂的α-氧化铝前体，形成精细晶体微结构α-氧化铝研磨砂粒；
与玻璃状粘结基质材料形成含有α-氧化铝砂粒的成型体，所述基质将各个氧化铝研磨砂粒相互粘结在一起；和
在固化温度下热处理所述成型体，所述固化温度不小于1000℃并且高于所述玻璃状粘结基质材料的熔点，在热处理之后，所述氧化铝研磨砂粒具有不大于300纳米的平均晶畴尺寸并且包括具有不大于1微米的平均颗粒尺寸的阻塞剂。
14.如权利要求13中所述的形成高温粘结磨料构件的方法，其中所述α-氧化铝前体在存在晶种的情况下被热处理。
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