本研究探討CBN砂輪之瓷質結合劑，選定以透輝石(CaMgSi2O6)玻璃陶瓷系統，因瓷質結合劑擁有可修整、剛性高、耐磨性佳、耐熱性大等特性；玻璃陶瓷具有高緻密性且可以低溫燒結之特性，而玻璃陶瓷中相結構與結晶度可藉由後處理控制，故本文以不同熱處理方法控制相成分比例，來提升物理特性；另外為了增加內部玻璃體的網絡結構，因此在內部添加TiO2，預期能夠得到具有高強度的玻璃陶瓷結合劑。
本實驗設計玻璃瓷質結合劑成分以Ca-Mg-Si-B(CMSB)為主，SiO2、B2O3為玻璃形成劑，而在B2O3添加至30%以上時可以有效的提升與CBN磨料的潤濕性；我們透過設計玻璃的修飾劑希望能夠增加結合劑的物理性質，例如：Mg、Ca、Ba等鹼土族元素，因為離子半徑大、電價高、鍵結能高，會與氧鍵結較鹼金族更穩定，使鍵結結構強度增加，材料的物理強度增加，熱膨脹係數隨著降低，因陶瓷體能夠有效增加玻璃體韌性，故實驗設計以莫耳成分比例透輝石相Ca ：Mg：Si=1：1：2之成分比例配製結合劑；另外本實驗再添加2~8mol%的TiO2融熔成最後的玻璃體，期望Ti4+在玻璃內部鍵結可以增加玻璃網絡緻密性，增加玻璃體物理強度，本實驗利用FT-IR在有添加TiO2可以發現內部有產生[TiO4]與[TiO6]鍵結，此兩種鍵結在玻璃體有較小的鍵結結構大小，能夠填補[SiO4]的鍵結空隙，得到緻密的玻璃網絡。
實驗中添加不同TiO2來控制玻璃體網絡的鍵結狀況，接著利用熱處理使內部產生透輝石相結晶體，以不同熱處理參數來控制玻璃體與陶瓷體的比例，由物理特性發現在CMSB熱處理760oC持溫5小時與800oC持溫2小時的表面硬度在4T時可達572.3 HV和592.1 HV，抗折強度為97.4 Mpa和98.5 Mpa，是為各玻璃陶瓷成分中的最高值，利用Rietveld method分析結晶相比為18%和44%，在更高持溫時間與更高溫層雖然有多的結晶透輝石相產生，但是在物理特性上並無明顯的增加，故在此時的玻璃網絡與結晶相提供結合劑最佳的物理特性。
另外由韌性上可以發現，在透輝石相較少的760oC持溫2hrs添加4%TiO2破裂韌性約0.073 MPa√m 結晶度約6%，在隨著熱處理時間和溫層的增加，發現到韌性會因為陶瓷體產生，破裂韌性大幅增加，在760oC持溫10小時4% TiO2添加其結晶度有82.7%，此時韌性值為0.177 MPa√m，可以明顯的發現到，破裂韌性會隨著透輝石相結晶度增加而大幅提升。
本研究開發出在瓷質結合劑中產生透輝石相CMSB4T有獨特的物理特性，由於鹼土元素提供比鹼金元素有優異的強度與熱膨脹係數，在控制內部的透輝石結晶相後也有效的提升韌性。

In this study, the glass-ceramic binding agent of cubic boron nitride (CBN) grinding wheel were developed and investigated. The Diopside (CaMgSi2O6) was selected to be used in glass-ceramic systems. This type of ceramic binders have high dressibility, high rigidity, high wear resistance, high heat resistance and other characteristics. Glass ceramics have high density and can be sintered at low-temperature. Furthermore, the glass-ceramic phase structure and crystallization degree can be controlled by post-treatment. Because of these reasons, this study uses different heat treatment methods to control the phase composition ratio, to improve the physical properties in order to increase the internal structure of the glass network, as a result TiO2 was added to obtain high strength glass ceramic binder.
This experiment was designed to use glass compositions with Ca-Mg-Si-B (CMSB) as the main components, and TiO2 as the modifier, in order to form ceramic binding agent. When more than 30% of B2O3 was added, we can effectively increase the CBN abrasive wetting property. Mg, Ca, Ba and other alkaline earth (AE) elements, possess larger ionic radius, higher electronic valence, higher bonding energy, and therefore oxide bonding is more stable than those in the alkali metal group. The covalent/ionic bonding of AE elements can increase structural strength, enhance physical properties of the glass and therefore decrease thermal expansion coefficient of glass. Therefore in this experimental we use Ca: Mg: Si = 1: 1: 2 ratio of ingredients to formulate the binder, and add 2 ~ 8 mol% of TiO2 into the final glass melt in order to produce Ti4+ bonds inside the glass to increase network density and to increase physical strength of the glass. FT-IR were also employed to investigate the glass, and TiO2 addition was found to generate [TiO4] and [TiO6] bonding in the glass, which increases network density, and physical strength of the glass phase.
TiO2 can also work as a nucleation agent in the experiment and therefore we perform heat treatments to make diopside crystal phase precipitate with different heat treatment parameters to control the ratio of glass-ceramic phases in CMSB glass. Heat treatment at 760oC for 5 hours and at 800oC for 2 hours of the CMSB4T specimens produce surface hardness of up to 572 HV and 592 HV, and bending strength of 97.4 Mpa and 98.5 Mpa. Analyzing the crystal phase using Rieveld method indicates 18% and 44% of formation of the diopside phase. Although longer holding time and higher annealing temperature generate more diopside crystal phase, no significant increase in hardness and bending strength, indicating an appropriate arrangement of the glass network and the amount of crystal phase provides optimum hardness and bending strength of the binding agent.
As to toughness of the CMSB4T glass ceramics, the material treated at 760oC, 2hrs with fewer diopside phase (6%) exhibit fracture toughness of about 0.073 MPa√m; on the other hand, the specimen treated at 760oC, 10 hrs with a crystallinity of 82.7% show a the fracture toughness of 0.177 MPa√m, implying that fracture toughness of the glass-ceramics increases with the amount of the diopside phase.
The current results show that a designed glass-ceramic system based upon alkaline-earth element provides better toughness, strength and thermal expansion than those with alkaline elements, which may work as a better CBN binding agent in grinding wheel applications.

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